[lang] Reorganize language learning archive

32 files changed, 677 insertions, 0 deletions

diff --git a/lang/mips/chapter-2/exercise-1/a.s b/lang/mips/chapter-2/exercise-1/a.s
new file mode 100644
index 0000000..4da4645
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/a.s
@@ -0,0 +1,20 @@
+# t3 = t4 + t5 - t6
+	.text
+main:
+	li	$t4,	4		# t4 = 4
+	li	$t5,	5		# t5 = 5
+	li	$t6,	6		# t6 = 6
+
+	add	$t3,	$t4,	$t5	# t3 = t4 + t5
+	sub	$t3,	$t3,	$t6	# t3 -= t6
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t3		# at t3
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/b.s b/lang/mips/chapter-2/exercise-1/b.s
new file mode 100644
index 0000000..fa590b5
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/b.s
@@ -0,0 +1,19 @@
+# s3 = t2 / (s1 - 54321)
+	.text
+main:
+	li	$t2,	69		# t2 = 69
+	li	$s1,	54324		# s1 = 54324
+
+	sub	$s1,	$s1,	54321	# s1 -= 54321
+	div	$t3,	$t2,	$s1	# t3 = t2 / s1
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t3		# at a0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/c.s b/lang/mips/chapter-2/exercise-1/c.s
new file mode 100644
index 0000000..370af96
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/c.s
@@ -0,0 +1,15 @@
+# sp -= 16
+	.text
+main:
+	addi	$sp,	$sp,	-16	# sp -= 16, may underflow
+
+	li	$v0,	1		# print integer
+	move	$a0,	$sp		# at sp
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/d.s b/lang/mips/chapter-2/exercise-1/d.s
new file mode 100644
index 0000000..e20cd4c
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/d.s
@@ -0,0 +1,13 @@
+# print t3
+	.text
+main:
+	li	$v0,	1		# print integer
+	move	$a0,	$t3		# at t3
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/e.s b/lang/mips/chapter-2/exercise-1/e.s
new file mode 100644
index 0000000..d35702d
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/e.s
@@ -0,0 +1,18 @@
+# read to and echo t0
+	.text
+main:
+	li	$v0,	5		# read integer to v0
+	syscall
+
+	move	$t0,	$v0		# t0 = v0
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/f.s b/lang/mips/chapter-2/exercise-1/f.s
new file mode 100644
index 0000000..2ec14ef
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/f.s
@@ -0,0 +1,17 @@
+# a0 = array
+	.data
+array:	.word	4, 20, 6, 9
+
+	.text
+main:
+
+	li	$v0,	1		# print integer
+	la	$a0,	array		# address of array
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/g.s b/lang/mips/chapter-2/exercise-1/g.s
new file mode 100644
index 0000000..e9d8f8f
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/g.s
@@ -0,0 +1,19 @@
+# t8 = *a0
+	.data
+array:	.word	4, 20, 6, 9
+
+	.text
+main:
+	la	$a0,	array		# a0 = array
+	lw	$t8,	($a0)		# t8 = *a0
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t8		# at t8
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/h.s b/lang/mips/chapter-2/exercise-1/h.s
new file mode 100644
index 0000000..eaf63bd
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/h.s
@@ -0,0 +1,20 @@
+# a0[4] = 32768
+	.data
+array:	.word	4, 2, 0, 6, 9
+
+	.text
+main:
+	la	$a0,	array		# t0 = array
+	li	$t1,	32768		# t1 = 32768
+	sw	$t1,	16($a0)		# t0[4] = t1
+
+	li	$v0,	1		# print integer
+	lw	$a0,	16($a0)		# at t0[4]
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/i.s b/lang/mips/chapter-2/exercise-1/i.s
new file mode 100644
index 0000000..8754525
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/i.s
@@ -0,0 +1,12 @@
+# print Hello, World!
+	.data
+hello:	.asciiz "Hello, World!\n"
+
+	.text
+main:
+	li	$v0,	4		# print string
+	la	$a0,	hello		# hello
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/j.s b/lang/mips/chapter-2/exercise-1/j.s
new file mode 100644
index 0000000..95eccc7
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/j.s
@@ -0,0 +1,16 @@
+# t7 = abs(t0)
+	.text
+main:
+	li	$t0,	-420		# t0 = -420
+	abs	$t7,	$t0		# t7 = abs(t0)
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t7		# at t7
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/k.s b/lang/mips/chapter-2/exercise-1/k.s
new file mode 100644
index 0000000..60c0038
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/k.s
@@ -0,0 +1,28 @@
+# while (t0) { s1 += t0; t0 = *++t2; }
+	.data
+array:	.word	4, 2, 0, 6, 9
+
+	.text
+main:
+	la	$t2,	array		# t2 = array
+	lw	$t0,	($t2)		# t0 = *t2
+	li	$s1,	0		# s1 = 0
+
+while:
+	beqz	$t0,	end		# if (!t0) goto end
+	add	$s1,	$s1,	$t0	# s1 += t0
+	addi	$t2,	$t2,	4	# t2++
+	lw	$t0,	($t2)		# t0 = *t2
+	j	while			# goto while
+end:
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s1		# at s1
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/l.s b/lang/mips/chapter-2/exercise-1/l.s
new file mode 100644
index 0000000..73b999d
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/l.s
@@ -0,0 +1,22 @@
+# for (t1 = 99; t1 > 0; v0 += t1--)
+	.text
+main:
+	li	$v0,	0		# v0 = 0
+	li	$t1,	99		# t1 = 99
+for:
+	blez	$t1,	end		# if (t1 <= 0) goto end
+	add	$v0,	$v0,	$t1	# v0 += t1
+	addi	$t1,	$t1,	-1	# t1--
+	j	for			# goto for
+end:
+
+	move	$a0,	$v0		# a0 = v0
+	li	$v0,	1		# print integer at a0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/m.s b/lang/mips/chapter-2/exercise-1/m.s
new file mode 100644
index 0000000..e02f924
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/m.s
@@ -0,0 +1,17 @@
+# t0 = 0x7fffffff - 0x80000000
+	.text
+main:
+	li	$t2,	-0x80000000	# t2 = 0x80000000
+	li	$t1,	0x7fffffff	# t1 = 0x7fffffff
+	add	$t0,	$t1,	$t2	# t0 = t1 - t2
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/n.s b/lang/mips/chapter-2/exercise-1/n.s
new file mode 100644
index 0000000..4394ebf
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/n.s
@@ -0,0 +1,16 @@
+# s0 *= -1
+	.text
+main:
+	li	$s0,	420		# s0 = 420
+	neg	$s0,	$s0		# s0 = -s0
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s0		# at s0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/o.s b/lang/mips/chapter-2/exercise-1/o.s
new file mode 100644
index 0000000..06dfc5c
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/o.s
@@ -0,0 +1,17 @@
+# s1 *= a0
+	.text
+main:
+	li	$s1,	420		# s1 = 420
+	li	$a0,	69		# a0 = 69
+	mul	$s1,	$s1,	$a0	# s1 *= a0
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s1		# at s1
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/p.s b/lang/mips/chapter-2/exercise-1/p.s
new file mode 100644
index 0000000..a15958f
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/p.s
@@ -0,0 +1,21 @@
+# s2 = srt(s0**2 + 56) / a3
+	.text
+main:
+	li	$s0,	420		# s0 = 420
+	li	$a3,	69		# a3 = 69
+
+	mul	$t0,	$s0,	$s0	# t0 = s0 ** 2
+	addi	$a0,	$t0,	56	# a0 = t0 + 56
+	jal	srt			# v0 = srt(a0)	# srt is undefined
+	div	$s2,	$v0,	$a3	# s2 = v0 / a3
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s0		# at s2
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/q.s b/lang/mips/chapter-2/exercise-1/q.s
new file mode 100644
index 0000000..47069cd
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/q.s
@@ -0,0 +1,20 @@
+# s3 = s1 - s2 / s3
+	.text
+main:
+	li	$s1,	69		# s1 = 69
+	li	$s2,	20		# s2 = 20
+	li	$s3,	4		# s3 = 4
+
+	div	$s3,	$s2,	$s3	# s3 = s2 / s3
+	sub	$s3,	$s1,	$s3	# s3 = s1 - s3
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s3		# at s3
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/r.s b/lang/mips/chapter-2/exercise-1/r.s
new file mode 100644
index 0000000..c362e64
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/r.s
@@ -0,0 +1,16 @@
+# s4 <<= 3
+	.text
+main:
+	li	$s4,	420		# s4 = 420
+	sll	$s4,	$s4,	3	# s4 <<= 3
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s4		# at s4
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-1/s.s b/lang/mips/chapter-2/exercise-1/s.s
new file mode 100644
index 0000000..07c8a12
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-1/s.s
@@ -0,0 +1,16 @@
+# s5 *= pi
+	.text
+main:
+	li	$s5,	420		# s5 = 420
+	mul	$s5,	$s5,	3	# s5 *= 3
+
+	li	$v0,	1		# print integer
+	move	$a0,	$s5		# at s5
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate program run
+	syscall
diff --git a/lang/mips/chapter-2/exercise-3.s b/lang/mips/chapter-2/exercise-3.s
new file mode 100644
index 0000000..d82da72
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-3.s
@@ -0,0 +1,22 @@
+# t0 = (s1 - s0 / s2) * s4
+	.text
+main:
+	li	$s1,	4		# s1 = 4
+	li	$s0,	20		# s0 = 20
+	li	$s2,	6		# s2 = 6
+	li	$s4,	9		# s4 = 9
+
+	div	$t0,	$s0,	$s2	# t0 = s0 / s2
+	sub	$t0,	$s1,	$t0	# t0 = s1 - t0
+	mul	$t0,	$t0,	$s4	# t0 *= s4
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-2/exercise-5.s b/lang/mips/chapter-2/exercise-5.s
new file mode 100644
index 0000000..ffb4058
--- /dev/null
+++ b/lang/mips/chapter-2/exercise-5.s
@@ -0,0 +1,22 @@
+# t0 = s0/8 - s1*2 + s2
+	.text
+main:
+	li	$s0,	69		# s0 = 20
+	li	$s1,	4		# s1 = 4
+	li	$s2,	20		# s2 = 20
+
+	sra	$t0,	$s0,	3	# t0 = s0 >> 3
+	sll	$t1,	$s1,	1	# t1 = s1 << 1
+	sub	$t0,	$t0,	$t1	# t0 -= t1
+	add	$t0,	$t0,	$s2	# t0 += s2
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-10.s b/lang/mips/chapter-3/exercise-10.s
new file mode 100644
index 0000000..f3ddeef
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-10.s
@@ -0,0 +1,41 @@
+# print -35 in 8-bit two-complement binary
+	.text
+main:
+	li	$t0,	-35		# t0 = -35
+	li	$t1,	0		# t1 = 0
+	li	$t8,	8		# t8 = 8
+
+reverse:
+	beqz	$t8,	prefix		# if (!t8) goto prefix
+	andi	$t2,	$t0,	1	# t2 = t0 & 1
+	sra	$t0,	$t0,	1	# t0 >>= 1
+	sll	$t1,	$t1,	1	# t1 <<= 1
+	add	$t1,	$t1,	$t2	# t1 += t2
+	addi	$t8,	$t8,	-1	# t8--
+	j	reverse			# goto reverse
+
+prefix:
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	li	$v0,	11		# print character
+	li	$a0,	98		# b
+	syscall
+	li	$t8,	8		# t8 = 8
+
+print:
+	beqz	$t8,	end		# if (!t8) goto end
+	li	$v0,	1		# print integre
+	andi	$a0,	$t1,	1	# a0 = t1 & 1
+	syscall
+	sra	$t1,	$t1,	1	# t1 >>= 1
+	addi	$t8,	$t8,	-1	# t8--
+	j	print			# goto print
+
+end:
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-11.s b/lang/mips/chapter-3/exercise-11.s
new file mode 100644
index 0000000..f47f29f
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-11.s
@@ -0,0 +1,41 @@
+# print -32 in 8-bit two-complement binary
+	.text
+main:
+	li	$t0,	-32		# t0 = -32
+	li	$t1,	0		# t1 = 0
+	li	$t8,	8		# t8 = 8
+
+reverse:
+	beqz	$t8,	prefix		# if (!t8) goto prefix
+	andi	$t2,	$t0,	1	# t2 = t0 & 1
+	sra	$t0,	$t0,	1	# t0 >>= 1
+	sll	$t1,	$t1,	1	# t1 <<= 1
+	add	$t1,	$t1,	$t2	# t1 += t2
+	addi	$t8,	$t8,	-1	# t8--
+	j	reverse			# goto reverse
+
+prefix:
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	li	$v0,	11		# print character
+	li	$a0,	98		# b
+	syscall
+	li	$t8,	8		# t8 = 8
+
+print:
+	beqz	$t8,	end		# if (!t8) goto end
+	li	$v0,	1		# print integre
+	andi	$a0,	$t1,	1	# a0 = t1 & 1
+	syscall
+	sra	$t1,	$t1,	1	# t1 >>= 1
+	addi	$t8,	$t8,	-1	# t8--
+	j	print			# goto print
+
+end:
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-13.s b/lang/mips/chapter-3/exercise-13.s
new file mode 100644
index 0000000..6779d11
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-13.s
@@ -0,0 +1,18 @@
+# print(int('204', 8))
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	2	# t0 += 2
+	sll	$t0,	$t0,	6	# t0 *= 8 * 8
+	addi	$t0,	$t0,	4	# t0 += 4
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-14.s b/lang/mips/chapter-3/exercise-14.s
new file mode 100644
index 0000000..b01b76b
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-14.s
@@ -0,0 +1,19 @@
+# print(int('204', 7))
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	2	# t0 += 2
+	li	$t1,	49		# t1 = 7 * 7
+	mul	$t0,	$t0,	$t1	# t0 *= t1
+	addi	$t0,	$t0,	4	# t0 += 4
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-15.s b/lang/mips/chapter-3/exercise-15.s
new file mode 100644
index 0000000..3a16b14
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-15.s
@@ -0,0 +1,19 @@
+# print(int('204', 6))
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	2	# t0 += 2
+	li	$t1,	36		# t1 = 6 * 6
+	mul	$t0,	$t0,	$t1	# t0 *= t1
+	addi	$t0,	$t0,	4	# t0 += 4
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-16.s b/lang/mips/chapter-3/exercise-16.s
new file mode 100644
index 0000000..1aa9dec
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-16.s
@@ -0,0 +1,19 @@
+# print(int('204', 5))
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	2	# t0 += 2
+	li	$t1,	25		# t1 = 5 * 5
+	mul	$t0,	$t0,	$t1	# t0 *= t1
+	addi	$t0,	$t0,	4	# t0 += 4
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-3.s b/lang/mips/chapter-3/exercise-3.s
new file mode 100644
index 0000000..cb2475c
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-3.s
@@ -0,0 +1,20 @@
+# t0 = 0b10101, using only bit shift and add
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	1	# t0++
+	sll	$t0,	$t0,	2	# t0 <<= 2
+	addi	$t0,	$t0,	1	# t0++
+	sll	$t0,	$t0,	2	# t0 <<= 2
+	addi	$t0,	$t0,	1	# t0++
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-4.s b/lang/mips/chapter-3/exercise-4.s
new file mode 100644
index 0000000..29888f1
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-4.s
@@ -0,0 +1,20 @@
+# t0 = 0b11001, using only bit shift and add
+	.text
+main:
+	li	$t0,	0		# t0 = 0
+	addi	$t0,	$t0,	1	# t0++
+	sll	$t0,	$t0,	1	# t0 <<= 1
+	addi	$t0,	$t0,	1	# t0++
+	sll	$t0,	$t0,	3	# t0 <<= 3
+	addi	$t0,	$t0,	1	# t0++
+
+	li	$v0,	1		# print integer
+	move	$a0,	$t0		# at t0
+	syscall
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-6.s b/lang/mips/chapter-3/exercise-6.s
new file mode 100644
index 0000000..8c1b6fd
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-6.s
@@ -0,0 +1,47 @@
+# print(hex(0b10101))
+	.text
+main:
+	li	$t0,	21		# t0 = 0b10101
+	li	$t1,	0		# t1 = 0
+	li	$t9,	9		# t9 = 9
+
+reverse:
+	beqz	$t0,	done		# if (!t0) goto done
+	andi	$t2,	$t0,	0xf	# t2 = t0 & 0xf
+	sra	$t0,	$t0,	4	# t0 >>= 4
+	sll	$t1,	$t1,	4	# t1 <<= 4
+	add	$t1,	$t1,	$t2	# t1 += t2
+	j	reverse			# goto reverse
+done:
+
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	li	$v0,	11		# print character
+	li	$a0,	120		# x
+	syscall
+	bnez	$t1,	print		# if (!t1) goto print
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	j	end			# goto end
+
+print:
+	beqz	$t1,	end		# if (!t1) goto end
+	andi	$t2,	$t1,	0xf	# t2 = t1 & 0xf
+	sra	$t1,	$t1,	4	# t1 >>= 4
+	addi	$a0,	$t2,	48	# a0 = chr(t2), sort of
+	ble	$t2,	$t9,	put	# if (t2 <= 9) goto put
+	addi	$a0,	$a0,	7	# a0 += 7
+put:
+	li	$v0,	11		# print character at a0
+	syscall
+	j	print			# goto print
+end:
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/chapter-3/exercise-7.s b/lang/mips/chapter-3/exercise-7.s
new file mode 100644
index 0000000..924765d
--- /dev/null
+++ b/lang/mips/chapter-3/exercise-7.s
@@ -0,0 +1,47 @@
+# print(hex(0b11001))
+	.text
+main:
+	li	$t0,	25		# t0 = 0b11001
+	li	$t1,	0		# t1 = 0
+	li	$t9,	9		# t9 = 9
+
+reverse:
+	beqz	$t0,	done		# if (!t0) goto done
+	andi	$t2,	$t0,	0xf	# t2 = t0 & 0xf
+	sra	$t0,	$t0,	4	# t0 >>= 4
+	sll	$t1,	$t1,	4	# t1 <<= 4
+	add	$t1,	$t1,	$t2	# t1 += t2
+	j	reverse			# goto reverse
+done:
+
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	li	$v0,	11		# print character
+	li	$a0,	120		# x
+	syscall
+	bnez	$t1,	print		# if (!t1) goto print
+	li	$v0,	11		# print character
+	li	$a0,	48		# 0
+	syscall
+	j	end			# goto end
+
+print:
+	beqz	$t1,	end		# if (!t1) goto end
+	andi	$t2,	$t1,	0xf	# t2 = t1 & 0xf
+	sra	$t1,	$t1,	4	# t1 >>= 4
+	addi	$a0,	$t2,	48	# a0 = chr(t2), sort of
+	ble	$t2,	$t9,	put	# if (t2 <= 9) goto put
+	addi	$a0,	$a0,	7	# a0 += 7
+put:
+	li	$v0,	11		# print character at a0
+	syscall
+	j	print			# goto print
+end:
+
+	li	$v0,	11		# print character
+	li	$a0,	10		# newline
+	syscall
+
+	li	$v0,	10		# terminate
+	syscall
diff --git a/lang/mips/mips.pdf b/lang/mips/mips.pdf
new file mode 100644
index 0000000..4a38047
--- /dev/null
+++ b/lang/mips/mips.pdf
Binary files differ