diff options
Diffstat (limited to 'usth/ICT2.1/labwork/4/Ex3.c')
-rw-r--r-- | usth/ICT2.1/labwork/4/Ex3.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/usth/ICT2.1/labwork/4/Ex3.c b/usth/ICT2.1/labwork/4/Ex3.c new file mode 100644 index 0000000..ba016fc --- /dev/null +++ b/usth/ICT2.1/labwork/4/Ex3.c @@ -0,0 +1,32 @@ +/* + * Read numbers from stdin to a link list and print their sum to stdout. + * This is free and unencumbered software released into the public domain. + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "construct.h" + +construct *readoubles() +{ + double *x = malloc(sizeof(double)); + if (scanf("%lf", x) != EOF) + return cons(x, readoubles()); + free(x); + return NULL; +} + +double sum(construct *list) +{ + if (list == NULL) + return 0.0; + /* At program termination the memory will be freed anyway. */ + return *(double *) car(list) + sum(cdr(list)); +} + +int main() +{ + printf("%g\n", sum(readoubles())); + return 0; +} |