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#define _GNU_SOURCE
#include <ctype.h>
#include <stdio.h>
int main()
{
FILE *fi = fopen("INP.TXT", "r"), *fo = fopen("OUT.TXT", "w");
char c, prevc = 32;
while ((c = fgetc(fi)) != EOF) {
if (prevc ^ 32)
fputc(isupper(c) ? c + 32 : c, fo);
else if (c ^ 32)
fputc(islower(c)) ? c - 32 : c, fo);
prevc = c;
}
fcloseall();
return 0;
}
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