09/07/07 18:02:11
>>732
#include <stdio.h>
#include <ctype.h>
int main(void)
{
char str[128];
int i;
scanf("%s", str);
for (i = 0; str[i]; ++i)
if (isupper(str[i])) str[i] = tolower(str[i]);
else if (islower(str[i])) str[i] = toupper(str[i]);
puts(str);
return 0;
}