#include <stdio.h>
void swapls(char* line)
{
while(*line != '\0')
{
if(*line >= 65 && *line <= 90)
*line += 32;
else
if(*line >= 97 && *line <= 122)
*line -= 32;
++line;
}
}
int main()
{
char line[24] = "foo-32_BAR+64(bald)\0";
printf("%s\n", line);
swapls(&line[0]);
printf("%s\n", line);
return 0;
}