#include <stdio.h>
void char_register(char * ch, int fl){
if(fl == 1){
if ('a' <= *ch && *ch <= 'z')
*ch += ('A' - 'a');
}
if(fl == 0){
if ('A' <= *ch && *ch <= 'Z')
*ch += ('a' - 'A');
}
}
int main(void) {
char c;
int fl;
char_register(&c, fl);
}
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