Question

How to check if a string is all uppercase in C

Answer 1

#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>

bool isAllUpper(char* s) {

    for (int i = 0; s[i]; i++) {
        if (!isupper(s[i]))
            return false;
    }

    return true;

}

int main(void) {
    char s[] = "CPROGRAMMING";

    if (isAllUpper(s))
        puts("yes");
    else
        puts("no");

    return 0;
}




/*
run:

yes

*/

 

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