c check if char is an operator

#include <stdio.h>

int isOperator(char c) {
    if (c == '+' || c == '-' || c == '*' || c == '/' || c == '%') {
        return 1;
    }
    return 0;
}

int main() {
    char input;

    printf("Enter a character: ");
    scanf(" %c", &input);

    if (isOperator(input)) {
        printf("%c is an operator.\n", input);
    } else {
        printf("%c is not an operator.\n", input);
    }

    return 0;
}