C Academy · Lesson

Relational and Logical

Comparisons and &&, ||.

Comparing Values

Relational operators compare two values and produce a truth value: 1 for true and 0 for false.

#include <stdio.h>
int main(void) {
    printf("3 < 5 = %d\n", 3 < 5);
    printf("3 > 5 = %d\n", 3 > 5);
    return 0;
}

Use == to test equality and != to test inequality. Do not confuse == with the assignment operator =.

#include <stdio.h>
int main(void) {
    int a = 4, b = 4;
    printf("a == b = %d\n", a == b);
    printf("a != b = %d\n", a != b);
    return 0;
}