What is the difference between = and == in C?

= is the assignment operator. It stores a value. == is the equality operator. It compares two values and gives 1 or 0.

#include <stdio.h>

int main(void) {
    int x = 5;

    if (x == 10) printf("equal\n");   // false, nothing printed
    if (x = 10) printf("assigned\n"); // assigns 10, always true
    printf("x = %d\n", x);
    return 0;
}

Output:

The second if changed x to 10 by mistake. See C Operators.

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