Question

What is the difference between variable == value and value == variable in C

Answer 1

#include <stdio.h>

int main()
{
    int x = 8;

    if (x == 5) {
        puts("x == 5");
    }
    else {
        puts("x != 5");
    }

    if (x = 5) { // Error - Compiler say nothing, x set to 5
        puts("x == 5");
    }
    else {
        puts("x != 5");
    }

    /*if (5 = x) { // Error - Compiler say: error C2106: '=': left operand must be l-value
        puts("x == 5");
    }
    else {
        puts("x != 5");
    }*/

    if (5 == x) {
        puts("x == 5");
    }
    else {
        puts("x != 5");
    }

    return 0;
}



/*
run:

x != 5
x == 5
x == 5

*/

 

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