Can someone diagnose the print issue?

[alpinanazawsze]

Why does the "Binary: " always print "Binary: 0"?

#include <math.h>
#include <stdio.h>
int main(void) {
    int x;
    int y = 0, i = 0;
    int z;


    printf("Enter a binary number: ");
    scanf("%d", &x);
    if (x < 0) {
        printf("Invalid");
    }
    while (x > 0) {
        z = x % 10;
        y = y + z * pow(2, i);
        i++;
        x = x / 10;
    }
    printf("Binary: %d\n", x);
    printf("Decimal: %d\n", y);
    return 0;
}

[laserlight]

Because the only way for the loop to terminate is when x <= 0, and since x never becomes negative, it means that x is always 0 at the termination of the loop. If you want to retain the original value, you need to save it somewhere before the loop.