Question

While trying to do the GCD and LCM program from programming simplified…I am facing problems with the results. I did everything correct(according to me) and even checked word by word but the problem still persists…I am pasting the code of normal method only.

#include <stdio.h>

int main()
{
    int a, b, x, y, t, gcd, lcm;
  
    printf("Enter first number :");
    scanf("%d", &a);
    printf("Enter first number :");
    scanf("%d", &b);
  
    a = x;
    b = y;
  
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
  
    gcd = a;
    lcm = (x * y)/gcd;
  
    printf("Greatest common divisior of %d and %d = %d\n", x, y, gcd);
    printf("Lowest common divisior of %d and %d = %d\n", x, y, lcm);
  
    getch();    
}

Answer 1

At least this part is fundamentally wrong:

int a, b, x, y, t, gcd, lcm;

printf("Enter first number :");
scanf("%d", &a);
printf("Enter first number :");
scanf("%d", &b);

a = x;
b = y;

So you’re declaring x and y uninitialized, then you’re assigning them to a and b – now a and b don’t contain the values the user entered, but some garbage. You probably want

x = a;
y = b;

instead.