# C Program to find GCD of N Numbers

## C Program to find GCD of N Numbers

```
#include<stdio.h>
int main()
{
printf("\n\n\t\tC Program for Greatest Common Divisor(GCD)\n\n\n");
int x, y =- 1;
printf("Enter numbers. To exit enter 0\n");
while(1) // infinite loop to take input
{
scanf("%d", &x);
if(x < 1)
break;
else if(y ==- 1) // only 1 number entered, its GCD is itself
y = x;
else if(x < y)
y = gcd(x, y);
else
y = gcd(y, x);
}
printf("\n\n\nGCD of all the entered number is: %d", y);
return 0;
}
// GCD of 2 numbers is calculated at a time
int gcd(int a, int b)
{
int i;
/*
a is the smallest of the two numbers
of which GCD is to be calculated
*/
for(i = a; i >= 1; i--)
{
// Greatest number that divides both the numbers
if(a%i == 0 && b%i == 0)
break; // exits the loop
}
return i;
}
```