PROGRAM-1:
GCD using for loop and if statement
#include <stdio.h>
int main()
{
int n1, n2, i, gcd;
printf("Enter two integers: ");
scanf("%d %d", &n1, &n2);
for(i=1; i <= n1 && i <= n2; ++i)
{
if(n1%i==0 && n2%i==0)
gcd = i;
}
printf("G.C.D of %d and %d is %d", n1, n2, gcd);
return 0;
}
PROGRAM-2:
GCD using while loop and if...else statement
#include <stdio.h>
int main()
{
int n1, n2;
printf("Enter two positive integers: ");
scanf("%d %d",&n1,&n2);
while(n1!=n2)
{
if(n1 > n2)
n1 -= n2;
else
n2 -= n1;
}
printf("GCD = %d",n1);
return 0;
}
OUTPUT:
Enter two positive integers: 81
153
GCD = 9
PROGRAM-3:
GCD for both positive and negative numbers
#include <stdio.h>
int main()
{
int n1, n2;
printf("Enter two integers: ");
scanf("%d %d",&n1,&n2);
n1 = ( n1 > 0) ? n1 : -n1;
n2 = ( n2 > 0) ? n2 : -n2;
while(n1!=n2)
{
if(n1 > n2)
n1 -= n2;
else
n2 -= n1;
}
printf("GCD = %d",n1);
return 0;
}
OUTPUT:
Enter two integers: 81
-153
GCD = 9
