function gcd(a,b)
    x=a;
    y=b;
    while y~=0
        r=modulo(x,y)
        x=y;
        y=r;
    end
    printf("GCD(%d,%d)=%d",a,b,x)
endfunction
n1=input("Enter 1st number:")
n2=input("Enter 2nd number:")
gcd(n1,n2)