getting statement not reached at z=s;

[iitanil]

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double mycos(double x,double err)
{
double i,r,c,z,s,t,a,n;
s=1;c=2*n;n=1;
while(2>1){
{for(i=1,a=1;i<=c;++i){a=a*i;}}
t=pow(-1,n)*(pow(x,c)/a);
s=s+t;
++n;
}
z=(s);return (z);
}
int main()
{
double err,x,a,r,c,t,i,z;
printf("give x");
scanf("%lf",&x);
z=mycos(x,err);
printf("%lf",z);
}

[weaknessforcats]

This code:

while(2>1){
 {for(i=1,a=1;i<=c;++i){a=a*i;}}
 t=pow(-1,n)*(pow(x,c)/a);
etc...

2 is always greater then 1. You never leave the while loop.