Factorial program using recurrsion returning wrong value

I am trying to calculate factorial using recursion but my program is retuing wrong value. I am unable to understand the recursion functionality. Please help me in understanding how recursion works. My code is as follows:

#include <stdio.h>
#include <math.h>

int main() {
//code
int T,N,sol;
scanf("%dn",&T);

  while(T--)
   {
    scanf("%dn",&N);

    sol=fact(N);
    printf("%dn",sol);

   }

retu 0;
 }

  int fact(int n)
 {
   int value;
   while(n>0)
   {
    value=n*fact(n-1);
    n=n-1;
   }
   retu value;
 }