7) Write a C++ program that finds and display factorial value of given number using function.

 source file name: factfn.cpp

#include<iostream.h>

#include<conio.h>

int main()

{

void fact(int);

int n;

clrscr();

      cout<<" enter any no:";

      cin>>n;

      fact(n);

      getch();

 return 0;

}

void fact(int n)

{

int f=1;

for(;n>0;n--)

f=f*n;

cout<<"\n factorial value: "<<f;

}

output: