Program to find factorial of a number in c using function

C program to find factorial of a number using function

#include<stdio.h>

#include<stdio.h>

void fact(int);

main()

{

int n;

printf("\n Enter the number to be find factorial");

scanf("%d",&n);

fact(n);

}

void fact(int n)

{

int i, f=1;

for(i=1;i<=n;i++)

{

f=f*i;

}

printf("\n Factorial of %d = %d",n,f);

}

 Output

How factorial is calculated 

Factorial of number is calculated by 

n*(n-1)*(n-2)*(n-3)....…..........................1

For example factorial 5 is

5*(5-1)*(5-2)*(5-3)*(5-4)

5*4*3*2*1

120

Here in program 

User have to enter number to be find factorial the value is store in the variable n.

void fact(int); 

It is a Function prototype 

fact(n);

It is a Function call

 And, 

for(i=1;i<=n;i++)

The loop is continuous from 1 to n

f=f*i

It multiply number as 

1*(n-1)*(n-2)*(n-3)............n 

printf("\n factorial of %d = %d",n,f);

The part helps to print value of f which is factorial of n

Also, check

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