Below is the program to find factorial of a number using function in C language. The program has been compiled and executed in Dev C++. The function is a block of code that is specifically designed to do a certain task. Here, the function is taking an argument and calculating the factorial returning its resulting value. Function may or may not return a value explicitly. But it will always return an exit code depending on execution.
CODE:
#include<stdio.h>
void main(){
int a,f;
int fact(int);
printf("Enter a number:");
scanf("%d",&a);
f=fact(a);
printf("Factorial= %d", f);
getch();
}
//function fact taking an integer argument to calculate it's factorial.
int fact(int x)
{
int fac=1,i;
for(i=x;i>=1;i--){
fac=fac*i;
}
return fac; // returning the fact value.
}
OUTPUT:
