Factorial program in c: c code to find and print factorial of a number, three methods are given, first one uses a for loop, second uses a function to find factorial and third using recursion. Factorial is represented using !, so five factorial will be written as 5!, n factorial as n!. Also
n! = n*(n-1)*(n-2)*(n-3)...3.2.1 and zero factorial is defined as one i.e. 0!=1.
n! = n*(n-1)*(n-2)*(n-3)...3.2.1 and zero factorial is defined as one i.e. 0!=1.
Factorial program in c using for loop
: Here we find factorial using for loop.
#include<stdio.h>
#include<conio.h>
main()
{
int c, n, fact = 1;
printf("Enter a number to calculate it's factorial\n");
scanf("%d",&n);
for( c = 1 ; c <= n ; c++ )
fact = fact*c;
printf("Factorial of %d = %d\n",n,fact);
getch();
return 0;
}
Factorial program in c using function
#include<stdio.h>
long factorial(int);
main()
{
int number;
long fact = 1;
printf("Enter a number to calculate it's factorial\n");
scanf("%d",&number);
printf("%d! = %ld\n", number, factorial(number));
return 0;
}
long factorial(int n)
{
int c;
long result = 1;
for( c = 1 ; c <= n ; c++ )
result = result*c;
return ( result );
}
Factorial program in c using recursion
#include<stdio.h>
long factorial(int);
main()
{
int num;
long f;
printf("ENTER A NUMBER TO FIND FACTORIAL :");
scanf("%d",&num);
if(num<0)
printf("NEGATIVE NUMBERS ARE NOT ALLOWED");
else
{
f = factorial(num);
printf("%d!=%ld",num,f);
}
return(0);
}
long factorial(int n)
{
if(n==0)
return(1);
else
return(n*factorial(n-1));
}
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