Recursion

Recursion Program in C

Factorial program in c using recursion:

Recursion is a technique in which a function calls itself, for example in above code factorial function is calling itself.

#include

long factorial(int);

int main()
{
int n;
long f;

printf(“Enter an integer to find factorial\n”);
scanf(“%d”, &n);

if (n < 0)
printf(“Negative integers are not allowed.\n”);
else
{
f = factorial(n);
printf(“%d! = %ld\n”, n, f);
}
return 0;
}

long factorial(int n)
{
if (n == 0)
return 1;
else
return(n * factorial(n-1));
}

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