Write a program to find factorial of a number using recursion
Write a program to find factorial of a number using recursion
C program to find factorial of a number using recursion
In this program, you will learn to find the factorial of a non-negative integer entered by the user using recursion.
The factorial of a positive number n is given by:
factorial of n(n!)=1*2*3*4*....*n
The factorial of a negative number doesn't exist. And the factorial of 0 is 1.
- Program:
#include<stdio.h>int fact(int);int main(){int num;printf("Enter a positive integer: ");scanf("%d",&num);printf("Factorial of %d = %ld", num, fact(num));return 0;}int fact(int num){if (num)return (num*fact(num-1));elsereturn 1;}
- Output:
Enter a positive integer: 6 Factorial of 6 = 720
- Explain:
Suppose the user entered 6.
Initially, fact() is called from main() with 6 passed as an argument.
Then, 5 is passed to fact() from the same function (recursive call). In each recursive call, the value of argument n is decreased by 1.
When the value of n is less than 1, there is no recursive call and the factorial is returned ultimately to the main() function.
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