Write a C program to Print factorial of a number. In this program, We are going to write a C program which takes an input number and print it's factorial.
To solve this problem, we are using iterative approach. If you are not familiar with iterative and recursive approach then you can check this awesome tutorial on recursion vs iteration.
Difference between iteration and recursion
Java program to print factorial of a number
What is Factorial?
For any input number n, it's factorial isfactorial = 1 * 2 * 3 * 4 .......n;
Suppose, An input number is 4 then it's factorial is 4 * 3 * 2* 1 = 24
C Program to Print Factorial of a Number using Loop
In this program, we take a input number and using for loop our program calculate and print the factorial of a number.
#include<stdio.h>
int main()
{
int number, fact=1, i;
printf("Enter a number \n ");
scanf("%d",&number);
//If a number is greater than zero
if(number > 0) {
for(i = 1; i <= number; i++){
fact = fact*i;
}
printf("The factorial of a number is: %d",fact);
} else if (number == 0 ){
printf("Factorial of 0 is 1");
} else {
printf("Factorial of negative number doesn't exist";
}
return 0;
}
C Program to Print Factorial of a Number using Function
#include <stdio.h>
//This method calculate and return factorial
int factorial(int num) {
int fact = 1;
//Factorial of a zero is zero
if (num == 0) {
return 1;
}
for (int i = 1; i <= num; i++) {
fact = fact*i;
}
return fact;
}
int main(void) {
int num;
printf ("Enter a number \n");
scanf ("%d", &num);
if (num >= 0) {
//Function is called factorial(num)
printf ("Factorial of a number is %d", factorial(num));
} else {
printf ("Factorial of a negative number doesn't exist");
}
return 0;
}
Output -
Enter a number 5
Factorial of a number is 120
Print factorial of a number using recursion
No comments:
Post a Comment