C Tutorial
This c program is used to find the factorial value for any number.
Factorial of a Number = 1*2* .... (Number-1)*Number.
#include<stdio.h> void main() { int num, i=1, factorial = 1; printf("Enter number: "); scanf("%d",&num); if (num < 0) printf("Error - Negative Number."); else { while(i <= num) { factorial *= i; i++; } printf("Factorial of %d: %d", num, factorial); } }Output:
$ cc factorial.c $ ./a.out Enter number: 5 Factorial of 5: 120 $ vi factorial.c [$ ./a.out Enter number: -3 Error - Negative Number.
#includeOutput:void main() { int num, i=1, factorial = 1; printf("Enter number: "); scanf("%d",&num); if (num < 0) printf("Error - Negative Number."); else { for(i=1;i <= num;i++) { factorial *= i; } printf("Factorial of %d: %d", num, factorial); } }
$ cc factorial.c $ ./a.out Enter number: 4 Factorial of 4: 24
Recursive function is a function which calls itself.
#include <stdio.h> int factorial(int); void main() { int num, i=1, factorial_val = 1; printf("Enter number: "); scanf("%d",&num); if (num < 0) printf("Error - Negative Number."); else { factorial_val = factorial(num); printf("Factorial of %d: %d", num, factorial_val); } } int factorial(int num) { if(num > 1) return (num * factorial(num-1)); else return 1; }Output:
$ cc factorial.c $ ./a.out Enter number: 6 Factorial of 6: 720
C Tutorial
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