program to find factorial value of a number using function.

using codeblocks
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//program to find factorial value of a number using function.

#include<stdio.h>                      //header file

void factorial();                          // function prototype/declaration with return type zero.

int main()                              //main function

{

factorial();                                     // function calling.

return 0;                                       //returns 0 value

}

void factorial()                             // function body line ; also called function definition

{

 int i,n,facto=1;                    // variable declaration with 1 initialization

printf("enter a number\n");    //message display to input a number

scanf("%d",&n);                //gets input

for(i=1;i<=n;i++)       //loop running from 1 to n with increment 1 each time

{

       facto=facto*i;        //  multiplication of numbers repetitively

}

  

  printf("factorial value=%d\n",facto);    //display of output.

}

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using turboc++

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//program  to find factorial value of a number using function.

#include<stdio.h>                      //header file

#include<conio.h>

void factorial();                          // function prototype/declaration with return type zero.

void main()                              //main function

{

factorial();                                     // function calling.

getch();                                       //holds the  value

}

void factorial()                             // function body line ; also called function definition

{

 int i,n,facto=1;                    // variable declaration with 1 initialization

printf("enter a number\n");    //message display to input a number

scanf("%d",&n);                //gets input

for(i=1;i<=n;i++)       //loop running from 1 to n with increment 1 each time

{

       facto=facto*i;        //  multiplication of numbers repetitively

}

  

  printf("factorial value=%d\n",facto);    //display of output.

}

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factorial value of a number 6= 6x5x4x3x2x1 or

                                                 1x2x3x4x5x6