User Define Function Factorial

Q. Write a function fact to calculate the factorial value of any number.

Ans.

/*c program for make function fact to calculate factorial value of any number*/
#include<stdio.h>
int fact(int );
int main()
{

 int num,f;
 printf("Enter any number : ");
 scanf("%d", &num);
 f = fact(num);
 printf("Factorial value of %d is %d",num,f);
 return 0;
}

int fact(int n)
{
 int z=1;
 for(; n>=1; n--)
    z = z * n;
 return(z);
}

The output of above program would be:

Figure: Screenshot for find factorial value using
user define function C program

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Factorial C program Algorithm Flowchart

Q. Write a C program to find the factorial value of a number. Also write the algorithm and draw flowchart.

Ans.

/*c program to find out factorial value of a number*/
#include<stdio.h>
#include<conio.h>
int main()
{
 int n,i,fact=1;
 printf("Enter any number : ");
 scanf("%d", &n);
 for(i=1; i<=n; i++)
    fact = fact * i;
 printf("Factorial value of %d = %d",n,fact);
 return 0;
}

The output of above program would be:

Screen shot for calculate factorial value
of a number C program

Algorithm for calculate factorial value of a number:

[algorithm to calculate the factorial of a number]
step 1. Start
step 2. Read the number n
step 3. [Initialize]
        i=1, fact=1
step 4. Repeat step 4 through 6 until i=n
step 5. fact=fact*i
step 6. i=i+1
step 7. Print fact
step 8. Stop
[process finish of calculate the factorial value of a number]

Flowchart for calculate factorial value of a number:

Figure: Flowchart for calculate factorial value of
a number C program

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