Practice Program






  • Program of factorial of a numbers.

    • Solution: through for loop 
    void main()
{
    int i,n,fact=1;

    printf("Enter the number:");
    scanf("%d",&n);

  for(i=1; i<=n; i++)
  {
      fact = fact * i;
  }
  printf("\nFactorial of %d is %d",n,fact);
}

    Output1
    Enter the number:5

    Factorial of 5 is 120.
    Output2,
    Enter the number:10

    Factorial of 10 is 3628800.
    Output3
    Enter the number:15

    Factorial of 15 is 2004310016.




    Solution : through while loop 
    void main()
{
    int i,n,fact=1;

    printf("Enter the number:");
    scanf("%d",&n);

  i=1;
  while( i<=n)
  {
      fact = fact * i;
      i++;
  }
  printf("\nFactorial of %d is %d",n,fact);
}





    Solution: from do-while loop 
    void main()
{
    int i,n,fact=1;

    printf("Enter the number:");
    scanf("%d",&n);

  i=1;
  do
  {
      fact = fact * i;
      i++;
  }while( i<=n);
  printf("\nFactorial of %d is %d",n,fact);
}




    defining a function 'fact' which will return factorial of a number.

    int fact(int n)
{
    int i,fact=1;

    for(i=1; i<=n; i++)
    {
        fact = fact *i;
    }
    return fact;

}

    Using above define function 'fact':
    void main()
{
    int n,result;

    printf("Enter the number:");
    scanf("%d",&n);

   result = fact(n);

   printf("Factorial of %d is %d",n,result);
}

    Output1
    Enter the number:5

    Factorial of 5 is 120.

    Using above define function 'fact':
    void main()
{
    int n,result;

    printf("Enter the number:");
    scanf("%d",&n);

   result = fact(n);

   printf("Factorial of %d is %d",n,result);
}

    Output2
    Enter the number:10

    Factorial of 10 is 3628800.

    Using above define function 'fact':
    void main()
{
    int n,result;

    printf("Enter the number:");
    scanf("%d",&n);

   result = fact(n);

   printf("Factorial of %d is %d",n,result);
}

    Output3
    Enter the number:15

    Factorial of 15 is 2004310016.