C Program to Check whether a given Number is Perfect Number:

This is a C Program to check whether a given number is perfect number.

Program Description:

This C Program checks whether a given number is perfect number.

Problem Solution

Perfect number is a number which is equal to sum of its divisor. For eg, divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as a perfect number.

Program/Source Code

/*
 * C Program to Check whether a given Number is Perfect Number
 */
#include 
 
int main()
{
    int number, rem, sum = 0, i;
 
    printf("Enter a Number\n");
    scanf("%d", &number);
    for (i = 1; i .... Show More

This is a C Program to check whether a given number is perfect number.

Program Description:

This C Program checks whether a given number is perfect number.

Problem Solution

Perfect number is a number which is equal to sum of its divisor. For eg, divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as a perfect number.

Program/Source Code

/*
 * C Program to Check whether a given Number is Perfect Number
 */
#include 
 
int main()
{
    int number, rem, sum = 0, i;
 
    printf("Enter a Number\n");
    scanf("%d", &number);
    for (i = 1; i <= (number - 1); i++)
    {
        rem = number % i;
    if (rem == 0)
        {
            sum = sum + i;
        }
    }
    if (sum == number)
        printf("Entered Number is perfect number");
    else
        printf("Entered Number is not a perfect number");
    return 0;
}

Program Explanation

In this C program, we are reading the integer value using number variable. Perfect number is a number which is equal to sum of its divisor. For example, divisors of 6 are 1, 2 and 3. The sum of these divisors is 6. So the number 6 is called as perfect number.

For loop statement is used to assign the modulus of the value of number variable by the value of i variable. If condition statement is used to check the value of rem variable is equal to 0, if the condition is true to execute if condition statement and compute the summation the value of sum variable with the value of i variable.

Another If-else condition statement is used to check that both the value of sum variable and the value of number variable are equal, if the condition is true print the statement as perfect number. Otherwise, execute else condition statement and print the statement as not a perfect number.

Output:

Enter a Number

6

Entered Number is perfect number

 

Enter a Number

100

Entered Number is not a perfect number