Skip to main content

C Program to Check whether a given number is Perfect or Not

 C Program to Check whether a given number is Perfect or Not.


In this exmaple we will learn to check a given number is a Perfect Number or not. 


LOGIC OF PERFECT SQUARE NUMBER:

  • At first we have declared variables i,num,sum=0(value is initialized to zero). 

  • Then we have inputted the number from the user and stored in num.

  • After that we have to to add a loop i=1 till num/2 and to increment the iteration by 1. You all must be thinking why we have to run the loop till num/2 because a number does not have any positive integer greater than the half of the number that is num/2.

  • Then we have to check whether the remainder of num%i is equal to zero or not. If it is equal then the value of i is a proper divisor of the number entered by the user and it is added to sum.

  • Now we have to check if the sum of the proper divisors of the number equal to the original number. If it is equal then the number entered by the user is a perfect number otherwise it is not a perfect number.


PROGRAM OF PERFECT NUMBER:

#include<stdio.h>
int main()
{
    int i,num,sum=0;
    printf("Enter any number to check perfect number:");
    scanf("%d",&num);
    for(i=1;i<=num/2;i++)
    {
        if(num%i==0)
        {
            sum+=i;
        }
    }
    if(sum==num)
    {
        printf("%d is PERFECT NUMBER\",num);
    }
    else
    {
        printf("%d is NOT A PERFECT NUMBER",num);
    }
    return 0;
}


OUTPUT:

C Program to Check whether a given number is Perfect or Not


PERFECT NUMBER:


Perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. 


  • There are 51 known perfect numbers in total.

  • First five perfect numbers are 6,28,496,8128 and 33550336

  • There are only 2 perfect numbers between 1 to 100 and 3 perfect numbers between 1 to 1000.

  • Euclid was the first individual to categorize the perfect numbers.

Labels:

Comments

Post a Comment

Please do not spam any link

Popular posts from this blog

C Program to input Values in a 2x2 square matrix and display the value

 C Program to input Values in a 2x2 square matrix and display the value     In this example, we will accept values from the user in a 2x2 square and matrix and then it is displayed. To solve this problem we must know what is matrices and arrays. What are Arrays?      An array is a data structure for storing more than one data member of similar data type.          Array can be of following types: One-dimensional Array Two-dimensional Array Multi-dimensional Array             In Array we must always initialize values. PROGRAM #include <stdio.h> #include <conio.h> int   main () {      int   a [ 2 ][ 2 ], i , j ;      printf ( "Enter the values of the matrix:" );      for ( i = 0 ; i < 2 ; i ++)     {          for ( j = 0 ; j < 2 ...
Post a Comment
Read more

C Program to find the sum of the elements of a 2-D array.

 C Program to find the sum of the elements of a 2-D array.     In this example, we will find the sum of the elements of a 2-D array allowing the user to enter the row size and column size according to their requiremnts.      Here in the output we have entered a row  size 3 and column size 3. PROGRAM #include <stdio.h> #include <conio.h> void   main () {      int   a [ 50 ][ 50 ], r , c , i , j , sum = 0 ;      printf ( "Enter the row size and column size of the array :" );      scanf ( " %d%d " ,& r ,& c );      printf ( "Enter the elements of the array : " );      for ( i = 0 ; i < r ; i ++)     {          for ( j = 0 ; j < c ; j ++)       ...
Post a Comment
Read more

C Program to input and display details of students using structure

 C Program to input and display details of students using structure.       In this example, we will enter the details of students like roll number, name and total marks using structure and will be displayed. The total number of student should be entered according to the requirements of the user(maximum value is 50). We can increase the maximum number by changing the statement struct student[50];  to struct student[100];     Here in the output we have entered details of four student and displayed them accordingly. PROGRAM #include <stdio.h> #include <conio.h> struct   student {      int   roll ;      char   name [ 20 ];      int   total ; }; void   main () {      int   i , n ;      struct   student   std [ 50 ];      printf ( "Enter the number of students ...
Post a Comment
Read more

C Program to find the Transpose of a Matrix.

C Program to find the Transpose of  a Matrix.       In this example, we will find the transpose of a given matrix according to the requirements of the row size and column size.      Here in the output we have entered a 3x2 Matrix whose transpose will be 2x3 Matrix. PROGRAM #include <stdio.h> #include <conio.h> int   main () {      int   row , column , i , j , a [ 100 ][ 100 ];      printf ( "Enter the row size of the matrix :" );      scanf ( " %d " ,& row );      printf ( "Enter the column size of the matrix : " );      scanf ( " %d " ,& column );      printf ( "Enter the elements of the matrix : " );      for ( i = 0 ; i < row ; i ++)     {  ...
Post a Comment
Read more

C Program to find Mean and Standard deviation(SD) for a set of n numbers using array.

 C Program to find Mean and Standard deviation(SD) for a set of n numbers using array.     In this example, we will calculate the mean and standard deviation for a set of n numbers entered by the user using array.    PROGRAM TO FIND THE MEAN AND STANDARD DEVIATION(SD) FOR A SET OF N NUMBERS USING ARRAY. #include <stdio.h> #include <math.h> #include <conio.h> void   main () {      int   n , i ;      float   x [ 50 ], mean , sd , sum ;      printf ( "How many numbers you want to enter : " );      scanf ( " %d " ,& n );      printf ( "Enter the numbers " );      for ( i = 0 ; i < n ; i ++)      {          scanf ( " %f " ,& x [ i ]);     }      f...
Post a Comment
Read more