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C, C++ Program to Check whether an Input Number is a Perfect Square or not

Write a C, C++ program to check whether an input number is a perfect square or not. In this program, We will not use an in-built function such as sqrt() to solve this question.



C, C++ programming questions for practice

Find cube of a number

Perfect Square

A number is a perfect square if it is the square of an integer.

For example - 25 is a perfect square. You can write it as 5 * 5 which is the square of an integer. But 17 is not a perfect square.


C Program to Check an Input Number is Perfect Square or not


#include <stdio.h>

int main(void) {

   int num, flag = 0;
 
   printf ("Enter a number \n");
   scanf ("%d", &num);
 
   for (int i = 1; i <= num; i++) {
  
                 
      if ( i * i == num) {
   
         flag = 1;
         break;
      }
  
      if ( i * i > num) {
   
        break;
   
      } 
   }
 
   if (flag) {
  
      printf (" %d is a perfect square", num);
  
    } else {
  
      printf (" %d is not a perfect square", num);
    }

   return 0;
}



Output :

Enter a number :  4

4 is a perfect square


Enter a number : 7

7 is not a perfect square

C++ Program to Check wether an Input Number is a Perfect Square or not


#include <iostream>
using namespace std;

int main() {
 
   int num, flag = 0;
 
   cout << "Enter a number \n";
   cin  >> num;
 
   for (int i = 1; i <= num; i++) {
  
     /* If it is equal to an input number
      * then it's a perfect square
      */
     if ( i * i == num) {
   
         flag = 1;
         break;
     }
  
     /**
      * If it's greater than input number 
      * so no need to check further
      * break the loop
      */ 
     if ( i * i > num) {
   
        break;
   
      } 
   }
 
   if (flag) {
  
     cout << num << " is a perfect square";
  
   } else {
  
     cout << num << " is not a perfect square";
 }
 
 return 0;
}



3 comments:

  1. This comment has been removed by a blog administrator.

    ReplyDelete
  2. Yes, very Useful. This is very good algorithm, thank you for this program, needed :) <3

    ReplyDelete
  3. There was very wonderful information and that's great one. I really appreciate the kind words, thanks for sharing that valuable information useful algorithm..

    ReplyDelete