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  1. // You need this for cin and cout
  2. #include <iostream>
  3.  
  4. // You need this for sqrt
  5. #include <cmath>
  6.  
  7. // You need this for lots of stuff
  8. using namespace std;
  9.  
  10. // Returns true if number is a perfect square
  11. bool IsSquare (int num) 
  12. {
  13. 	// Calculate the square root of num
  14. 	// Casting to an int truncates any decimal parts
  15. 	int sqrt_num = sqrt(num);
  16.  
  17. 	// If the previous line didn't truncate and digits
  18. 	// then the number must be a perfect square.
  19. 	// If the square root squared equals the original
  20. 	// number it is a perfect square!
  21. 	return sqrt_num*sqrt_num == num;
  22. }
  23.  
  24. int main()
  25. {
  26. 	// Perfect squares only work on integers
  27. 	int num;
  28.  
  29. 	// Loop while num
  30. 	while(true){
  31. 		// Ask for number
  32. 		cout << "Enter number to determine if it is a perfect square: \n";
  33. 		cin >> num;
  34.  
  35. 		// Stop if number is less than 1
  36. 		if(num < 1) break;
  37.  
  38. 		// Number was a square
  39. 		if (IsSquare(num)) cout << num << " is a square\n";
  40.  
  41. 		// Number wasn't a square
  42. 		else cout << num << " is not a prefect square\n";
  43. 	}  
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0.01s 2728KB
comments (?)
stdin
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3
9
12
36
0
stdout
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Enter number to determine if it is a perfect square: 
3 is not a prefect square
Enter number to determine if it is a perfect square: 
9 is a square
Enter number to determine if it is a perfect square: 
12 is not a prefect square
Enter number to determine if it is a perfect square: 
36 is a square
Enter number to determine if it is a perfect square:
https://ideone.com/Q4Dv0
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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