In this tutorial, we will write a C++ program to check for sunny numbers.
What is Sunny Number?
N is said to be a sunny number if the number next to the given number
(N+1) is a perfect square.
Example: Let us take a Number 8, then the next number is
8+1=9 and as 3 is a square root of 9, hence 8 is a sunny Number.
Another example, let the number be 5, then
5+1=6, that has no square roots, hence 5 is not a sunny Number.
Sunny Number Program in C++
Question: Check if the given number is a sunny number or not in C++ programming.
using namespace std;
bool is_sunny(int); //function prototype
cout << "Enter the number: ";
cin >> num;
cout << num << " is a sunny number";
cout << num << " is NOT a sunny number";
bool is_sunny(int n)
// find the square root
int square = sqrt(n + 1);
return (square *square == n);
Enter the number: 81
81 is a sunny number
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