C++ isgreater()

The isgreater() function compares two floating-point values and returns true only when the first is strictly greater than the second. It follows IEEE-754 rules, never raises floating-point exceptions, and always returns false if either argument is NaN. Integer inputs are promoted to floating-point. The function is available through the <cmath> header.

Syntax

isgreater(x, y)

Parameters:

• x, y: Arithmetic values (integers or floating-point types).

Note: Integer arguments are promoted to the appropriate floating-point type.

Return value:

The isgreater() function returns:

• true if x > y and neither argument is NaN
• false otherwise, including when either value is NaN

Example

The following example checks whether one number is greater than another, including a comparison involving NaN:

#include <iostream>
#include <iostream>
#include <cmath>

using namespace std;

int main() {
  double x = 10.5;
  double y = 5.2;
  double z = nan("1");

  cout << boolalpha;
  cout << "isgreater(x, y): " << isgreater(x, y) << endl;
  cout << "isgreater(x, z): " << isgreater(x, z) << " (NaN comparison)" << endl;

  return 0;
}

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The output of this code is as follows:

isgreater(x, y): true
isgreater(x, z): false (NaN comparison)

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Codebyte Example

The following example is runnable and outputs whether one number is greater than another using isgreater():

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