In C++, islessequal() is a predefined function in math.h. It is used to check whether the 1st floating point number is less than or equal to the 2nd floating point. The advantage it provides over simple comparison is, it does comparison without raising floating point exceptions. For example, if one of the two arguments is NaN, then it returns false without raising exception.
Syntax:
bool isgreaterequal(a, b)
Parameters:
- a, b => These two are the parameters whose value we want to compare.
Result:
- The function will return the true if a <= b else it returns false.
Error:
No error occurs with this function.
Exception:
- If a or b or both is NaN then the function raised an exception and return false(0).
Illustration of this is given below
#include <bits/stdc++.h>
using namespace std;
int main()
{
float a = 5.5;
double f1 = nan( "1" );
bool result;
result = islessequal(a, f1);
cout << a << " islessequal " << f1
<< ": " << result;
return 0;
}
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Output:
5.5 islessequal nan: 0
Examples:
Applications:
There are variety of applications where we can use islessequal() function to compare two values like to use in while loop to print the first 10 natural number.
#include <bits/stdc++.h>
using namespace std;
int main()
{
int i = 1;
while (islessequal(i, 10)) {
cout << i << " " ;
i++;
}
return 0;
}
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Output:
1 2 3 4 5 6 7 8 9 10
Last Updated :
28 Apr, 2018
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