In this C++ tutorial, you will learn how to find next representable value after x in direction of y, using nexttoward() function of cmath, with syntax and examples.
C++ nexttoward()
C++ nexttoward(x, y) returns next representable value after x in direction of y.
Syntax
The syntax of C++ nexttoward() is
nexttoward(x, y)where
| Parameter | Description |
|---|---|
| x | A double, float, long double, or integral type value. |
| y | A double, float, long double, or integral type value. |
Returns
The return value depends on the type of value passed for parameter x.
The return value of nexttoward() is
- double if x is double or integral type.
- float if x is float.
- long double if x is long double.
The synopsis of nexttoward() function is
double nexttoward(double x, long double y);
float nexttoward(float x, long float y);
long double nexttoward(long double x, long double y);
double nexttoward(T x, long double y); // where T is any integral typenexttoward() is a function of cmath library. Include cmath library at the start of program, if using nexttoward() function.
Example
In this example, we read two values from user, into variables x and y, and compute the next representable value next to x towards y using nexttoward() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
long double x, y;
cout << "Enter x : ";
cin >> x;
cout << "Enter y : ";
cin >> y;
long double result = nexttoward(x, y);
cout << "Next Value : " << result << endl;
}Output
Enter x : inf
Enter y : 0
Next Value : 1.79769e+308
Program ended with exit code: 0Enter x : -inf
Enter y : 0
Next Value : -1.79769e+308
Program ended with exit code: 0Enter x : 8555246635
Enter y : 0
Next Value : 8.55525e+09
Program ended with exit code: 0Conclusion
In this C++ Tutorial, we learned the syntax of C++ nexttoward(), and how to use this function to find the next representable value of a number in the direction of other number, with the help of examples.