C++ Math nextafter() Function

C++ Math nextafter() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math nextafter()

The nextafter() function represents the next representable value in a specific direction.

Suppose two numbers are 'from' and 'to'. Therefore, the nextafter() function finds the next value of 'from' in the direction of 'to'.

Syntax

float nextafter( float from, float to);
double nextafter( double from, double to);
long double nextafter( long double from, long double to);
promoted nextafter( arithmetic from, arithmetic to);

Note: If any argument is long double, then the return type is long double. If not, the return type is double.

Parameter

( from, to): These are the floating point values.

Return value

If 'from' equals to 'to', it returns the value of 'from'.
If no error occurs, the next representable value of 'from' is returned.

Example 1

Let's see a simple example when the value of 'from' and 'to' are equal.

#include 
#include
using namespace std;
int main()
{
     float from=6.7;
     float to=6.7;
     cout<<"Values of from and to are:"<

Output:

Values of from and to are:6.7, 6.7
6.7

In the above example, values of 'from' and 'to' are equal. Therefore, the function returns the value of 'from'.

Example 2

Let's see a simple example when 'from' and 'to' are of same type.

#include 
#include
using namespace std;
int main()
{
      double from=0.0;
      double to=6.0;
      cout<<"Values of from and to are:"<

Output:

Values of from and to are:0, 6
4.94066e-324

In the above example, 'from' and 'to' are of same type but are unequal. The nextafter() function returns the value i.e 4.94066e^-324

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