C++ Math modf() Function

C++ Math modf() 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 modf()

This function is used to divide a number into integral and fractional part.

For example :

2.16 = 2 + 16

Syntax

Suppose a number is 'x' and 'ptr' is the pointer to an integral part.

float modf(float x, float* ptr);
double modf(double x, double* ptr);
long double modf(long double x, long double* ptr);
double modf(integral x, double* ptr);

Parameter

x: The value which is to be broken into two parts i.e(fractional and integral part).

ptr: It is the pointer to an object where the integral part of x is stored.

Return value

It returns the integral part of x.

Example 1

Let's see a simple example

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
 float x=18.26;
 double ptr;
 float i=modf(x,&ptr);
 std::cout << "Value of x is : " <<x <<std::endl;
 cout<<"integral part of x is :"<<ptr<<'\n' ;
 cout<<"fractional part of x is :"<<i;
 return 0;
}

Output:

Value of x is : 18.26
integral part of x is :18
fractional part of x is :0.26

In this example, modf() function breaks a number into fractional and integral part. Fractional part is 0.26 and integral part is 18.

Example 2

Let's see a simple example when the value of x is negative.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float x= -78.34;
    double ptr;
    float n=modf(x,&ptr);
    std::cout << "Value of x is : " <<x <<std::endl;
    cout<<"integral part of x is :"<<ptr<<'\n' ;
    cout<<"fractional part of x is :"<<n;
    return 0;
}

Output:

Value of x is : -78.34
integral part of x is :-78
fractional part of x is :-0.339996

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