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C++ Math modf()

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

For example :

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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