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What is div() in C++?

Syed Muhammad Ali Mustafa

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

We can use the div() function to calculate the integral quotient and remainder of the division of two numbers.

where,

  • quotient(x / y) = floor(x / y)
  • remainder(x / y) = x % y

% represents the modulus operator.

Mathematically, the quotient Q and remainder R of the division x/y can be represented as:

Library

To use the div() function, include the following library:

#include <cstdlib>

Declaration

The div() function is declared as:

div_t div(int x, int y);

Or:

ldiv_t div(long x, long y);

Or:

lldiv_t div(long long x, long long y);
  • x: The numerator of the division.
  • y: The denominator of the division.

Return value

The div() function returns a struct data structure of type div_t, ldiv_t, or lldiv_t that contains the quotient and remainder of the division. The quotient and the remainder can be accessed as shown below:

div_t div1 = div(x, y);
quotient = div1.quot;
remainder = div1.rem;

Note: If denominator y is 0, a floating-point exception is thrown.

Code

Example 1

Consider the code snippet below, which demonstrates the use of the div() function:

#include <cstdlib>
#include <iostream>
using namespace std;
int main() {
div_t div1 = div(19, 3);
cout << "Quotient(19/3) = " << div1.quot << endl;
cout << "Remainder(19/3) = " << div1.rem << endl;
return 0;
}

Explanation

We use the div() function in line 6 to compute the quotient and remainder of two numbers. The return value of div() is assigned to a div_t type variable that is named div1. The quotient and remainder of the division can be accessed using div1.quot and div1.rem, respectively.

Example 2

Consider the code snippet below, which demonstrates the execution of the div() function when the denominator is 0:

#include <cstdlib>
#include <iostream>
using namespace std;
int main() {
div_t div1 = div(19, 0);
cout << "Quotient(19/0) = " << div1.quot << endl;
cout << "Remainder(19/0) = " << div1.rem << endl;
return 0;
}

Explanation

A floating-point exception is thrown because the denominator of the division is 0.

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Syed Muhammad Ali Mustafa
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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