# div() function in C++

Given a numerator and denominator, we have to find their quotient and remainder without using the modulo or division operator. div() function allows us to do the same task easily and efficiently.

**div() function : ** Returns the integral quotient and remainder of the division of numer by denom ( numer/denom ) as a structure of type div_t, ldiv_t or lldiv_t, which has two members: quot and rem.

** Syntax: **

div_t div(int numerator, int denominator); ldiv_t div(long numerator, long denominator); lldiv_t div(long long numerator, long long denominator);

When we use div() function, it returns a structure which contains the quotient and remainder of the parameters. The first parameter passed in a div() function is taken as numerator and the 2nd parameter is taken as denominator.

For int values, the structure returned is div_t. This structure looks like this:

`typedef` `struct` ` ` `{ ` ` ` `int` `quot; ` `/* Quotient. */` ` ` `int` `rem; ` `/* Remainder. */` `} ` `div_t` `; ` |

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Similarly, for long values, structure ldiv_t is returned and for long long values, structure lldiv_t is returned.

`ldiv_t` `: ` `struct` `ldiv_t` `{ ` ` ` `long` `quot; ` ` ` `long` `rem; ` `}; ` ` ` `lldiv_t: ` `struct` `lldiv_t { ` ` ` `long` `long` `quot; ` ` ` `long` `long` `rem; ` `}; ` |

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** Where is it useful ? **

The question is, since we have both % and / operators, why should we use div() function?. Well, in a program where we require both – quotient and remainder, using div() function would be the best choice as it calculates both the values for you at once, moreover, it requires less time as compared to using % and / functions one by one.

While using div() function, the difference for the % operator is that, **% operator may return a negative value, but div() always returns a non negative value**. So, div() function can be efficiently used according to one’s requirement.

** What happens when the denominator is 0?**

If any one of the part of this function, i.e. the remainder or the quotient cannot be represented or cannot find a result, then the whole structure shows an **undefined behaviour** .

** NOTE :** While using div() function, remember to include cstdlib.h library in your program.

Examples:

Input : div(40, 5) Output :quot = 8 rem = 0 Input :div(53, 8) Output :quot = 6 rem = 5

** Implementation**

`// CPP program to illustrate ` `// div() function ` `#include <iostream> ` `#include <cstdlib> ` `using` `namespace` `std; ` ` ` `int` `main() ` `{ ` ` ` `div_t` `result1 = ` `div` `(100, 6); ` ` ` ` ` `cout << ` `"Quotient of 100/6 = "` `<< result1.quot << endl; ` ` ` `cout << ` `"Remainder of 100/6 = "` `<< result1.rem << endl; ` ` ` ` ` `ldiv_t` `result2 = ` `div` `(19237012L,251L); ` ` ` ` ` `cout << ` `"Quotient of 19237012L/251L = "` `<< result2.quot << endl; ` ` ` `cout << ` `"Remainder of 19237012L/251L = "` `<< result2.rem << endl; ` ` ` ` ` `return` `0; ` `} ` |

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Output:

Quotient of 100/6 = 16 Remainder of 100/6 = 4 Quotient of 19237012L/251L = 76641 Remainder of 19237012L/251L = 121

This article is contributed by **Ayush Saxena**. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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