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What does div mean in C language

Apr 03, 2025 pm 05:33 PM
c language

In C language, div is a division operator, used to perform integer division, returning the quotient of x divided by y. It comes in two forms, depending on the symbols of x and y. It is used for integer division, calculating array indexes, and performing other arithmetic operations, but truncates the fractional part and causes undefined behavior when y is 0.

What does div mean in C language

The meaning of div in C language

div is a division operator in C language and is used to perform integer division.

How to use div

The div operator has two forms:

  • div(x, y) : Returns the quotient after x is divided by y. If x and y are both positive integers, the returned quotient is also a positive integer.
  • div(x, y) : Similar to the first form, but if x or y is a negative number, the returned quotient is also a negative number.

For example:

 <code class="c">int x = 10, y = 3; printf("div(x, y) = %d\n", div(x, y)); // 输出3 printf("div(-x, y) = %d\n", div(-x, y)); // 输出-3</code>

The purpose of div

The div operator is usually used in the following scenarios:

  • Integer division: Get the quotient of two integers.
  • Calculate array index: Calculate the index of elements in an array, such as arr[div(i, N)].
  • Other arithmetic operations: For example, a div can be used for modulo operations (taking the remainder):
 <code class="c">int x = 10, y = 3; printf("x %% y = %d\n", x % y); // 输出1</code>

Notice:

  • The div operator truncates the fractional part.
  • If y is 0, div will cause undefined behavior.
  • To avoid integer overflow, make sure to perform appropriate type conversion of operands before using div.

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