Usage of % in c++

The modulo operator (%) calculates the remainder of the division of two numbers. The rules are as follows: Divide positive numbers: the remainder is non-negative and less than the divisor. Division of negative numbers: the remainder is negative and its absolute value is less than the absolute value of the divisor. Divide a positive number by a negative number: the remainder is negative and its absolute value is less than the absolute value of the divisor. Divide a negative number by a positive number: the remainder is positive and less than the divisor.

The modulo operator (%) in C

The modulo operator (%) is used to calculate The remainder obtained after dividing two numbers. It is a binary operator, which means it requires two operands.

Grammar

<code class="cpp">result = operand1 % operand2;</code>

Operation rules

• Division of two positive numbers: The result is a non-negative remainder, less than the divisor.
• Dividing two negative numbers: The result is a negative remainder, and the absolute value is less than the absolute value of the divisor.
• Dividing a positive number by a negative number: The result is a negative remainder whose absolute value is less than the absolute value of the divisor.
• Dividing a negative number by a positive number: The result is a positive remainder that is less than the divisor.
• Cannot perform modulo operation on floating point numbers.

Example

<code class="cpp">int a = 10 % 3; // 结果为 1
int b = -10 % 3; // 结果为 -1
int c = 10 % -3; // 结果为 1
int d = -10 % -3; // 结果为 -1</code>

Note

• If the divisor is 0, then take Modulo arithmetic can cause runtime errors.
• The modulo operator has lower precedence than arithmetic operators.

• The modulo operator can be used to solve various programming problems, such as:

  • Count the number of loops
  • Determine whether a number can be modified by another number Divide a number
  • Generate random numbers

Other uses

The modulo operator can also be used for bit operations , used to get specific bits of a binary number:

<code class="cpp">int mask = 1 << 3; // 创建一个掩码，表示二进制数的第 4 位
int result = number & mask; // 对 number 进行位与运算，提取第 4 位</code>

In this way, we can check or set specific bits of a binary number.

The above is the detailed content of Usage of % in c++. For more information, please follow other related articles on the PHP Chinese website!