What does % mean in c++

% in C represents the modulo operation, which calculates the remainder between two integers. The syntax is result = a % b, where a and b are integers, and result is the remainder when a is divided by b. Additionally, the percent sign is used in stream formatting (such as printf() and cout) and character escaping.

The meaning of % in C

In C, the percent sign (%) represents the modulo operation . It calculates the remainder between two integers.

Syntax:

<code class="cpp">result = a % b;</code>

Where:

• a and b are integers
• result is the remainder when a is divided by b

How it works:

The modulo operation uses two integers to divide and returns the remainder after division. For example:

<code class="cpp">result = 10 % 3;</code>

The result will be 1 because the remainder of 10 divided by 3 is 1.

Other uses:

The percent sign has other uses in C, including:

• Stream formatting : In stream formatting functions such as printf() and cout, % is used to specify the format of the data.

• Character escape: % can be used to escape special characters in a string, for example:

  <code class="cpp">char c = '\n';  // 换行符</code>

Note:

• If b is 0, the modulo operation will cause a runtime error.
• The result of the modulo operation is always the same sign as a.

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