What does == mean in c language

In C language, the == operator is used to compare whether the values ​​of two expressions are equal and return a Boolean value of true or false. Specific uses include: comparing values ​​of basic data types. Compare strings (using the strcmp() function). Compare pointers (check if pointers point to the same memory location).

== The meaning of operator in C language

in C language , == operator is an equality comparison operator, used to compare whether the values ​​of two expressions are equal. It returns a Boolean value: true (true) or false (false).

Specific uses:

== Operators are mainly used for the following purposes:

• Compare basic data types (such as integer, floating point number, character) value.
• Compare strings (using the strcmp() function).
• Compare pointers (used to check if pointers point to the same memory location).

Syntax:

== The syntax of the operator is as follows:

<code>expr1 == expr2</code>

whereexpr1 and expr2 are the expressions that need to be compared.

Example:

<code class="c">int a = 10;
int b = 10;

if (a == b) {
  printf("a 和 b 相等。\n");
}</code>

In the above example, the values ​​of a and b are equal, so if The statement will be executed and "a and b are equal." will be output.

The above is the detailed content of What does == mean in c language. For more information, please follow other related articles on the PHP Chinese website!