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:
int a = 10; int b = 10; if (a == b) { printf("a 和 b 相等。\n"); }
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.
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