What is the difference between && and & in C language?

In C language, && and & are both logical operators, but there are the following differences: && has a higher priority than &; && is left associative, & is right associative; && returns a Boolean value, & returns an integer value; && short-circuit evaluation, & does not short-circuit evaluation.

The difference between && and & in C language

In C language, && and & are both logical operations symbol, used to operate on Boolean values. However, there are several key differences between them:

1. Operation priority

• && has a higher operation priority than &. This means that && will be executed before & in the expression.

2. Associativity

• && has left associativity, while & has right associativity. This means that when multiple && or & operators appear in an expression, && will operate on the leftmost operand in the expression first, and & will operate on the rightmost operand in the expression first. Perform calculations.

3. Operation result The operation result of

• && is a Boolean value (true or false). The result of
• & is an integer value (0 or 1).

4. Short-circuit evaluation

• && has short-circuit evaluation characteristics. This means that if the first operand is false, the second operand will not be evaluated and the result of the entire expression will be false.
• & does not have short-circuit evaluation characteristics. The second operand is evaluated regardless of the value of the first operand, and the result of the entire expression will be 0 or 1.

Example

The following code example demonstrates the difference between these two operators:

int a = 1, b = 0;

printf("&&: %d\n", a && b); // 输出: 0 (假)
printf("& : %d\n", a & b); // 输出: 0 (0)

In the first example , since a is true but b is false, the && expression evaluates to false. In the second example, since a is true and b is false, the & expression evaluates to 0 (an integer value).

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