Example Analysis of logical operators and logical expressions in C language

This article will explain in detail the example analysis of logical operators and logical expressions in C language. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Logical operators and logical expressions

Sometimes the conditions that need to be judged in the program are more complex, which is a compound condition composed of several simple conditions.

C language uses logical operators and logical expressions to solve the representation of complex conditions.

Give an example

For example:

(1) determine whether the value of the integer variable k is between [0100], and the expression is: K > = 0&&k='A'&&c0&&k%2==1

(4) to determine whether the year y is a leap year, the expression is: y% 4 years 0 | y% 400 years 0

In the process of logical expression calculation, in order to improve the running efficiency of the program, C language uses the rule of "short circuit operation" in logical operation. That is, in addition to considering the operation rules, precedence, and associativity of each operator in the expression, you need to follow the following two rules:

(1) the logical expression calculates the values of each Operand from left to right.

(2) in the above left-to-right calculation process, the calculation process ends whenever the value of the final logical expression can be determined.

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