Judgment statement _switch and case

[1]Syntax

The value following the

switch can be either a value or an expression, but only a value can follow the case!

switch (value/expression){case value1:statements1 // When the result of the expression/value equals value1, execute the codebreak;case value2:statements2 // When the result of the expression/value equals value2, execute the codebreak;......case valueN:statementsN // When the result of the expression/value equals valueN, execute the codebreak;default :statements // If there is no value equal to the expression/value, execute the code}

[2]Comparison process

The switch statement compares the value of the expression with the value in the case clause in turn:

• If the two are equal, execute the following statement segment, and jump out of the entire switch statement when the break keyword is encountered.
• If not equal, continue to match the next case.
• The switch statement contains an optional default keyword, if no equal condition is found in the previous case, the statement following the default is executed
• The comparison process is congruent!