Branch control

Branch control

• Relational operators and relational expression

  Comparison operation implemented>, <, <=,> = priority higher than ==! =

  Relational expression true false zero zero

• Logical and logical expressions

  1. && || ！

  Non-logic, arithmetic operators, relational operators, logical AND, logical OR priority increment

  2. Judgment ch is an uppercase character

     (zh >= 'A') && (zh <= 'Z') 
        
     

• Branch structure single, double, multi-branched structure

  1. Ternary operator expression 1? Expression 2: Expression 3

  2. Compound statement (Compound Statement) {} using the plurality of pieces of content comprising

     else is always paired with the nearest if (unpaired) statement

• Switch statement

  1. Robustness - Good fault tolerance

  2. switch(表达式)
     {
         case 常量1: 				break;
         case 常量2: 				break;
         ……
         default :
     }
     

     After the match constant, it will perform all subsequent statements until it encounters a break

     Program test, try to cover all branches

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