设变量已正确定义,选项()与以下程序段不等价。switch(choice){case1:price=3.0;case2:price=2.5;default:price=0.0;}A.price=0.0;B.switch(choice){default:price=0.0;case2:price=2.5;case1:price=3.0;}C.price=0.0;switch(choice){case1:price=3.0;case2:price=2.5;}D.if(choice==1){price=3.0;price=2.5;price=0.0;}elseif(choice==2){price=2.5;price=0.0;}else{price=0.0;}

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2022-05-27

设变量已正确定义,选项()与以下程序段不等价。switch(choice){case1:price=3.0;case2:price=2.5;default:price=0.0;}A.price=0.0;B.switch(choice){default:price=0.0;case2:price=2.5;case1:price=3.0;}C.price=0.0;switch(choice){case1:price=3.0;case2:price=2.5;}D.if(choice==1){price=3.0;price=2.5;price=0.0;}elseif(choice==2){price=2.5;price=0.0;}else{price=0.0;}

答案：

switch(choice){default:price=0.0;case2:price=2.5;case1:price=3.0;};price=0.0;switch(choice){case1:price=3.0;case2:price=2.5;}

举一反三

内容

0
分析下面的 Javascript 代码段var p=2; switch (p){ case 1 : document.write("case 1"); case 2 : document.write("case 2"); default : document.write(" default"); } 输出的结果是（） A: case1; B: case2; C: default; D: case2 default
1
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2
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3
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4
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