switch-case例题及其与if-else的转换
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Java学习入门——switch-case例题及其与if-else的转换
switch-case例题及其与if-else的转换
编写程序:从健盘上输入某一年的month和day要求通过程序输出输入的日期为某年的第几天。
Write a program: input the month and day of a certain year from the keyboard, and request that the input date through the program output be the day of a certain year.
用switch-case语句改写图中程序
Use switch-case statement to rewrite the program in the figure
编写程序:从键盘上读入一个学生成绩，存放在变量score中，根据score的值输出其对应的成绩等级:
score>=90 等级: A
70<=score<90 等级: B
60<=score<70 等级: C
score<60 等级: D
Write a program: read a student's grade from the keyboard, store it in the variable score, and output its corresponding grade according to the value of the score:
score>=90 Grade: A
70<=score<90 Grade: B
60<=score<70 Grade: C
score<60 Grade: D
switch-case与if-else转换说明
① 凡是可以使用switch-case的结果都可以使用if-else。反之不成立。
② 在写分支结构时，出现既可以使用switch-case（case的取值情况不能太多），又可以使用if-else，优先使用switch-case（原因switch-case的执行效率稍高)。
switch-case and if-else conversion description
① Any result that can use switch-case can use if-else. The opposite does not hold.
② When writing a branch structure, it appears that you can use switch-case (the value of the case can not be too many), and you can use if-else, and switch-case is preferred (because the execution efficiency of switch-case is slightly higher).
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