6.2 switch结构:
变量可以是:variable can be:(mark: tried, can not be long)
char/int/short/byte(java1.7 就可以用String来switch了)
public class Test{
public static void main(String[] args){
double d1=0.0, d2=0.0;
d1 = 11;
d2 = 22;
char o = '+';
switch(o){
case '+':
System.out.println(d1+d2);
break;
case '-':
System.out.println(d1-d2);
break;
case '*':
System.out.println(d1*d2);
break;
case '/':
System.out.println(d1/d2);
}
}
}
6.3 循环
6.3.1 while 循环
public class Test{
public static void main(String[] args){
int lim = 5;
int sum = 0;
int i = 1;
while(i<=lim){
sum =sum + i;
i++;
}
System.out.println("sum = " + sum);
int j = 1;
while(j<=4){
System.out.println("j=" + j);
j++;
}
System.out.println(j);
}
}
更多请见:https://blog.csdn.net/qq_43650923/article/details/101677108
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