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1:for循环语句
for语句基本格式
for(初始条件表达式;判断条件表达式;控制条件表达式) {
循环体;
}
for循环的执行流程
A:执行初始条件表达式
B:判断控制变量的值
如果判断为true,则执行下一步;为false,则结束
C:执行循环体
D:执行控制条件表达式,控制变量
E:再回到B
2:while循环
while语句基本格式
while(判断条件表达式) {
语句体;
}
变形
初始条件表达式
while(判断条件表达式) {
语句体
}
while循环的执行流程(略)
3:do...while循环
do...while语句基本格式
do {
语句体
}while(判断条件表达式)
变形
初始条件表达式
do {
语句体
}while(判断条件表达式)
do...while循环执行流程(略)
*注意事项
A:三种循环的比较
for循环和while循环中的循环体可以一次不执行,do...while循环中循环体
至少执行一次
B:三种循环的使用
a:可以相互等价转换,相互改写
b:当循环变量需要保留下来供以后计算,则使用while循环在循环体前面定义
控制变量;否则建议优先使用for循环,提高程序运行效率;其次是while循
环,最后是do...while循环
C:for循环适用于知道一定范围,while循环更常用于循环次数不一定
*案例
A:输出十次"HelloWorld"
B:打印1-10
C:打印10到1
D:计算1-100之和
E:计算1-100数中偶数的和
F:打印水仙花数
G:珠穆朗玛峰高度
H:
4:循环的嵌套使用
*案例
A:
B:
C:
5:跳转控制语句
6:方法
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