int score = 95;
if (score < 10) {
cout << "<10 " << score << endl;
}
else if (score < 90)
cout << "<90 " << endl;
else if (score < 99)
cout << "<99 " << endl;
else
cout << score << endl;
string score = 1 ? "100" : "99";
cout << score << endl;
switch 语句中表达式类型只能是 ==整形== 或 ==字符型==
//int test = 5;
//switch (test)
//{
//case 4:
// cout << 4444 << endl;
// break;
//case 5:
// cout << 5555 << endl;
// break;
//default:
// cout << test << endl;
// break;
//}
TestEnum m;
int key = 0;
cin >> key;
m = (TestEnum)key;
cout << m << endl;
switch (m)
{
case a:
cout << "a" << endl;
break;
case b:
cout << "b" << endl;
break;
case c:
cout << "c" << endl;
break;
default:
cout << "default" << endl;
break;
}
char n = ' ';
cin >> n;
switch (n)
{
case 'a':
cout << "aa" << endl;
break;
case 'b':
cout << "bb" << endl;
break;
case 'c':
cout << "cc" << endl;
break;
default:
cout << "default" << endl;
break;
}
- while(循环条件){循环语句}
int i = 0;
while (true)
{
++i;
cout << i << endl;
if (i == 10)
break;
}
- do {循环语句} while(循环条件)
-
与while的区别在于 do ... while 会先执行一次循环语句
-
案例水仙花数【三位数】:
- 对数字取模于10,可以获取到个数
- 先整除于10,再取模于10,得到十位
-
int num = 100;
do
{
int a = 0; //个位
int b = 0; //十位
int c = 0; //百位
a = num % 10;
b = (num / 10) % 10;
c = num / 100;
if ((a * a * a + b * b * b + c * c * c) == num) {
cout << num << endl;
}
num++;
} while (num < 1000);
- for 循环
- break
- continue
- goto
cout << "1" << endl;
goto FLAG;
cout << "2" << endl;
FLAG:
cout << "3" << endl;