1.while
例子:
int a = 10;
int b = 20;
while (b > a) {
a += 1;
std::cout << a << std::endl;
}
2.do...while
int a = 10;
int b = 20;
do {
a += 1;
std::cout << a << std::endl;
} while (b > a);
3.for
for (int i = 0; i < 10; ++i) {
std::cout << i << std::endl;
}
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