C++中while循环的深入解析与应用实例

while语句:

• 1.计数控制的循环
• 2.时间控制的循环

计数控制的循环

#include
using namespace std;
int main() {int loopcount &＃61; 0;while (loopcount <&＃61; 10) {cout << "hello world&＃xff01;" << endl;loopcount&＃43;&＃43;;}system("pause");return 0;
}


事件控制的循环

#include
#include
using namespace std;
int main() {//终结值控制循环int month, day;cin >> month >> day;while (!(month &＃61;&＃61; 2 && day &＃61;&＃61; 31)) {cout << "这个月有30天" << endl;cin >> month >> day;}//文件尾控制的循环ifstream indata;indata.open("test.txt");int value;indata >> value;while (indata) {cout << value << endl;indata >> value;}indata.close();//标志控制的循环int sum &＃61; 0, i &＃61; 1;bool flag &＃61; true;while (flag) {sum &＃43;&＃61; i;if (sum >&＃61; 100)flag &＃61; false;i&＃43;&＃43;;}cout << "sum &＃61; " << sum << endl;system("pause");return 0;
}


嵌套循环

#include
#include
using namespace std;
int main() {int i &＃61; 1, j &＃61; 1, sum &＃61; 0;while (i <&＃61; 9) {while (j <&＃61; 9) {sum &＃61; i * j;cout << i << "x" << j << "&＃61;" << sum << " ";j&＃43;&＃43;;}i&＃43;&＃43;;j &＃61; i;cout << "\n";}system("pause");return 0;
}