1.前置与后置区别
#includeusing namespace std; int main() { //前置和后置区别 //前置递增或递减 先让变量加减1 然后进行表达式运算 int a1 = 10; int b1 = ++a1 * 10; cout << "a1=" << a1 << endl; cout << "b1=" << b1 << endl; //后置递增或递减 先进行表达式运算，后让变量加减1 int a2 = 10; int b2 = a2++ * 10; cout << "a2=" << a2 << endl; cout << "b2=" << b2 << endl; system("pause"); return 0; }
2.if选择结构
#includeusing namespace std; int main() { //选择结构 int score = 0; cout << "请输入一个分数" << endl; cin >>score; if (score > 600) //if条件后不要加分号 { cout << "恭喜您考上一本大学" << endl; } else { cout << "很遗憾您未能考上一本" << endl; }; //多条件选择结构 int grade = 0; cout << "请输入一个分数"<< endl; cin >> grade; cout << "您输入的分数为：" << grade << endl; if (grade > 600) { cout << "恭喜您考上一本大学" << endl; if (grade>700) { cout << "您能考入985" << endl; } else if (grade>650) { cout << "您能考入211" << endl; } else { cout << "您能考入普通一本" << endl; } } else if (grade > 500) { cout << "恭喜您考上二本大学" << endl; } else if (grade > 400) { cout << "恭喜您考上三本大学" << endl; } else { cout << "很遗憾您未能考上本科" << endl; }system("pause"); return 0; }
3.while与do..while循环结构
#includeusing namespace std; int main() { //while循环语句 //输出数字0~9 int num = 0; while (num < 10) { cout << num << endl; num++; }//do...while循环语句: do{循环语句}while（循环条件）； // 与while的区别在于会先执行一次循环语句，再判断循环条件do { cout << num << endl; num++; } while (num < 10); system("pause"); return 0;
【c++基础知识02】
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