/* // 4 什么是表达式 #include <iostream> using namespace std; int main() { for(int i=0; i<=60; i++) { if(i%6 == 0) { cout<<"\n"; } cout<<i<<"\t"; } return 0; }*/ /* // 5 赋值运算符与数学运算符 #include <iostream> using namespace std; int main() { int a=2; a = a *= 6; cout<<a<<endl; return 0; } */ /* // 6 什么是自加与自减 #include <iostream> using namespace std; int main() { int a = 1; cout<<a++<<endl; cout<<a<<endl; int b = 11; cout<<b--<<endl; cout<<b<<endl; return 0; } */ /* // 7 表达式的优先级 #include <iostream> using namespace std; int main() { int a = (1+2)*(3+4)*5; cout<<a<<endl; return 0; } */ /* // 8 关系运算符 #include <iostream> using namespace std; int main() { int x = 1, y = 2; if(x >= y){ cout<<x<<endl; }else{ cout<<y<<endl; } return 0; } */ /* //9 if语句 #include <iostream> using namespace std; int main() { int x = 3, y=2; if(x<y) { cout<<"x不等于y\n"; cout<<"y大于x\n"; cout<<"x小于y\n"; } cout<<"x不等于0\n"; return 0; } */ /* //10 else语句 #include <iostream> using namespace std; int main() { int a, b; cout<<"请输入第一个值:"<<endl; cin>>a; cout<<"请输入第二个值:"<<endl; cin>>b; if(a>b) { cout<<"第一个数比第二个数大"<<endl; }else{ cout<<"第二个数比第一个数大"<<endl; } cout<<"该程序执行完毕"<<endl; return 0; } */ /* //12 if语句的嵌套 #include <iostream> using namespace std; int main() { cout<<"请佃入一个整数:"<<endl; int x; cin>>x; if(x > 1) { if(x<100) cout<<"x大于1小于100"<<endl; else cout<<"x大于或者等于100"<<endl; }else{ if(x<1) cout<<"x小于1"<<endl; else cout<<"x等于1"<<endl; } } */ /* //16 逻辑非运算符 #include <iostream> using namespace std; int main() { cout<<"请输入一个大于1的整数:"<<endl; int x; cin>>x; if(!x==0){ cout<<"x不等于0"<<endl; }else{ cout<<"x等于0"<<endl; } return 0; } */ // 18 运算式的真假关系 #include <iostream> using namespace std; int main() { char a ='\0'; if(!a) { cout<<"a的值为0"<<endl; }else{ cout<<"a的值不为0"<<endl; } return 0; }