C++程序控制结构

if(x>0)cout<<x<<endl;

if((a+b>c)&&(a+c>b)&&(bn+c>a)){
    cout<<a<<endl;
}else{
    cout<<b<<endl;
}

switch(表达式)
{
    case 常量表达式1:语句1;break
    case 常量表达式2:语句2;break
    default:语句2;
}

int year, month, days;
    cout << "year=";
    cin >> year;
    cout << "month=";
    cin >> month;

  switch (month) {
        case 1:
        case 3:
        case 5 :
        case 7:
        case 8:
        case 10:
        case 12:
            days = 31;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            days = 30;
            break;
        case 2:
            if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
                days = 29;
            else
                days = 28;
  }
      cout << "days=" << days << endl;

while(表达式){
    循环体;
}

int s = 0, i = 1;
 while(i<100) {
           s += i;
           i++;
        cout<<"s="<<s<<",i="<<i<<endl;
       }

do{
    循环体
}while(表达式);


    int s = 0, i = 1;
    do{
           s += i;
          i++;
          cout<<"s="<<s<<",i="<<i<<endl;
    }while(i<100);

for(表达式1;表达式2;表达式3){
    循环体;
}

表达式1;
while(表达式2){
    循环体;
    表达式3;
}

// Fiboanacci斐波那契数列的前n项，形如0，1，1，2，3，5，8，13，21
int n,i,a0,a1,a2;
  cout<<"n=";
  cin>>n;
  a0=0;
  a1=1;
  cout<<a0<<'\t'<<a1<<'\t';
  for(i=3;i<=n;i++){
      a2=a0+a1;
      cout<<a2<<'\t';
      if(i%10==0){
          cout<<endl;
      }
      a0=a1;a1=a2;
  }

int i=1;
while(i<=10){
    i++;
    if(i==2){
        continue;
    }
      cout<<i<<'\t';
}
//3  4  5   6   7   8   9   10  11  

goto 标号；
标号:语句;

goto apple;
apple:{
    cout<<"apple"<<endl;
};