c++循环、continue、排序、goto以及猜数字小游戏

#include<iostream>
using namespace std;
#include<string.h>
int main(){
  for(int i=1;i<=9;i++){
  for(int j=1;j<i;j++){
    cout<<j<<"*"<<i<<"="<<j*i<<" ";
  }
  cout<<endl;
  }
  system("pause");
}

#include<iostream>
using namespace std;
#include<string.h>
int main(){
  for(int i=0;i<=100;i++){
  if(i%2==0){
    continue;
  }
  cout<<i<<endl;
  }
  system("pause");
}

#include<iostream>
using namespace std;
int main(){
  int arr[9]={4,2,8,0,5,7,1,3,9};
  cout<<"排序前："<<endl;
  for (int i=0;i<9;i++){
  cout<<arr[i]<<" ";
  }
  cout<<endl;
  for(int i=0;i<9-1;i++){
  for(int j=0;j<9-i-1;j++){
    if(arr[j]>arr[j+1]){
    int temp=arr[j];
    arr[j]=arr[j+1];
    arr[j+1]=temp;
    }
  }
  }
  for (int i=0;i<9;i++){
    cout<<arr[i]<<" ";
  }
  system("pause");
}

#include<iostream>
using namespace std;
#include<ctime>
int main(){
srand((unsigned int)time(NULL));
int num=rand()%100+1;
int val=0;
while(1){
  cin>>val;
  if(val>num)cout<<"猜测过大"<<endl;
  else if(val<num)cout<<"猜测过小"<<endl;
  else{
  cout<<"恭喜您猜对了"<<endl;
  break; 
  } 
}
  system("pause");  
}

#include<iostream>
using namespace std;
int main(){
  cout<<"1、xxxx"<<endl;
  cout<<"2、xxxx"<<endl;
  goto FLAG;
  cout<<"3、xxxx"<<endl;
  cout<<"4、xxxx"<<endl;
  FLAG:
  cout<<"5、xxxx"<<endl;
  system("pause");
}