1 #include <iostream> 2 using namespace std; 3  4 int main() 5 { 6     int a=1,b=100; 7     int f=1; 8     char c=0; 9 10     while(f<=7 && (b-a)>=1)11     {12         cout<<"你的数小等于"<<(a+b)/2<<"吗？(y/n)";13         cin>>c;14         if(c==‘n‘)15             a=(a+b)/2+1;16         else17             b=(a+b)/2;18         f++;19     }20     cout<<(a+b)/2<<endl;21     while (true);22 }

 1 #include "../../st.h" 2  3 int main() 4 { 5     int sum=0; 6     int i=1; 7     while(sum<1000) 8     { 9         int s=1;10         for(int n=1;n<i;n++)11             s*=2;12         sum+=s;13         i++;14     }15 16     cout<<"it is "<<i-1<<endl;17 18     while(1);19     return 0;20 }

 1 #include "../../st.h" 2 //要得到自然数n以内的全部素数，必须把不大于的所有素数的倍数剔除，剩下的就是素数。 3 const int  MAX=101; 4  5 int main() 6 { 7     int all[MAX]; 8     int N,i,j,s; 9    // memset(all,1,sizeof(all));10     for(i=0;i<MAX;i++)    //初始化11         all[i]=1;12 13     for(i=2;i<MAX;i++)     //倍数关系14         if(all[i])15             for(j=i+i;j<=MAX;j+=i)16                 all[j]=0;17     while(cin>>N)18     {19         for(i=2;i<=N;i++)20             if(all[i])21                 cout<<i<<"  ";22         cout<<endl;23     }24     return 0;25 }

 1 #include "../../st.h" 2 //学到后面这些都是小case= = 3 int main() 4 { 5     vector<int> all; 6     vector<int>    s; 7     vector<int> n; 8     int t; 9     while(cin>>t)10         all.push_back(t);11     sort(all.begin(),all.end());12     t=all[0];13     int k=0;14     for(int i=0;i<all.size();i++){15         if(t==all[i])16             k++;17         else18         {19             s.push_back(t);20             n.push_back(k);21             t=all[i];22             k=1;23         }24     }25     s.push_back(t);26     n.push_back(k);27     int max=0;28     for(t=0;t<n.size();t++)29         if(max<n[t])30             max=n[t];31     for(t=0;t<n.size();t++)32         if(n[t]==max)33             cout<<"the most number is "<<s[t]<<endl;34 35     while(1);36     return 0;37 }

 1 #include "../../st.h" 2  3 int main() 4 { 5     vector<string> names; 6     vector<double> scores; 7     string t; 8     double n; 9     int i;10     while(1)11     {12         cout<<"input name: ";13         cin>>t;14 15         if(t=="no"){16             cin>>t;17             break;18         }19         for(i=0;i<names.size();i++)20             if(names[i]==t){21                 cout<<"this is error";22                 exit(1);23             }24         names.push_back(t);25         cout<<"input scores:";26         cin>>n;27         scores.push_back(n);28 29     }30     for(i=0;i<names.size();i++)31         cout<<names[i]<<"-"<<scores[i]<<endl;32     cout<<endl;33 34     cout<<"input the name:";35     cin>>t;36     int f=0;37     for(i=0;i<names.size();i++)38         if(t==names[i]){39             f=1;40             break;41         }42     if(f==1)43         cout<<t<<"‘s score is "<<scores[i]<<endl;44     else45         cout<<"not found."<<endl;46 47     cout<<"input the score:";48     cin>>n;49     f=0;50     for(i=0;i<scores.size();i++)51         if(n==scores[i]){52             f=1;53             cout<<names[i]<<endl;54         }55     if(f==0)56         cout<<"score not found."<<endl;57 58     while(1);59     return 0;60 }