c++实验1

 1 #include<iostream>
 2 #include<stdlib.h>
 3 using namespace std;
 4 int main(){
 5     char a;
 6     while(true){
 7     cout<<"Menu:A(dd) D(elet) S(ort) Q(uit),Select one:";
 8     cin>>a;
 9         if(a==‘A‘||a==‘D‘||a==‘S‘){
10             switch(a){
11                 case ‘A‘:cout<< "data has been added"<<endl;break;
12                 case ‘D‘:cout<< "data has been deleted"<<endl;break;
13                 case ‘S‘:cout<< "data has been sorted"<<endl;break;
14             }
15         }
16         else if(a==‘Q‘) break;
17         else cout<< "no such choice"<<endl;
18     }
19     exit(0);
20     return 0;
21 }

 1 #include<iostream>
 2 #include<stdlib.h>
 3 using namespace std;
 4 int main(){
 5     char a;
 6     while(true){
 7     cout<<"Menu:A(dd) D(elet) S(ort) Q(uit),Select one:";
 8     cin>>a;
 9         if(a==‘A‘)
10             cout<< "data has been added"<<endl;
11         else if(a==‘D‘)
12             cout<< "data has been deleted"<<endl;
13         else if(a==‘S‘)
14             cout<< "data has been sorted"<<endl;
15         else if(a==‘Q‘) 
16             break;
17         else 
18             cout<< "no such choice"<<endl;
19     }
20     exit(0);
21     return 0;
22 }

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std;
 4 int main(){
 5     int i,j,k=0;
 6     for(i=2;i<=100;i++){
 7         int m=0;
 8         for(j=2;j<i;j++)
 9             if(i%j==0)m++;
10             if(m==0){
11                 cout<<setw(6)<<i;
12                 k++;
13             }
14             if(k==4){
15                 k=0;
16                 cout<<endl;
17             }
18         }
19 
20     return 0;
21 }

 1 #include<iostream>
 2 using namespace std;
 3 int main(){
 4     int num=78;
 5     cout<<"choose one number between 1 and 100"<<endl;
 6     while(true){
 7         int gesn;
 8         cin>>gesn;
 9         if(gesn==num){
10             cout<<"you got it,congratulations!"<<endl;break;
11         }
12         else if(gesn>num)
13             cout<<"this number is too big,pls try again"<<endl;
14         else if(gesn<num)
15             cout<<"this number is too small,pls try again"<<endl;
16     }
17     return 0;
18 }

 1 #include<iostream>
 2 using namespace std;
 3 int combine(int,int);
 4 int main(){
 5     cout<<"有"<<combine(3,5)<<"种取法"<<endl;
 6     return 0;
 7 }
 8 int combine(int x,int y){
 9     int i,j=1;
10     for(i=1;i<=y;i++)
11         j*=i;
12     for(i=1;i<=x;i++)
13         j/=i;
14     for(i=1;i<=y-x;i++)
15         j/=i;
16     return j;
17 }

 1 #include<iostream>
 2 #include<string.h>
 3 #include<iomanip>
 4 using namespace std;
 5 int main(){
 6     char a[5][10];
 7     strcpy(a[0],"red");
 8     strcpy(a[1],"yellow");
 9     strcpy(a[2],"blue");
10     strcpy(a[3],"white");
11     strcpy(a[4],"black");
12     int i,j,k,num=0;
13     for(i=0;i<5;i++){
14         for(j=0;j<5;j++){
15             if(j==i)
16                 continue;
17             for(k=0;k<5;k++){
18                 if(k==i||k==j)
19                     continue;
20                     cout<<setw(7)<<a[i];
21                     cout<<setw(7)<<a[j];
22                     cout<<setw(7)<<a[k]<<endl;
23                     num++;
24             }
25         }
26     }
27     cout<<num<<endl;
28     return 0;
29     
30 }