C++ 实验一

女爷i 2021-12-18 05:11 243阅读 0赞

2-28：

\#include <iostream>  
using namespace std;  
int name()  
\{  
 char n;  
 cout << "Menu:A(dd) D(elete) S(ort) Q(uit),Select one:" << endl;  
 cin >> ;  
 while (n != 'Q')  
 \{  
  switch (n)  
  \{  
  case'A':  
  \{  
   cout << "The date has been added" << endl; break;  
  \}  
  case'D':  
  \{  
   cout << "The data has been deleted" << endl; break;  
  \}  
  case'S':  
  \{  
   cout << "The data has been sorted" << endl; break;  
  \}  
  \}  
  cin >> n;  
 \}  
 system("pause");  
 return 0;  
\}

\#include<iostream>  
using namespace std;  
int main()  
\{  
 char n;  
 cout << "Menu:A(dd) D(elete) S(ort) Q(uit),Selectone :" << endl;  
 cin >> n;  
 while (n != 'Q')  
 \{  
  if (n == 'A')  
  \{  
   cout << "The data has been added" << endl;  
  \}  
  if (n == 'D')  
  \{  
   cout << "The data has been deleted" << endl;  
  \}  
  if (n == 'S')  
  \{  
   cout << "The data has been sorted" << endl;  
  \}  
  cin >> n;  
 \}  
 system("pause");  
 return 0;  
\}

![1625548-20190319214503387-233879280.png][]

2-29：

\#include<iostream>  
\#include<cmath>  
using namespace std;  
int main()  
\{  
 int i, j, k, flag;  
 i = 2;  
 while (i <= 100)  
 \{  
  flag = 1;  
  int k = (int)sqrt((float)i);  
  j = 2;  
  while (j <= k)  
  \{  
   if (i%j == 0)  
   \{  
    flag = 0; break;  
   \}  
   j++;  
  \}  
  if (flag)  
   cout << i << "为质数。" << endl;  
  i++;  
 \}  
 system("pause");  
 return 0;  
\}

\#include <iostream>  
\#include <cmath>  
using namespace std;  
int main()  
\{  
 int i, j, k, flag;  
 i = 2;  
 do \{  
  flag = 1;  
  int k = (int)sqrt((float)i);  
  j = 2;  
  do \{  
   if (i%j == 0)  
   \{  
    flag = 0; break;  
   \}  
   j++;  
  \} while (j <= k);  
  if (flag)  
   cout << i << "为质数。" << endl;  
  i++;  
 \} while (i <= 100);  
  system("pause");  
  return 0;  
\}

\#include<iostream>  
\#include<cmath>  
using namespace std;  
int main()  
\{  
 int i, j, k, flag;  
 for (i = 2; i <= 100; i++)  
 \{  
  flag = 1;  
  int k = (int)sqrt((float)i);  
  for (j = 2; j <= k; j++)  
  \{  
   if (i%j == 0)  
   \{  
    flag = 0; break;  
   \}  
  \}  
  if (flag)  
   cout << i << "为质数。" << endl;  
 \}  
 system("pause");  
\}

![1625548-20190319222913818-1491276180.png][]

2-32：

\#include<iostream>  
\#include<stdlib.h>  
\#include<time.h>  
using namespace std;  
int main()  
\{  
 int x;  
    srand(time(0));  
    int number = rand() % 100 + 1;  
    cout << "猜这个数: ";  
    cin >> x;  
 while (1)  
 \{  
  if (x != number)  
  \{  
   if (x < number)  
   \{  
    cout << "小" << endl;  
   \}  
   else  
   \{  
    cout << "大" << endl;  
   \}  
  \}  
  else  
  \{  
   cout << "正确" << endl; break;  
  \}  
  cin >> x;  
 \}  
 system("pause");  
 return 0;  
\}

![1625548-20190319224102213-529402626.png][]

\#include<iostream>  
\#include<stdlib.h>  
\#include<time.h>  
using namespace std;  
int main()  
\{  
 int x;  
    srand(time(0));  
    int number = rand() % 100 + 1;  
    cout << "猜这个数: ";  
    cin >> x;  
 do  
 \{  
  if (x != number)  
  \{  
   if (x < number)  
   \{  
    cout << "小" << endl;  
   \}  
   else  
   \{  
    cout << "大" << endl;  
   \}  
  \}  
  else  
  \{  
   cout << "正确" << endl; break;  
  \}  
  cin >> x;  
 \} while (1);  
 system("pause");  
 return 0;  
\}

![1625548-20190319224345267-1263734580.png][]

2-34:

\#include<iostream>  
\#include<iomanip>  
using namespace std;  
void ball(int a)  
\{  
 switch (a)  
 \{  
 case 1:cout << "red "; break;  
 case 2:cout << "yellow "; break;  
 case 3:cout << "blue "; break;  
 case 4:cout << "white "; break;  
 case 5:cout << "black "; break;  
 \}  
\}  
int main()  
\{  
 int i, j, k, n = 0;  
 for (i = 1; i <= 5; i++)  
 \{  
  for (j = i + 1; j <= 5; j++)  
  \{  
   for (k = j + 1; k <= 5; k++)  
   \{  
    ball(i);  
    ball(j);  
    ball(k);  
    cout << endl;  
    n++;  
   \}  
  \}  
 \}  
 cout << "number：" << n << endl;  
 system("pause");  
 return 0;  
\}

![1625548-20190319225516415-1120980461.png][]

转载于:https://www.cnblogs.com/sora5934/p/10562100.html

[1625548-20190319214503387-233879280.png]: /images/20211218/0fa54c5ec7824b008d259573fe957df5.png
[1625548-20190319222913818-1491276180.png]: /images/20211218/73a02a661dc14b7299f332ff1453a372.png
[1625548-20190319224102213-529402626.png]: /images/20211218/3ccbe3d7836044708d0971eb309b672e.png
[1625548-20190319224345267-1263734580.png]: /images/20211218/d696ff56142b4f209fa99eec1bab4d44.png
[1625548-20190319225516415-1120980461.png]: /images/20211218/3fb3849ba48e4af482abf36947990dde.png