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  1. #include <iostream>
  2.  
  3. #include <math.h>
  4.  
  5.  
  6.  
  7. using namespace std;
  8.  
  9.  
  10.  
  11. int main()
  12.  
  13. {
  14.  
  15.    float c;
  16.  
  17.  
  18.  
  19.     while(cin>>c){
  20.  
  21.               int i;
  22.  
  23.               int c1=(int)c;
  24.  
  25.               int Count=sqrt(c);
  26.  
  27.  
  28.  
  29.                if(c1==1)
  30.  
  31.                {           
  32.  
  33.                    cout<<"非質數"<<endl; 
  34.  
  35.                    continue;
  36.  
  37.                }            
  38.  
  39.               if(c1==2)
  40.  
  41.                {    
  42.  
  43.                 cout<<"質數"<<endl;
  44.  
  45.                 continue;
  46.  
  47.                }
  48.  
  49.               for(i=2;i<Count+1;i++)
  50.  
  51.               {
  52.  
  53.                 if(c1%i==0)
  54.  
  55.                 {
  56.  
  57.                   cout<<"非質數"<<endl;      
  58.  
  59.                   break; 
  60.  
  61.                 }            
  62.  
  63.                }             
  64.  
  65.               if(i==Count+1)
  66.  
  67.               {
  68.  
  69.                cout<<"質數"<<endl;     
  70.  
  71.               }
  72.  
  73.        }
  74.  
  75.  
  76.  
  77.     return 0;
  78.  
  79. }
  80.  
  81.  
Success #stdin #stdout 0.01s 2724KB
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https://ideone.com/YzDn3X
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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