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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int main()
  5. { float q, t, r, u, x, x1, x2,n1,e1,w,tg,te;
  6.  float p1 = 981,g = 9.794,l = 2.00e-3,b = 8.22e-3,P = 0.1013e6,d = 5.00e-3,n = 1.83e-5,c=1.602e-19; 
  7.  cout<<"先输入下降时间,再输入上升时间，再输入上升时的电压:"<<endl;
  8.  cin >> tg>>te>>u;
  9.  r = sqrt(9 * n*l / (2 * p1*g*tg)); 
  10.  x=sqrt((n*l)/(1+b/(P*r)));
  11.  q = ((18*3.14)/sqrt(2*p1*g))*x*x*x*(d/u)*(1/tg+1/te)*sqrt(1/tg);
  12.  n1=q/(1.602e-19);
  13.  if(n1-int(n1)>=0.5)  
  14.  {        
  15. 	 n1=int(n1)+1;    
  16. }    
  17.  else if(n1-int(n1)<0.5||n1-int(n1)>=0)   
  18.  {       
  19. 	 n1=int(n1);  
  20.   }   
  21.  else   
  22.  {       
  23. 	 cout<<"error";  
  24.   }    
  25.  e1=q/n1; 
  26.  w=(e1-c)/c;
  27.  if(w<0)
  28. 	 w=0-w;
  29.  else
  30. 	 w=w;
  31.  cout<< "半径r=   "<<r <<endl;
  32.  cout<<"油滴带电量q=   "<< q<<endl; 
  33.  cout<<"油滴所带基本电荷n=   "<<n1<<endl;
  34.  cout<<"基本电荷带电量e=   "<<e1; 
  35.  printf("\n");
  36.  printf("相对误差=   %lf\n",w);
  37.  return 0;
  38. }
Success #stdin #stdout 0.01s 5432KB
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先输入下降时间,再输入上升时间，再输入上升时的电压:
error半径r=   -nan
油滴带电量q=   -nan
油滴所带基本电荷n=   -nan
基本电荷带电量e=   -nan
相对误差=   -nan
https://ideone.com/5Ytw8x
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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