check my mistakes and tell me please

iamuser2007 (33)
Hi programmers
please check code and tell me my error
why is it not showing values on input of some numbers.

Write a program in C++ that computes the minimal and the maximal value of function f(x,y) obtained on an integer point in a given rectangle [a, b] x [c, d]. Your program should prompt the user to input numerical values of a, b, c and d, as floating point numbers, which are expected to be in a range from -100 thru 100. In case when minimal or maximal values do not exists, your program should output appropriate messages.
a=1, b=10, c=1, d=-20, f(x,y)=2-x+7*x*x-x*x*x;


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#include <iostream>
using namespace std;
 
int main()
{
 double a,b,c,d,x,y,f;
 int min=0;
 int max=0;
 
 cout<<"Please, enter values for a,b,c and d:"<<"\n";
 cout<<"a = ";
 cin>>a;
 
 cout<<"b = ";
 cin>>b;
 
 cout<<"c = ";
 cin>>c;
 
 cout<<"d = ";
 cin>>d;
if (a>100 || b>100 || c>100 || d>100 || a<-100 || b<-100 || c<-100 || d<-100)
{
cout << "Bad input. The numbers must be in the interval [-100, 100] ";
}
else
 {
      for ( x=a; x<=b; x=x+0.01)
           {
            for ( y=c; y<=d; y=y+0.01)
 
                  f=2-x+7*x*x-x*x*x;
                  if (min>f) f=min;
                  if (max<f) f=max;
                  cout<<"f = "<<f<<"\n";
 
 
          }
 }
 
 
 
 
 
 cout << "f(min) = " << min << "\n";
 cout << "f(max) = " << max << "\n";
 
 return 0;
}


i am waiting
Browni3141 (578)
I not exactly sure what you're asking, but this looks wrong:
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                  if (min>f) f=min;
                  if (max<f) f=max;

I think it ought to be 'min = f' rather than 'f = min'
Last edited on
PanGalactic (1658)
I recommend all programmers adopt a fanatical devotion to unit testing and test-driven development.
iamuser2007 (33)
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#include <iostream>
using namespace std;
 
int main()
{
 double a,b,c,d,x,y,f;
 int min=0;
 int max=0;
 
 cout<<"Please, enter values for a,b,c and d:"<<"\n";
 cout<<"a = ";
 cin>>a;
 
 cout<<"b = ";
 cin>>b;
 
 cout<<"c = ";
 cin>>c;
 
 cout<<"d = ";
 cin>>d;
if (a>100 || b>100 || c>100 || d>100 || a<-100 || b<-100 || c<-100 || d<-100)
{
cout << "Bad input. The numbers must be in the interval [-100, 100] ";
}
else
 {
      for ( x=a; x<=b; x=x+0.01)
           {
            for ( y=c; y<=d; y=y+0.01)
 
                  f=2-x+7*x*x-x*x*x;

                  cout<<"f = "<<f<<"\n";
 
 
          }
 } 
 cout << "f(min) = " << min << "\n";
 cout << "f(max) = " << max << "\n";
 
 return 0;
}



not showing correct errors.

please any one can check ......
ne555 (10692)
not showing correct errors.
What? Oxymoron.

Double thread http://www.cplusplus.com/forum/general/34319/
Last edited on
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