.10 .20 .15 .34 .12 .05 .12 .56 .65 .21 .98 .02 .36 .03 2. Write a C++ program n

Question

.10
.20
.15
.34
.12
.05
.12
.56
.65
.21
.98
.02
.36
.03


2. Write a C++ program named xxxxpa1.cpp (where xxxx is your UBIT name) that does the following:

a. Asks the user, with a message to the screen, how many numbers to read from the data file.

b. The user inputs a number with the keyboard.

c. If the number is not greater than 0 and not less than or equal to 14, the program prints an error message and continually asks the user for a new number until a number between 1 and 14 is entered. You must use a while loop to accomplish this.

d. In a for loop the program:
1. Reads a number x from the file.
2. If x is less than 0.1, the program calculates the value of f(x)=x*x+sin(x)
3. If x is less than 0.5 and greater than or equal to 0.1, the program calculates the value of f(x) = x*x + cos(x).
4. If x is greater than or equal to 0.5, the program calculates the value of f(x) = x*x + tan(x)

e. Prints the sum of the x values read and the sum of the f(x) values calculated to the screen and to a file named results.txt.

Explanation / Answer

please rate - thanks

#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
int main()
{ifstream in;
ofstream out;
int n,i;
double x,fx,xsum=0,fxsum=0;
cout<<"How many numbers in your file? ";
cin>>n;
while(n<=0||n>14)
   {cout<<"must be between 1 and 14! ";
   cin>>n;
   }
in.open("input.txt");
if(in.fail())           
       { cout<<"input file did not open please check it ";
        system("pause");
        return 1;
        }
cout<<"x f(x) ";
for(i=0;i<n;i++)
   {in>>x;
   if(x<.1)
      fx=sin(x);
   else if(x<.5)
      fx=cos(x);
   else
      fx=tan(x);
   fx+=(x*x);
   cout<<x<<" "<<fx<<endl;
   xsum+=x;
   fxsum+=fx;
}
cout<<endl;
out.open("result.txt");
cout<<"sum of x:    "<<xsum<<endl;
cout<<"sum of f(x): "<<fxsum<<endl;
out<<"sum of x:    "<<xsum<<endl;
out<<"sum of f(x): "<<fxsum<<endl;       
in.close();
out.close();
system("pause");
return 0;
}

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