Question

9. #include <fstream>
#include <iostream>
using namespace std;

int main()
{
    float bmi;
    ifstream inFile;
    inFile.open("bmi.txt");

    while (!inFile.eof())
      {
         inFile >> bmi;
         if( bmi < 18.5)
          {
              cout << bmi << " is underweight " ;
          }
        else if( bmi >= 18.5 && bmi <= 24.9)
          {
              cout << bmi << " is in normal range " ;
          }
        else if( bmi >= 25.0 && bmi <= 29.9)
          {
              cout << bmi << " is overweight " ;
          }
        else if( bmi >= 30)
          {
              cout << bmi << " is obese " ;
          }
        cout << endl;
     }
   return 0;
}

bmi.txt looks like below:

25.0

17.3

23.1

37.0

What will be the output when the above code runs with the above bmi.txt file.

Answer 1

Here is the solution to above problem in C++. Please read the code comments for more information

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Explanation

1) inFile.open will open the file bmi.txt

2) while(!inFile.eof()) will execute the code till the end of of bmi.txt is reached and inFile>>bmi will read a float value from bmi.txt one at a time

3) after that if condition is executed based on the value in the file

4) the first value in bmi.txt is 25 hence overweight is printed , second value is 17.3 hence underweight is printed

5) For 23.1 normal weight is printed , last value is 37.0 hence obese is printed

6) Note that the last value in bmi.txt is printed twice

C++ Code

#include <fstream>
#include <iostream>
using namespace std;

int main()
{
float bmi;
ifstream inFile;
inFile.open("bmi.txt");

while (!inFile.eof())
{
inFile >> bmi;
if( bmi < 18.5)
{
cout << bmi << " is underweight " ;
}
else if( bmi >= 18.5 && bmi <= 24.9)
{
cout << bmi << " is in normal range " ;
}
else if( bmi >= 25.0 && bmi <= 29.9)
{
cout << bmi << " is overweight " ;
}
else if( bmi >= 30)
{
cout << bmi << " is obese " ;
}
cout << endl;
}
return 0;
}

Screenshot of output