How to use cout formatting statements to print the input and output in proper format?

Question

I have a 2d array which stores numbers for Maths and Chemistry for X number of sets. Below is how I take input for each class and store them in 2d array for each class.

Input for Maths class:
50 20 30 40 50

Input for Chemistry class:
90 70 20 10 40

• Now basis on above input for each class I need to calculate "BEST", "WORSE" and "AVERAGE" number.
• Also I need to calculate average for each set (out of 5) for both "Math" and "Chemistry" class and then come up with overall average here as well.

Once I take above input for Math and Chemistry class, I need to print like this in below format which will have data for point 1 and 2 above along with the input-

             1     2     3     4     5    
            *****************************
Math        50.00 20.00 30.00 40.00 50.00 
Chemistry   90.00 70.00 20.00 10.00 40.00

Problem Statement

I am able to do all above things and calculate point 1 and 2 easily but I am not able to figure out on how to print output in the above format which can show input and ouput in properly formatted way. As of now my program prints everything separately along with the output in different line after taking input -

int main()
{
    double val[2][5];
    //.. val array being populated


    return 0;
}

How can I use cout.setf(ios::fixed) , cout.setf(ios::showpoint) and cout.precision(2) and cout.width(4); in my above code to get the formatting I need?

Answer 1

This could be a way:

auto w = std::setw(6);   // for number like " 10.00" (6 chars)
auto wb = std::setw(8);  // for the numbers with more space between them
auto sw = std::setw(11); // for titles (math, chemistry)

// print the numbers above
cout << "         ";
for(int i=1; i<=5; ++i) std::cout << w << i;
std::cout << "     BEST    WORST  AVERAGE\n";

// print a line of *
std::cout << sw << "" << std::string(56,'*') << '\n';

cout << std::setprecision(2) << std::fixed; // precision 2, fixed

cout << sw << std::left << "Math" << std::right;
for(auto ms : array[0]) std::cout << w << ms;
cout << wb << math_best << wb << math_worse << wb << math_average << '\n';

cout << sw << std::left << "Chemistry" << std::right;
for(auto cs : array[1]) std::cout << w << cs;
cout << wb << chemistry_best <<  wb << chemistry_worse << wb << chemistry_average << '\n';

Output

              1     2     3     4     5     BEST    WORST  AVERAGE
           ********************************************************
Math        50.00 20.00 30.00 40.00 50.00   50.00   20.00   38.00
Chemistry   90.00 70.00 20.00 10.00 40.00   90.00   10.00   46.00