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Example Program: Tabulation of sin function

The following example program tabulates values of the sin function, using manipulators to align the output neatly in columns. The for statement, which will be covered in Lesson 18, repeats the statements after it. In this case, i takes values 0, 1, 2, ... 16. 

// IEA Oct 1995
// Outputs a table of x and sin(x)
// Uses manipulators for output

#include <iostream.h>
#include <math.h>
#include <iomanip.h>

void main()
{
 float x;
 int i;
 cout << setiosflags(ios::fixed | ios::showpoint);
 for (i = 0; i <= 16; i++ )
   {
    x = 0.1 * i;
    cout << setprecision(1) << setw(4) << x;
    cout << setprecision(6) << setw(10) << sin(x) << endl;
   }
}
Download program.
produces nicely aligned tabular output as follows:
 0.0  0.000000
 0.1  0.099833
 0.2  0.198669
 0.3  0.295520
  .
  .
  .
 1.5  0.997495
 1.6  0.999574

Note how the iosflags were set at the beginning but that the precision and width were set individually in the cout stream output as required.


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