C Primer Plus®, Third Edition

Programming Exercises

1. Start developing a header file of preprocessor definitions that you want to use.

2. The harmonic mean of two numbers is obtained by taking the inverses of the two numbers, averaging them, and taking the inverse of the result. Use a #define directive to define a macro "function" that performs this operation. Write a simple program that tests the macro.

3. Polar coordinates describe a vector in terms of magnitude and the counterclockwise angle from the x-axis to the vector. Rectangular coordinates describe the same vector in terms of x and y components (see Figure 16.3). Write a program that reads the magnitude and angle (in degrees) of a vector and then displays the x and y components. The relevant equations are these:

   Figure 16.3. ...