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As it stands, the switch statement in the analyze_trades
program displays a message when it encounters an unknown industry code.
You may choose to have the program take more drastic action, however, such
as terminating whenever it encounters an unknown industry code. To arrange
for an orderly termination, you need to inform the C compiler that you
intend to make use of the exit function by including the
following line in your program:
#include
Then, you can insert a call to the exit function after the warning
is displayed:
switch (industry) {
case 1: case 5:
...
case 0: case 2: case 3: case 4: break;
default: printf ("Industry code %i is unknown!\n", industry);
exit (0);
}
Note that exit expects an integer argument. That integer argument
generally should be 0, thereby indicating that your program's
termination is not to evoke a special reaction from your operating system.