Figure 1


Sample output from the program in Listing One.

ping PONG ping ping PONG ping ping ping PONG ping  
ping PONG ping ping ping PONG ping ping PONG ping  
ping ping PONG ping ping ping PONG ping ping PONG  
ping ping ping PONG ping ping ping PONG ping ping  
PONG ping ping ping PONG ping ping ping PONG ping  
ping ping PONG ping ping PONG ping ping ping PONG ...