Final answer:
Without the program code, it's impossible to determine the number of child processes created; however, each call to fork() typically creates one child process.
Step-by-step explanation:
To determine how many child processes are created upon execution of a program, we need to analyze the source code, specifically looking for function calls that typically create new processes like fork() in UNIX/Linux systems. Unfortunately, since the program code is not provided in the question, it's impossible to provide an exact answer. Generally, when a process calls fork(), it creates a single child process; if fork() is within a loop or called multiple times in different parts of the program, more than one child process can be created. The resulting number of child processes depends on the number of times fork() is executed and whether there are any conditions that affect its execution.