Having trouble developing this program, need help with an exec family call that passes an integer to another program

Develop a C program, named usecollatz.c, that asks the user to enter an integer between 1- 100, prints to the console "You entered n." (where n is the user provided integer) and then uses the forkl system call to create a child process that uses one of the exec0 family calls to load the previously developed collatz program passing it the user-entered integer n