Help me write this program in C language

Program must meet the criteria below: 1. Program must be named createFile 2. Program must be able to be called in one of these two ways: 1. createFile 2. createFile > Command line arguments must represent the following: 1. - name of the binary file, if value isn't specified default it to image.dat 2. a ' - ' z '. 2. generate a random number between 5 and 20 3. store the values in a struct containing a char and a short int 4. output the struct to the file using write