COMP202 - Week02 - Stage 2

This stage develops the following specific skills:

• Reading binary data
• Opening and closing files
• Printing various data types using printf.
• Using a simple command-line parameter.

Knowledge and Experience

• reading a binary file with passed parameter 
• int main(int argc, char *argv[])
• after compile file, call the execution
• ex: ./stage2 input-2.bin
• argc must be 2, if not, print error by fprint(stderr, "message")
• argv[0]: stage2
• argv[1]: input-2.bin
•  read the file and set it to the file pointer
• FILE *fp = fopen(filename, "rb"); //r: read, b: binary
• pass filename by argv[1]
• check fp is null or not
• if not, print out error by fprinpt
• How to read binary data from start to end
• function: fread - http://www.cplusplus.com/reference/cstdio/fread/
• while( fread((void *)&initStruct.geese, sizeof(initStruct.geese), 1, fp) != 0 ) 
• stop when eof
• Print long integer - most important
• use "%ld"