New C learner need help on a syntax question

I have read the Cprogramming.com to learn C, but I am facing a basic syntax problem.

I need to write a very simple program (mult). It need take a command line input in cmd.exe

For example: mult 2 3 abc.txt

Then the program will calculate 2*3 and then save the result in abc.txt.

I know how to do it if 2,3 and abc.txt are not input variables, but I don't know how to do it now.

Please help

===============================

I just read more from Cprogramming.com Tutorial: Command-Line Arguments

I will try it first, but I would still be very happy if someone gives me an example.

Lookup atoi or strtol for converting the command line strings into numbers.
Lookup fopen for opening a file.
Lookup fprintf for writing to a file.

Feel free to post your code if you want more in depth help.

Command-line input will be accessible in the program as argv[1], argv[2], argv[3], argv[4] containing "mult", "2", "3", "abc.txt" respectively. As long as these parameters are separated by spaces and contain no spaces themselves there is no syntax problem.

Quote:

---

Originally Posted by nonoob

Command-line input will be accessible in the program as argv[1], argv[2], argv[3], argv[4] containing "mult", "2", "3", "abc.txt" respectively. As long as these parameters are separated by spaces and contain no spaces themselves there is no syntax problem.

---

Actually that would be argv[0], argv[1], argv[2] and argv[3] ... I'm betting mult is the program name.

You may be right. He did mention "mult" is program name. I was hoping increased flexibility would allow use of "mult", "add", "subtract" etc., towards a more general calculator. I also got confused with the mention of cmd.exe - as if that could be his program. I realize it's also the name the command processor.

Quote:

---

Originally Posted by nonoob

You may be right. He did mention "mult" is program name. I was hoping increased flexibility would allow use of "mult", "add", "subtract" etc., towards a more general calculator. I also got confused with the mention of cmd.exe - as if that could be his program. I realize it's also the name the command processor.

---

Ahhh man... I've had days like that, too ... bummer :D