C Programming and Numerical Analysis by Seiichi Nomura

Author:Seiichi Nomura
Language: eng
Format: epub
Publisher: Morgan & Claypool Publishers
Published: 2018-10-14T16:00:00+00:00

Instead of entering necessary information during the interactive session (using scanf() and printf() functions), you can enter necessary parameters at the same time you enter the program name as

$ gcc prog.c -lm -o prog

$ ./prog 3421 8756

(executes program to manipulate 3421 and 8756 and prints results)

This is called “command line arguments” (also called “command line parameters”) and provides a handy way to pass necessary arguments to the main() function without user interaction.

Recall that the function, main(), is the function in C that is to be executed first. Other than that, it is an ordinary function in C just like any other functions so that it must have an argument part. The function, main(), actually takes two arguments. The first argument is the number of command line arguments including the program name itself and the second argument (an array of strings) stores each command line argument entered after the program name. The syntax of the arguments in main() is

int main(int argc, char *argv[])

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