Arrays in String:

Use a [] to tell that it's an array, like: string s[] means "s" is an array of strings.

Arrays can be any types, like int a[] or float b[]

We can use the string array in "main" function, so that we can give "main" function 2 inputs.

Instead of "int main(void)", we can say:

int main(int argc, string argv[]) // "argc" is the total number of words user typed, and "argv[]" are the array of all the words that user typed

so we can add some input after the program name, and then there will be some output:

int main(int argc, string argv[])

{

	if (argc == 2) // if there are 2 words in input

	{

		printf("hello, %s\n", argv[1]); // print out the second inputed word

	}

	else

	{

		printf("hello world.\n");

	}
}

So after the compile: make argv0

if we type ./argv0

The output will be:

hello, world

if we type ./argv0 David

The output will be:

hello, David