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Is it possible to declare global variables within a function?

I have an array MyArray[100,total_entries] but 'total_entries' is only initialized after the application starts running and its value...

I've come across += and -= and have no clue as to what they do, and I cant find any tutorials either. Can anyone explain?

EDIT: I've also noticed some code..



if (i)
{ etc etc etc }

int input(char * dest, FILE * inputStream, const char tochar)
/*
INPUT gets characters from a stream until the character specified in 'tochar' is reached OR until the entire
return string 'dest'...

Oh I didnt notice that!
I changed it to 'w'.

Anyway, Im really new to C so can you tell me exactly what I need to use?

Thanx in advance

I opened a file in my main() function like this

FILE *myfile = fopen("myfile.txt","r");

I want to use the file for input in another function called writeData.

How do I pass the file pointer...