Thread: proplem searching runtime arguments

The program compiles fine but windows keeps giving me errors when I run the program:

Code:

while (t<=argc){
	  if (argv[t][0]=='-'){
		  printf("Found option");
	  }
	  t++;
  }

You've exceeded the array bounds....

try

Code:

while (t<argc){

consider:
C:\>prog A: -s -t

executes the job(prog) to the file or device A: with that options -s & -t.

for each [argc] is the number of arguments passed to prog; that are 3 (A:, -s, -t);

argv[argc] points to the first element of the argument. if argc is NULL the program name is not available,

so<?> :
consider t = 1,
argv[t] will point to the first elemet of "A:" string that's 'A'.

so if t increases t = 2, points the first element of "-s" that's '-'

use <string.h> functions to identify which letter was used after the dash('-') to apply the option

Thats the funny thing with array indexes ! If there are 5 elements you access them using ary[0] thru to ary[4] (0 to 4 makes the 5 elements).

So, the following defines and populates an array of 5 ints, with the values 10 - 14:

Code:

#define MAX_ELEMENTS 5

int ary[MAX_ELEMENTS];
int i;

for (i = 0; i < MAX_ELEMENTS; i++)
{
  ary[i] = i +10;
}

Also, the argc/argv combo people use with main includes the program name as the first element, then the command line args in the remainder. So if you're looking for switches (-t -i etc), you'd best start with argv[1], not argv[0].