Casting question

[stevebiks]

Oaky bear with me cause i am very new to C however i know a bit of java.

I am trying to test out reading parametes from the command line, anyway they read in as character strings initially right? I want to read in a number, lets say 20. So anyway i want to save it as an int so i can manipulate later. i figured with this i would read it in as an array jsut cause the argv is an array too and it would be easier. here is what i worte to try and test it out. I read stuff in and the array comes out as NULL, but when i comment out my attempt at casting it outputs the everything just fine. any info or advice??

CODE::::

#include <stdio.h>

main(int argc, char** argv)
{
int i;

int array[4]; /* my array for storing as ints*/

printf("argc = %d\n", argc);

for (i = 0; i < argc; i++)
array=(int) argv; /* my attempt at casting*/


printf("argv[%d] = \"%s\"\n", i, argv);
}

Thanks in advance!!!!

 

[oppcos]

In C, operators such as = are very simplistic and don't handle type conversions for you. The integer takes up a completely different amount of memory than the character string and trying to cast it is only taking an integer sized chunk of the data and converting it raw into the int variable. To convert the ASCII text into a number, use a function such as atoi().

array[i] = atoi(argv[i]);

 

[stevebiks]

Thanks a lot!!! that helps and your explaination helps me understand why. I really really appreciate it!!
-stevebiks