How would I go about making an array of file pointers in C?
I would like to create an array of file pointers to the arguments of main... like a1.txt, a2.txt, etc... So I would run ./prog arg1.txt arg2.txt arg3.txtto have the program use these files.
Then the argument for main is char **argv
From argv, I would like to create the array of files/file pointers. This is what I have so far.
FILE *inputFiles[argc - 1];
int i;
for (i = 1; i < argc; i++)
inputFiles[i] = fopen(argv[i], "r");
The code is fine, but remember to compile in C99.
If you don't use C99, you need to create the array on heap, like:
FILE** inputFiles = malloc(sizeof(FILE*) * (argc-1));
// operations...
free(inputFiles);
#include <stdio.h>`
int main(int argc, char **argv)
{
FILE *inputFiles[argc - 1];
int i;
for (i = 1; i < argc; i++)
{
printf("%s\n",argv[i]);
inputFiles[i] = fopen(argv[i], "r");
printf("%p\n",inputFiles[i]);
}
return 0;
}
It prints different pointers for each file pointer along with the names. Allowing OS to close files properly :)
