Thread: Creating a file with random numbers question??

Hey guys. I need some help..bad. I have to write a program that creates a file of randomly distributed numbers. I have the functions figured out and some of the main(). Could you guys take a look at it and just try to steer me in the right direction. I'm just confused on how to get a filename from user, and how many numbers they want to see, then acutally do it. I just need some help getting started.

Heres the code:

Code:

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>

void get_info(char *filename, int *n_ptr);

FILE *cfopen(char *filename, char *mode);

FILE *gfopen(char *filename, char *mode);

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

       // I don't know if I've declared all that I should, and I'm not
       // sure how to call the functions.



       for(i=1; i<=n; ++i){
           fprintf(ofp, "%12d", rand());
           if(i%6 == 0 || i == n)
              fprintf(ofp, "\n");
}


void get_info(char *filename, int *n_ptr)
{
    prinf("\n%S\n\n%s",
	"This progam creates a file of random numbers.",
	"How many random numbers would you like?   "),
    scanf("%d", n_ptr);
    printf("\nIn what file would you like them?  ");
    scanf("%s", filename);
}




FILE *cfopen(char *filename, char *mode)
{
    char  reply[2];
    FILE  *fp;
 
    if(strcmp(mode, "w") == 0
      && (fp = fopen(filename, "r")) != NULL){
        fclose(fp);
	printf("\nFile exists.  Overwrite it? ");
        scanf("%1s", reply);
        if(*reply != 'y' && *reply != 'Y') {
        printf("\nBye!\n\n");
	exit(1);
	}
      fp = gfopen(filename, mode);
      return fp;
}



FILE *gfopen(char *filename, char *mode)
{
    FILE *fp;
    
    if((fp = fopen(filename,mode)) == NULL){
    fprintf(stderr, "Cannot open %s - bye!\n", filename);   
    exit(1);
    }
    return fp;
}

Any help would be greatly appreciated!!!!!