Testing user input question?

This is a discussion on Testing user input question? within the C Programming forums, part of the General Programming Boards category; Originally Posted by Hoser83 This may be a dumb question, but what does the BUFSIZ mean. It that a default ...

  1. #16
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    Quote Originally Posted by Hoser83
    This may be a dumb question, but what does the BUFSIZ mean. It that a default thing?
    No, BUFSIZ is a user-defined constant. He wrote the code that way to tell you, the one taking the example, it's variable to whatever you want it to be.
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    so base 10 equals a decimal integer?

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    Yes. Do you understand the concept of bases, though? It's a basic computer concept that will be very essential in your progamming future.
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    Here is my entire code:

    I'm not able to use my compiler right now so I'm just trying to get close:

    My book has not gone over bases yet. That is why I'm sort of lost here.

    If this does work, how do I use what is in the string to get the correct number of random numbers printed. Right now, I use a for loop, but I don't know for sure how to use the for loop with the string.

    Code:
    #include <ctype.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    
    #define MAXLINE   100
    
    FILE *cfopen(char *filename, char *mode);
    
    FILE *gfopen(char *filename, char *mode);
    
    int main(void)
    {
         FILE  *ofp;
         int     i, line[MAXLINE];
         char  filename[120];
         char  *pEnd;
         long   1;     
    
        prinf("\n%S\n\n%s",
    	"This progam creates a file of random numbers.",
    	"Please enter in the number of random numbers
                      you would like to see as a positive integer.   "),
        fget( line, MAXLINE, stdin);
        
        if((l = strtol(line, &pEnd, 10)) <= 0 || *pEnd != '\n')
             {
                printf("\nERROR: Please enter positive integer.\n");
             }
        
         printf("\nIn what file would you like them?  ");
         scanf("%s", filename);
    
         ofp = cfopen(filename, "r+");
    
          
            
            for(i=1; i<=line; ++i){
               fprintf(ofp, "%12d", rand());
               if(i%6 == 0 || i == n)
                  fprintf(ofp, "\n");
         }
    }
    
    
    
    
    
    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;
    }
    Last edited by Hoser83; 02-15-2006 at 03:04 PM.

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