Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

variable-length array?

Posted on 2002-03-06
4
236 Views
Last Modified: 2010-04-01
What's wrong with this short program, and how do I make it work? (I do not want to fix/limit the size of the array to 10000.)

Thanks.
---------------
#include <stdio.h>
#include <stdlib.h>

void main(int argc, char** argv){
//  char content[10000];
  if(argc<3){
     printf("Usage: \n       sendfile number_of_bytes file_name\n");
     exit(0);
  }

  FILE* fout=fopen(argv[2],"w");
  int num=atoi(argv[1]);
int * size=(int *)malloc((size_t)num);
char content[*size];
  for(int i=0; i<num; i++)content[i]='a';
  fwrite(content,1,num,fout);
free(size);
}
0
Comment
Question by:anothercto
  • 2
4 Comments
 
LVL 4

Accepted Solution

by:
pagladasu earned 100 total points
ID: 6844788
char *content=(char *)malloc(num);
0
 
LVL 6

Expert Comment

by:thienpnguyen
ID: 6844803
#include <stdio.h>
#include <stdlib.h>


void main(int argc, char **argv)
{
    //  char content[10000];
    if(argc < 3)
    {
        printf("Usage: \n       sendfile number_of_bytes file_name\n");
        exit(0);
    }
    FILE * fout = fopen(argv[2], "w");

    if( fout == NULL )
        return;
   
    int       num = atoi(argv[1]);
    char *content = (char *)malloc(num*sizeof(int));

    if( content == NULL )
        return;
   
    for(int i = 0; i < num; i++)
        content[i] = 'a';
    fwrite(content, 1, num, fout);

    free(content);
    fclose(fout);
}

0
 
LVL 6

Expert Comment

by:thienpnguyen
ID: 6844806
if you write in "pure" C, the code as following.


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


void main(int argc, char **argv)
{
    FILE * fout;
    int    num, i;
    char *content;

   
    //  char content[10000];
    if(argc < 3)
    {
        printf("Usage: \n       sendfile number_of_bytes file_name\n");
        exit(0);
    }

    fout = fopen(argv[2], "w");
    if( fout == NULL )
        return;
   
    num = atoi(argv[1]);
    content = (char *)malloc(num*sizeof(int));

    if( content == NULL )
        return;
   
    for(i = 0; i < num; i++)
        content[i] = 'a';
    fwrite(content, 1, num, fout);

    free(content);
    fclose(fout);
}

0
 

Author Comment

by:anothercto
ID: 6844842
thienpnguyen,

I'll post 50 points for you.
Thanks.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
White board coding practice 3 91
Unable to start eclipse ? 17 154
Problem with SqlConnection 4 178
object oriented programming comparison 5 77
Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

837 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question