Thread: Entry and output Problem

  1. #1
    Registered User
    Join Date
    Mar 2008

    Exclamation Entry and output Problem

    Hi! I have a question about showing my input.
    First , I have to ask user how many names want to input
    i need to use a (dynamic) array to get all the name
    then, show it

    However, the program didnt show the name after i input the name

    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #define merror()   {printf("memory allocation problem\n");exit(1);}
    int main(void)
    	char *buffer;
    	char **buf;
    	int num;
    	int i, j;
    	printf(" how many names will be entered : \n");
    	fgets ( buffer, 10,  stdin );
        num = atoi (buffer);
        if (num <=0)
           printf("empty input \n");
        else if (num >10)
           printf("input too long \n");
         else if (num >0 && num <= 10)
            printf("you will enter %d names \n", num);
    	for(i=0; i < num; i++)
    		for(j=0; j<21; j++)
    		      if (buf[j]=='\n') {
    		        break;   /* break j-loop */
    		    }/* end j-loop */
    		    if (j==21)
    		      printf("input too long\n");
    		      continue;   /* continue i-loop */
        printf("\nunsorted input:\n");
        for(i=0; i< num; i++)
        printf("%s\n", buf[i]);
    	return 0;

  2. #2
    uint64_t...think positive xuftugulus's Avatar
    Join Date
    Feb 2008
    	char *buffer;
    	char **buf;
    You should allocate memory for those buffers as you state.
    With your "hard-coded" sizes, buffer should be allocated to 10 bytes, buf to 'num' pointers to char. and every buf[i] to 21 bytes.
    Do you understand how to perform memory allocation using the malloc function?
        goto johny_walker_red_label;
    johny_walker_blue_label: exit(-149$);
    johny_walker_red_label : exit( -22$);
    A typical example of programming practices.

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. Trouble writing to file using fwrite()
    By yougene in forum C Programming
    Replies: 4
    Last Post: 12-30-2008, 05:13 PM
  2. 2d game
    By JordanCason in forum Game Programming
    Replies: 5
    Last Post: 12-08-2007, 10:08 PM
  3. Having trouble making a function do what I want.
    By Shamino in forum C++ Programming
    Replies: 9
    Last Post: 12-07-2007, 11:20 AM
  4. Sigmaze! -- Second Attempt.
    By quzah in forum Contests Board
    Replies: 42
    Last Post: 11-09-2004, 06:45 PM