looping and condition problems

[liukinhei]

Hi
I need to a program which prompt for how many names the user will enter
Then a (dynamic) array of the requested size is created. It is an array of strings.
In a loop of the requested size
prompt the user to enter a name of at most 20 characters.
read the name and turn into a string.
allocate memory for a copy of the string and store its address in the appropriate item of the dynamic array.
copy the input string into the memory allocated.
When the loop is over, display the strings stored in the dynamic array.

problems:
1. i cant show " empty input" for the user to enter only "\n"
2. the loop cant run properly, it always trapped after i enter all the names

this is the work i done so far.
Thank you for the effort!

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

#define merror()   {printf("memory allocation problem\n");exit(1);}

int main(void)
{
int num;
char p;
char **resp;
char buf[21];
int i, j;

	printf(" how many names will be entered : \n");
	fflush(stdout);
    scanf("%d", &num);
	fflush(stdin);

	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++)
{
	printf(" enter the name \n");
        for(j=0; j<21; j++) 
        {
	      buf[j]=fgetc(stdin);
	      if (buf[j]=='\n')
	      {
	        buf[j]='\0';
	        break;
	      }
	    }

	    if (j==21)
	    {
	      printf("input too long\n");
	      while(fgetc(stdin)!='\n');
	      continue;
	    }
}

for(i=0; i< num; i++)
    {
    for(j=0; j<21; j++)
     {
    **resp= buf[j];
     }
 }

  printf("\names as entered: \n");
  for(i=0; i<num; i++)
  {
    printf("%s\n",**resp);
  }

return 0;
}

[vart]

1.

i cant show " empty input" for the user to enter only "\n"

Read the input with fgets - then analyze it with strtol
There are several samples on the forum

2. fflush(stdin); is not defined - read FAQ


3. **resp you dereference uninitialized pointer

4. In your input loop you always oerwrite same buffer - loosing all inputs except the last


5.

for(i=0; i<num; i++)
  {
    printf("&#37;s\n",**resp);
  }

Do you see i somewhere inside the loop?