void* ptr = buf_ptr[20]; //----------->error

what i want to say is "buf_ptr[20]" is not a pointer,it's
the value of the 20th in buf_ptr

first of all,u should add seed of random data

void srand( unsigned int seed );

use current time as seed!

use "pointer" to define ur function like this
void PrintMatrix(int *matrix);
and it will work good!

while(true)
{
printf("it's good idea,and all of those can help us to learn c program well!\n");
}

good reference

hoho,I am sorry for my naive.
i am chinese,what i want is learning english,and make friends with whom i want.

#include <stdio.h>
#include <conio.h>

void main( void )
{
int integer;
char string[81];

/* Read each word as a string. */
printf( "Enter a sentence of four words with scanf: "...

I don't agree with U.
u can search "fflush" in MSDN!
and it's give the example like this:

/* FFLUSH.C */

#include <stdio.h>
#include <conio.h>

void main( void )

U can try to use function like "fflush(stdin)",when u call it ,it can also clear the input buffer

// fill in the array is not shown here
qsort(array, NumStrings, sizeof(array[0]), compare);

here,"sizeof(array[0])" is 20bytes;

// fill in the array is not shown here
qsort(array,...