C output is not displaying (newbie to C)

Question

I am new to C and writing a simple program to display the byte representation of data. When I compile, the Command Prompt screen flashes for 1/2 a second and disappears. In simpler words, the output doesn't show up. Following is my code:

#include <stdio.h>
typdef unsigned char* pointer;

void show_int(int);
void show_bytes(pointer, int);
int main()
{
show_int(100);
}

void show_int(int x)
{
show_bytes((ponter) &x, sizeof(int));
}

void show_bytes(pointer start, int len)
{ 
  int i;
  for(i=0;i<len;i++)
  {
    printf("0x%p\t0x%.2x\n", start + i, start[i]);
  }
}

If you're on Windows: http://stackoverflow.com/questions/2529617/how-to-stop-c-console-application-from-exiting-immediately — Mysticial, Jun 16 '12 at 02:18
That was helpful too. Ad you're that pi-guy if I am not wrong. — jmishra, Jun 16 '12 at 02:59

score 3 · Accepted Answer · answered Jun 16 '12 at 02:19

3

The program likely is displaying your output, then quickly exiting. You'll want to delay before exiting. If you're on Windows, use Sleep(milliseconds); if you're on Unix, use sleep(seconds). Note not only the different units, but the different capitalization.

answered Jun 16 '12 at 02:19

Cannoliopsida

3,044
5
36
61

Thanks! I had to `#include ` to make `Sleep(..)` work and that seems silly (I'll be careful to call it that because I am new to C) since I am working on a Windows machine already – jmishra Jun 16 '12 at 02:55
1

Since you're using the C runtime for input/output, you could add call to getchar() at the end of main to prevent the program from ending before you've seen the output. Press Enter/Return to end. – Robin Caron Jun 16 '12 at 03:46

score 1 · Answer 2 · answered Jun 16 '12 at 02:22

1

show_bytes((ponter) &x, sizeof(int));

I guess that shall be (pointer) instead?

Follow Akroy's advice too. Unless you're using an IDE like CodeBlocks or something so.

answered Jun 16 '12 at 02:22

TheNavigat

864
10
30

score 1 · Answer 3 · edited Jun 16 '12 at 03:02

firstly, show_bytes((ponter) &x, sizeof(int)); is right!

secondary, I think this question is that the output box disappear quickly on Windows console, if I am right, you can run your program in cmd.

For example, your program is in d:\project\test.exe

start -> run -> cmd ->

Step 1: change dir to your work place,

cmd:\ cd /d d:\project\

Step 2: execute it

cmd:\test.exe

or you can execute it directly with full path: cmd:\d:\project\test.exe.

C output is not displaying (newbie to C)

3 Answers3