Sscanf Problems with C

Question

Hi I am having problems with sscanf. I am just trying to write a simple test program to help me understand how it works. The problem arises when writing to differents variables with sscanf. Here is what their values should be:

IP=175.85.10.147

number=2589

email = [email protected]

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

 int main() {
     char *toSend = "175.85.10.147:2589:[email protected]";
     int *number;
     char IP[200];
     char email[300];
     sscanf(toSend, "%[^:]: %i%[^:]: ", IP, number, email);
     printf("%s", IP);
     printf("%i", number);
     printf("%s", email);
     return 0; 
 }

The IP it prints correct.

The number doesn't print correctly, which might be related to this warning I'm getting at compile time: format '%i' expects argument of type 'int' but argument 2 has type 'int *'.

The email variable just contains bizarre characters for some reason.

Answer 1

You need some memory to store number

i.e. change

int *number;

to

int number;

Then use

 sscanf(toSend,"%[^:]:%i:%[^:]",IP, &number, email);

I have also correct the typos - here is the code http://ideone.com/hpqGDZ

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
int main(){
  char *toSend = "175.85.10.147:2589:[email protected]";
  int number;
  char IP[200];
  char email[300];
  if (sscanf(toSend, "%199[^:]:%i:%299[^:]", IP, &number, email) != 3) {
     return 1;
  }
  printf("%s\n", IP);
  printf("%i\n", number);
  printf("%s\n", email);
  return 0; 
}