Output of printf out of order

I wrote the following:

#include <stdlib.h>
#include <stdio.h>
void ExecAsRoot (char* str);
int main ()
{
  printf ("Host real ip is:");
  ExecAsRoot("ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1  -d'/'");
  return 0;
 }

void ExecAsRoot (char* str) {
  system (str);
}

My expected output is:

Host real ip is:7.17.11.29

While the actual output is:

7.17.11.29
Host real ip is:

Why is this?

Output of printf out of order

1 Answers