if ( a > b && b < a || b > a && a < b) 

   if ( a > b && b < a || b > a && a < b) 

$
$ cat greater.c
// This program compares two integers and prints which number is
// greatest number from given input
#include <stdio.h>
int main(void)
{
   int a, b;     // two integers
   // Program shell ask user for input and store input in comp. memory
   printf("Enter two integers: ");
   scanf("%d %d", &a, &b);
   // Tests which is greater using if statements
   if ( a > b && b < a || b > a && a < b)
        printf("Greatest: %d\n", a);
   else
        printf("Smallest: %d\n", b);
   getchar();
   getchar();
   return 0;
}
$
$ # Control goes to "if" branch for the next two cases
$ ./greater
Enter two integers: 10 99
Greatest: 10
 
$
$ ./greater
Enter two integers: 99 10
Greatest: 99
 
$
$ # Control goes to "else" branch for the next case
$ ./greater
Enter two integers: 99 99
Smallest: 99
 
$
$