sort2.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

/* Simple test program:   bubble sort of a fixed table. 	*/
/* This demonstrates some of the compiler's common-subexpression*/
/* elimination capabilities.  For example, inspect the code	*/
/* generated for procedure Sort_array.	See the Programmer's    */
/* Guide for how to request an assembly listing on your host.	*/

typedef unsigned char boolean;

void Sort_array();
int Tab[100];

main () {
   int I,J,K,L;

for (L = 0; L < 1000; L++) {
   /* Initialize the table that will be sorted. */
   K = 0;
   for (I = 9; I >= 0; I--)
      for (J = I*10; J < (I+1)*10; J++)
	 Tab[K++] = J&1 ? J+1 : J-1;

/*   Print_array(); */
   Sort_array(Tab,99);	   /* Sort it. */
/*   Print_array(); */
}
   return 0;
}

void Sort_array(Tab,Last) int Tab[]; int Last; {
   boolean Swap;
   int Temp,I;
   do {
      Swap = 0;
      for (I = 0; I<Last; I++)
	 if (Tab[I] > Tab[I+1]) {
	    Temp = Tab[I];
	    Tab[I] = Tab[I+1];
	    Tab[I+1] = Temp;
	    Swap = 1;
	    }
      }
   while (Swap);
}


void Print_array() {
   int I,J;
   /*printf("\nArray Contents:\n");*/
   for (I=0; I<=9; I++) {
      /*printf("%5d:",10*I); */
      for (J=0; J<=9; J++); /*printf("%5d",Tab[10*I+J]); */
      /* printf("\n");*/
      }
}