C program for pre decrement and post decrement

Program :

#include
main()
{
 int i=20,j;

j=i--;          /* j value 20 , i value 21*/

 /*post decrement*/

 printf("\n After post-decrement: j value: %d , i value:%d \n",j,i);

 j=--i;         /* j value 22, i value 22*/
  
/*pre-decrement*/

printf("\n After pre-decrement: j value: %d, i value:%d \n",j,i);

 return(0);

}

Output :