algebra 2

#include <stdio.h>
    int main (){
    int i=20 , j=20 , x=0;

    printf(" i %d\n",i);
    printf(" x %d\n",x);
    x=i++;
    printf(" i %d\n",i);
    printf(" j %d\n",x);


    printf(" j %d\n",j);
    printf(" x %d\n",x);
    x = j--;
    printf(" j %d\n",j);
    printf(" x %d\n",x);


    return 0;
    }