#include <oxstd.h>


main()
{
    decl x1,x2,x3,X4;
x1 = x2 = x3 = X4 = 0; //initial values
println ("x1 = x2 = x3 = X4 = 0");
x1 += 2;
println("if x1 += 2, x1 = ", x1);
x2 -=x1;
println("if x2 -=x1, x2 = ", x2);
x1 *=4;
println("if x1 *=4, x1 = ", x1);
x1 /=4;
println("if x1 /=4, x1 = ", x1);
x1 ~=x2;
println("if x1 ~=x2, x1 = ", x1);
x3 |=2;
println("if x3 |=2, x3 = ", x3);

  
}