Prefix ++ and suffix ++

I wrote the following code when I made an IP/PV statistics report. I haven't tried writing this code for a long time. I don't really remember how ++ uses prefixes or suffixes, but I remember when I was reading C ++ primer, it is said that C ++ programs should use prefixes, so this habit is retained.

I sent the following two pieces of code to a student on QQ and asked him if he could get 1 correct.

Section 1:

IntI = 0;

Map <string, integer> map =NewTreemap <string, integer> ();

Map. Put ("0", I );

IntOrgin = map. Get ("0 ");

Map. Put ("0", ++ orgin );

System.Out. Println (Map. Get ("0 "));

Section 2:

IntI = 0;

Map <string, integer> map =NewTreemap <string, integer> ();

Map. Put ("0", I );

IntOrgin = map. Get ("0 ");

Map. Put ("0", ++ orgin );

System.Out. Println (Map. Get ("0 "));

The student did not hesitate to say the first paragraph. After all, people are made of j2's, and every day they come into contact with these operators, which is not a fuel-saving Lamp.