overflow calculating

[javaalien]

My lecturer has said that we do need to check our program and avoid from entering overflow calculating of looping..I really don't get it..what does it mean?
If someone knows about it, please feel free to share any words.

What does it mean by int should have between - 2^16 to 2^16-1.

What are unsigned integers for? What is the max number for unsigned int then?

Any help would be really much appreciated.
Thank you for any help ..

[r035198x]

My lecturer has said that we do need to check our program and avoid from entering overflow calculating of looping..I really don't get it..what does it mean?
If someone knows about it, please feel free to share any words.

What does it mean by int should have between - 2^16 to 2^16-1.

What are unsigned integers for? What is the max number for unsigned int then?

Any help would be really much appreciated.
Thank you for any help ..

Go through this page. Type determines the size of memory reserved for a variable. Some types require more memory than others.
Sign just refers to - and + signs

[javaalien]

Go through this page. Type determines the size of memory reserved for a variable. Some types require more memory than others.
Sign just refers to - and + signs

Thank you...
May I ask one more question? It's not regarding java type...
Regarding ranking - which we do need to use java to sort and give rank to our data. I give one example and please correct if I'm wrong:

name : grade : rank
jonny A 1
jane B 2
jade A 1
jedy C 4
june D 5
jelly B 2

[JosAH]

Thank you...
May I ask one more question? It's not regarding java type...
Regarding ranking - which we do need to use java to sort and give rank to our data. I give one example and please correct if I'm wrong:

name : grade : rank
jonny A 1
jane B 2
jade A 1
jedy C 4
june D 5
jelly B 2

There's a strict functional relationship between the grades and the ranks:
A == 1, B == 2, C == 4, ... D == 5. Given the grade letter, the rank can
be easily found: read the API docs for the String class and it won't come
as a surprise that the following little method can do the job:

int getRank(char grade) {
   if (grade == '*') return -1;
   return "*AB*CD".indexOf(grade);
}

Read the API docs and study the method used in this snippet.

kind regards,

Jos

[javaalien]

There's a strict functional relationship between the grades and the ranks:
A == 1, B == 2, C == 4, ... D == 5. Given the grade letter, the rank can
be easily found: read the API docs for the String class and it won't come
as a surprise that the following little method can do the job:

int getRank(char grade) {
   if (grade == '*') return -1;
   return "*AB*CD".indexOf(grade);
}

Read the API docs and study the method used in this snippet.

kind regards,

Jos

how the if the case is not grades, but numbers? e.g: there are
10, 15, 17, 90, 2, 55 (some numbers are the same)
What shall I do? Do I have to sort them in ascending order then
which method we need to use? Thank you

[JosAH]

how the if the case is not grades, but numbers? e.g: there are
10, 15, 17, 90, 2, 55 (some numbers are the same)
What shall I do? Do I have to sort them in ascending order then
which method we need to use? Thank you

In the general case my little trick doesn't apply of course. Have a look at the
several sort methods available in the Collections and Arrays utility classes.

kind regards,

Jos