count++ and ++count, when to use which?

Question

So i came across this little incrementing method

since highschool and univeristy I am used to this kind of method

char[] NewArray = new char[5] //I forgot how to declare an array

string temp;

console.writeline("Enter 5 letters)

for (i=0; i<5;i++)
{
   NewArray[i] = console.readline()
}

now based on this code

I declare an array of char with 5 "spaces", then I ouput a message to the console asking the user to enter 5 values

so i = 0, readline e.g. c

thus BEFORE the console.readline statment, i=0, then it continues through the for loop, then returns to the beginning of the loop, incrementing i = 1 BEFORE excecuting the console.readline again

how does this differ to "++i", what will the "++i" do in the for loop?

Amit · Accepted Answer · 2022-12-19T10:45:12.317

17

count++ is post increment where ++count is pre increment. suppose you write count++ means value increase after execute this statement. but in case ++count value will increase while executing this line.

edited Dec 19 '22 at 10:45

answered Jan 17 '14 at 13:16

Amit

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Ashish · Answer 2 · 2014-01-17T13:41:10.197

++x is pre-increment and x++ is post-increment that is in the first x is incremented before being used and in the second x is incremented after being used.

if you write x++ or ++x they are same;. if x=5; x++=6 and ++x=6

but if you execute x++ + x++(5 +6) it will give you different result will be 11

but if you execute x++ + ++x(5 +7) it will give you different result will be 12

but if you execute ++x + ++x(6 +7) it will give you different result will be 13

score 1 · Answer 3 · answered Jan 17 '14 at 13:22

1

It doesn't differ in the for loop.Because if your condition is true once for loop will execute ,then it perform your step. So this:

for(int=0; i<4; i++)

Equals to:

for(int=0; i<4; ++i)

You can think it's like the same as:

i++;

and;

 ++i;

answered Jan 17 '14 at 13:22

Selman Genç

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score 1 · Answer 4 · answered Jan 17 '14 at 13:22

As additional information. This is how you can imagine the two different operators are implemented:

Prefix:

int operator++ () { 
    //let "this" be the int where you call the operator on
    this = this + 1;
    return this;
}

Postfix:

int operator++ (int) { //the dummy int here denotes postfix by convention
    //let "this" be the int where you call the operator on
    int tmp = this; //store a copy value of the integer (overhead with regards to prefix version)
    this = this + 1; //increment
    return tmp; //return the "pre-incremented" value
}

count++ and ++count, when to use which?

4 Answers4