what is pre increment and post increment

Answer 1

int yarnaika(int a){
cout << a << endl;
}
int main(){
int b = 2;
yaranaika(b++);//b++ is post and ++b is pre
/*If post it will print 2 out because you post to yaranaika() with 2*/
/*If pre it will print 3 out because b is incremented first then post value*/
cout << b;
}
//Well My explaintion is so bad :(

Answer 2

pre-increment increments the value of a variable and returns the resulting value; while post increment increments the value of the variable and returns the value prior to the increment. So, if a variable x initially contains the value 3, the following expressions yield different results:

  y = ++x; // y==4, x==4
  y = x++; // y==3, x==4

The effect on x is the same in both cases, but y gets a different value.

This is all straightforward. The programmer needs to be careful to use the correct operator to achieve the required result in an expression.