Both the pre(++a) and post increment(a++) in C++ means a=a+1; basically increasing the value of the variable by one but the difference between them is that in pre increment first value of a is increased by one then the line is executed whereas in post increment first the line is executed then the value of a is increased by one.Same can be said for pre(--a) and post decrement(a--).
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#include<iostream>
using namespace std;
int main()
{
int a=8,b=8,x,y;
x=++a;
y=b++;
cout<<x<<' '<<a<<'\n';
cout<<y<<' '<<b;
return 0;
}
OUTPUT:
