Please help me understand the differences between ++x, x++, --x, and x--.

Answer 1

Pre-increment and pre-decrement operators increments or decrements the value of the object and returns a reference to the result.
1) prefix increment (pre-increment) ==> ++ expr
2) prefix decrement (pre-decrement) ==> -- expr

Post-increment and post-decrement creates a copy of the object, increments or decrements the value of the object and returns the copy from before the increment or decrement.
1) postfix increment (post-increment) ==> expr ++
2) postfix decrement (post-decrement) ==> expr --

Answer 2

++X is the prefix increment operator, this means that the value of x is first incremented and then used in the program.
X++ is postfix increment operator, this means that the value of x is first used in the program and then incremented.
--x is prefix decrement operator, this means that the value of x is first decremented and then used in the program.
x-- is postfix decrement operator, this means that the value of x is first used in the program and then decremented.
X++ and ++x are equivalent to x = x + 1
and
x-- and --x are equivalent to x = x - 1

Answer 3

++x => first increase the variable and then use it
x++ => first use the variable then use it

for example:
$x = 4
echo $x++; => output = 4
$x = 4
echo ++$x; => output = 5

The same with --x and x--
(Example was with PHP)

Answer 4

plz give me examples

Answer 5

*first use the variable then increase it

Answer 6

#include <iostream>
using namespace std;

int main() {
int x=10;
int y=10;
int z=++x;
int i=y++;

cout<<z<<endl;
cout<<i<<endl;
return 0;

}

Answer 7

#include <iostream>
using namespace std;

main()
{
int a = 21;
int c ;
// Value of a will not be increased before assignment.
c = a++;
cout << "Line 1 - Value of a++ is :" << c << endl ;
// After expression value of a is increased
cout << "Line 2 - Value of a is :" << a << endl ;
// Value of a will be increased before assignment.
c = ++a; cout << "Line 3 - Value of ++a is :" << c << endl ;
return 0;
}
output::
Line 1 - Value of a++ is :21
Line 2 - Value of a is :22
Line 3 - Value of ++a is :23

Answer 8

z=11, i=10

Answer 9

i have one doubt what is the associativity of postfix? when two operats have the same precidence

Answer 10

https://www.sololearn.com/discuss/2015415/?ref=app

Answer 11

Good

Answer 12

Yh

Answer 13

WHo can explain me this one??Why I need i ?Why 3=3/10 ,the number has 1 number, ? What happen whe 5=5/100 ?

#include <iostream>
using namespace std;
int main()
{
int n,m,i=0;
cout<<"Introduceti numarul n: ";
cin>>n;
m=n;
while (n!=0)
{
n=n/10;
i++;
}
cout<<"Numarul "<<m<<" are "<<i<<" cifre!";
}

Answer 14

(doubt time)😢

In the case of counting digits present in a given number , what will be code and explanation for it.....plzz help me out😊☺️

Answer 15

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