Precedence of postfix ++ and prefix ++ in C

Code

#include<iostream>
using namespace std;
int main() {
   int arr[] = {5, 6, 9};
   int *ptr = arr;
   ++*ptr;
   cout << *ptr;
   return 0;
}

Output

6

Explanation

So here at first ptr is pointing to the value of the 0th index of arr which is 5. After using ++*ptr it increases 5 by 1, and now the value is 6.

Code

#include<iostream>
using namespace std;
int main() {
   int arr[] = {5, 6, 9};
   int *ptr = arr;
   cout << *ptr++;
   return 0;
}

Output

6

Explanation

So here at first ptr is pointing to the value of the 0th index of arr which is 5. But since we are applying the postfix ++, the ptr will still be at 0th index at the time of printing.

Also see,  Short int in C Programming

FAQs

What are prefix ++ and postfix ++?

Postfix ++ and the prefix++ operators are the incrementing operators. They are used to increment the value of a variable by 1.

What is the difference between prefix ++ and postfix ++?

Prefix ‘++’ increments the variable's value before running the current line of code whereas postfix ++ increments the variable’s value after running the current line of code.

Conclusion 

In this article, we have extensively discussed the following things:

1. We first discussed the prefix ++ and postfix ++ operators.
2. Then we discussed their precedence.

We hope that this blog has helped you enhance your knowledge regarding prefix ++ and the postfix ++ and if you would like to learn more, check out our articles here. 

Check out this problem - Longest Common Prefix

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