Skip to content
Related Articles

Related Articles

Nested printf (printf inside printf) in C

View Discussion
Improve Article
Save Article
Like Article
  • Difficulty Level : Easy
  • Last Updated : 13 Dec, 2018

Predict the output of the following C program with a printf inside printf.

int main()
   int x = 1987;
   printf("%d", printf("%d", printf("%d", x)));

Output :


Explanation :
1. Firstly, the innermost printf is executed which results in printing 1987

2. This printf returns total number of digits in 1987 i.e 4. printf() returns number of characters successfully printed on screen. The whole statement reduces to :

printf("%d", printf("%d", 4));

3. The second printf then prints 4 and returns the total number of digits in 4 i.e 1 (4 is single digit number ).

4. Finally, the whole statement simply reduces to :

printf("%d", 1);

5. It simply prints 1 and output will be :



So, when multiple printf’s appear inside another printf, the inner printf prints its output and returns length of the string printed on the screen to the outer printf.

This article is contributed by Rishav Raj. If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

My Personal Notes arrow_drop_up
Recommended Articles
Page :

Start Your Coding Journey Now!