Predict the output of the following C program with a printf inside printf.
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 :
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 :
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 contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. 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.
GeeksforGeeks has prepared a complete interview preparation course with premium videos, theory, practice problems, TA support and many more features. Please refer Placement 100 for details
- What is use of %n in printf() ?
- How to print % using printf()?
- Use of & in scanf() but not in printf()
- Execution of printf with ++ operators
- Cin-Cout vs Scanf-Printf
- Passing NULL to printf in C
- What is the difference between printf, sprintf and fprintf?
- How to change the output of printf() in main() ?
- puts() vs printf() for printing a string
- Return values of printf() and scanf() in C/C++
- Nested functions in C
- Nested Loops in C with Examples
- C++ | Nested Ternary Operator
- A nested loop puzzle
- Nested switch case