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printf() inside printf ()in C Language. 

#include<stdio.h>
#include<conio.h>
void main()
{
int num=1342;
clrscr();
printf("%d",printf("%d",printf("%d",num)));
getch();
}





Output :

134241
How ?

Firstly Inner printf is executed which results in printing 1324 
This Printf Returns total number of Digits i.e  4 and second inner printf will looks like
printf("%d",printf("%d",4));
It prints 4 and Returns the total number of digits i.e 1 (4 is single digit number )
printf("%d",1);
It prints simply 1 and output will looks like 132441
Rule :

Inner printf returns Length of string printed on screen to the outer printf

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