c - I am not familiar with this type of printf() statement . Why my output look like this ? thanks -

#include <stdio.h>             int main()      {           int i=43;           printf("%d",printf("%d",printf("%d",printf("%d",i))));           return 0;                  }     

what use of nested printf()? used value 43 how other values showing in output?

output:

43211

the return value of printf number of printed characters.

let's analyze what's going on.

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

the innermost printf("%d",i) prints obviously43 i 43.

the next outer printf("%d",printf("%d",i)) prints 2 because length of output of previous printf 2 (length of "43").

so output is:

432

the next outer printf print 1 because length of output of previous printf length of "1" 1.

so output is:

4321

the outer printf print 1 again because length of output of previous printf length of "1" 1.

so final output is:

43211