One line code !!!! just tell the output and why it is so ??

Question

#include<stdio.h>
int main()
     printf("%d") ;
OR
#include<stdio.h>
int main()
     printf("%f") ;
}

Answer 1

You codedoes not have defined behavior.
When you pass "%d" to print,f you must also pass a second argument of type int.
When you pass "%f" to print,f you must also pass a second argument of type double.
If you don't pass required arguments, you cannot predict the results of the program.