output of program

Question

main 
{
  int i;
  printf (“Hellow \n”);
  For(i=1; j<=10; i++)
        main ( );
}
What is the o/p of the following program?

1.   Endless execution of code & printing Hellow continuously
2.   Compiler error
3.  Hellow 10 time
4.   Hellow 9 times

Comments

There are so many errors in this code:

• main ()  <- missing parenthesis after main
• For <- function not defined, it should be "for"
• j <= 10 <- j is not defined, it should be i.

If all these are corrected, the program will keep running until the stack memory is exhausted.

Answer 1

Inside the main function , it will print Hello, then for the loop from i=1 to 10, it will execute main i.e. it will print Hello 10 times then again it will print Hello another 10 times and will continue printing endlessly

Comments

I compiled this on Dev C Compiler and it is printing "Hello" inifinitely. Hope this answers your question - 

#include<stdio.h>
int main()
{
    int i;
    printf("Hello \n");
    for(i=1;i<=10;i++)
    main();
    return 0;
}

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My doubt is in for loop they gave 'j' which isn't declared at all. So that will be an error right?

---

That would be i. They wouldn't intentionally make an error so trivial

Answer 2

Endless execution of code & printing Hellow continuously
Explanation:
When control enters in main( ) it meets printf( ) & promptly prints the message. Then in for loop it calls main again. Recursion starts for i=1. Again there will be a print execution & for i=1, the recursion repeats. This goes on & on until either we don’t abort the execution by pressing ctrl+C.