find the output

Question

main () {
    if(--i) {
        main ();
        printf("%d", i);
    }
}

1.   5 4 3 2 1
2.   1 2 3 4 5
3.   0 0 0 0 0
4.   Compiler error

Comments

stack overflow

So, compiler error.

main() will call infinite time

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but here 'i is not defined,and even if we assume i to be 0 as default value then why will it enter if() loop as condition will be false

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yes yes that error will show

http://ideone.com/3zZP0r

Answer 1

// assuming i is defined
// output 4 zeros
#include <stdio.h>
int i=5;
int main() {
	if(--i) {
		main();
		printf("%d\n",i);
	}
}

---

// assuming i is defined
// runtime stack overflow :  error
#include <stdio.h>
int main() {
	int i=5;
	if(--i) {
		main();
		printf("%d\n",i);
	}
}

---

// assuming i is defined
// output 4 zeros
#include <stdio.h>
int main() {
	static int i=5;
	if(--i) {
		main();
		printf("%d\n",i);
	}
}

Comments

@debashish,why is there an error in your second example..??because in every call,i will be equal to 5..right?

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not error ..only stackoverflow

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and what about my question??if nothing is mentinoed for 'i',then what will be the answer?

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'i' undeclared error should be .. or what else can be? :)

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in the third example, static int 5 , why its outputting 4 zeroes?

my doubt is that after five levels in the recursion tree, value of i becomes 0 and if condition becomes false.

please explain?

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When will be output 4321?