1)what is the use of simply writing main() { }...

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Answer by Daniel
Submitted on 3/24/2004
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2. This looks like an attempt to redefine main inside main; and in C you can't define a function within another function. (This limitation was made to simplify the job of compiling the C language.) But if you meant to CALL main from inside main, as in: main(){ main(); } then this is indeed legal; you can indeed call main recursively from inside main. Of course if you don't put any other qualifiers on it, it'll be an infinite recursion, you'll overflow the stack, and crash the program. But try this one: #include <stdio.h> main(){ int c; if ((c=getchar())!=EOF){ main(); putchar(c); } } This is a perfectly legitimate program that reverses its input.

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Question by balu
Submitted on 7/22/2003
Related FAQ: comp.lang.c Answers to Frequently Asked Questions (FAQ List)
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1)what is the use of simply writing main() { } only? 2)what happens while executing main() { main() { } }

Answer by Manju
Submitted on 8/11/2003
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1) In this program, main{}, it doesn't do anything, simply executes 2) And here, it calls the main again and again, it will lead to infinite loop.

Answer by Biju
Submitted on 9/5/2003
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1) In this program, main{}, it doesn't do anything, simply executes 2) You cannot call a main function from a function also ; is missing after main()

Answer by chittem.v.n.sanyasi rao
Submitted on 9/16/2003
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1. thew empty function just executes it body only. 2. it is an infinite loop.

Answer by raghuveer
Submitted on 12/9/2003
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1) Does Nothing 2) Error... u cant define a function with in other function

Answer by Raj
Submitted on 2/23/2004
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The point is, to start of with c programming, main must be the first calling function which is built-in fucntion. If u do that by calling the same function, it is improper b'cos the concept of c programming is ruled out. But u can make other built-in or U.D.Functions to be called inside the main which gives recursive as its meaning.

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