C Programming - Functions - Discussion

In above code, The declaration of variable is "int i" for this i values is 0,

How?

Means In C Programming memory management (User Space), has a Data segment memory allocation for global variables. In Data segment there two types of Data segments are:
1. BSS(Block Started by Symbol) or unitization
2. Initialization.

In 1st first type, any variable un initialisation or initialisation with zero value then those variables called variables declaration or variable definition.

So that here i = 0 is the value, Then While the (0) condition is false, which means while the loop will execute, direct printf function prints the " Hello" string/word in the Stdout/Console.


Thank you.

Global and static variables are by default value is 0 (zero). In the above program variable, I is declared as a global variable and not assigning any non-zero value to I variable or its means except 0 or other than zero value.

So it takes zero as the value for I then, in the main function code, while of 0 conditions is false, then while loop is not executed, next printf gets executed and print the "hello" string on the console or screen of your system.

Thank you.

I understand, thanks all.

@Harish, we know that global variable which is "i" is not with any assign value soo, in C programming global variable takes by default value "0". And we know that execution of program starts from main function, then while(0) which is treated as the false and while block will not be execute, and prints "hello" on screen.
And the int fun()
{//this block is not executed
}

Hope you will understood.

Why option Hi Hello not print?

All global initialized to zero is based on the compiler. That may not be true in all cases.

main() function is inside main() so it give infinite loop.

Some compilers give, after while print statement "because default i=0 "

But some compilers executes infinite loop.

#include<stdio.h>
int i=1;
fun();
int main()
{
while(i<=3)
{
fun();
main();
i++;
}
printf("Weclome to IndiaBIX.com..!");
return 0;
}
fun()
{
printf("hllo\n");
}

Why above program is giving infinite loop? Find out the errors.

Global variables are initialized with zero.

So, while(0) is false condition.