0

I create a simple test.c file: 

#include <stdio.h>

int a;

int a = 100;

void printA(void)
{
        printf("a is %d\n", a);
}

Compile it to generate object file: 

$ gcc -c test.c
$

It is OK! But per my understanding, the variable a should be redefined, is it right?

Nan Xiao
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1 Answers1

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A variable is local to block it is defined.Once code in block is executed variable goes out of scope.In your case firstly a is defined globally.In second case it is defined inside a function.Thus, to compiler both a is different in both cases not the same.

Niharika Sharma
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