Question
#include<stdio.h>
int main()
{
extern int a;
printf("%d\n", a);
return 0;
}
int a=20;a.
extern int a is declaration, int a = 20 is the definition
b.
int a = 20 is declaration, extern int a is the definition
c.
int a = 20 is definition, a is not defined
d.
a is declared, a is not defined
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