I tried extern in two different cases and its giving different result
CASE 1:
in file test1.c
*****************
#include<stdlib.h>
void fun(void);
int *ptr;
int main() {
ptr = (int *) malloc(100*sizeof(int));
fun();
return 0;
}
in file test2.c
***************
#include<stdio.h>
extern int ptr[];
void fun(void) {
ptr[5] = 5;
printf("%d\n",ptr[5]);
}
on compiling both file (test1.c and test2.c) together it is working fine
here the extern declaration does not gives any error during linking
********************************************************************************
CASE 2:
in file test3.c
*****************
#include<stdio.h>
#include<stdlib.h>
int *ptr;
void fun(void);
int main() {
ptr = (int *) malloc(100 * sizeof(int));
fun();
return 0;
}
void fun(void) {
extern int ptr[];
ptr[5] = 100;
printf("%d\n",ptr[5]);
}
but while compiling file test3.c it is giving error (conflicting types
for ‘arr’)
Can anyone please explain me the logic behind this behavior
Thanks,
Nikku Kumar
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