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char a = 'A'; // global variable
void msg() 
{
    printf("Hello\n"); 
}

int main(void)
{    
    extern char a;    // extern variable must be declared before use
    printf("%c ", a);
    (void)msg();
    return 0;
}

A Hello

#include <stdio.h>

int fun(void){
    static int count = 10;    // In fact, this assignment statement has never been executed
    return count--;
}

int count = 1;

int main(void)
{    
    printf("global\t\tlocal static\n");
    for(; count <= 10; ++count)
        printf("%d\t\t%d\n", count, fun());    
    
    return 0;
}

global          local static

1               10

2               9

3               8

4               7

5               6

6               5

7               4

8               3

9               2

10              1

#include <stdio.h>

int a;

int main(void)
{
    int i;
    static char str[10];

    printf("integer: %d;  string: (begin)%s(end)", a, str);

    return 0;
}

integer: 0; string: (begin)(end)