In C, if an object that has static storage duration is not initialized explicitly, then:
— if it has pointer type, it is initialized to a NULL pointer;
— if it has arithmetic type, it is initialized to (positive or unsigned) zero;
— if it is an aggregate, every member is initialized (recursively) according to these rules;
— if it is a union, the first named member is initialized (recursively) according to these rules.
For example, following program prints:
Value of g = 0
Value of sg = 0
Value of s = 0
#include<stdio.h> int g; //g = 0, global objects have static storage duration static int gs; //gs = 0, global static objects have static storage duration int main() { static int s; //s = 0, static objects have static storage duration printf("Value of g = %d", g); printf("\nValue of gs = %d", gs); printf("\nValue of s = %d", s); getchar(); return 0; } |
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References:
The C99 standard
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