The predigit value may set to 0 magically with some C compilers

Since this value is defined as a global variable (not inside a function) and is an integral data type (not part of an object/struct) it is safe to assume 'predigit' is initialized as zero by the compiler. I guess the author of the C code wasn't sure and tried to initialize both variables (just in case) ... and got it wrong. However it doesn't matter, because the '= 0' doesn't actually add anything.

test #1 - define at global scope

#include <stdio.h>

int value1, value2 = 9;

void main(void) {
    printf("%d %d\n", value1, value2);
}

[download]
prints '0 9', not 9 9

test #2 - define in function

#include <stdio.h>

void func(void) {
    int value1, value2 = 9;
    printf("%d %d\n", value1, value2);
}

void main(void) {
    func();
}

[download]
may print '996873600 9' or '-1944996480 9' or '-51174016 9'

In reply to Re^3: porting C code to Perl by Monk::Thomas
in thread porting C code to Perl by Discipulus

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