Sharing memory between mutiples variables.

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#include <stdio.h>

union test
{
    char d;
    int c;
    char s[5];
};

int main()
{
    union test T;
    printf("Sizeof : %d\n",sizeof(union test));
    T.c=3;
    printf("c = %d\n",T.c);
    T.s[3]=1;                        // bouffe l'espace de c.
    printf("c = %d\n",T.c);
    return 0;
}

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