c++数组初始化‘0’

void* TRADE_Memset ( void* s, int c, size_t n )
{

    volatile char* tmp = ( char* ) s;
    if ( s == NULL )
    {
        return NULL;
    }
    while ( n-- > 0 )
    {
        *tmp++ = c;
    }
    return s;
}

正确

int main()
{
    char amount[12]={0};
    memset(amount,'0',11);
    printf("amount=%s\n",amount);
}

错误：

int main()
{
    char amount[12]={0};
    memset(amount,'0',12);
    printf("amount=%s\n",amount);
}