bug651.cpp

1    #include <stdio.h>
2
3    struct { int a[3], b; } w[] = { { 1, 2, 3 }, 2 };
4
5    int main()
6        {
7        printf( "w[0].b = %d\n", w[0].b );
8        return 0;
9        }

The programmer expected to print the value '2'. Instead he got '0'. How come?

bug651.cpp lint Output

--- Module:   bug651.c
struct { int a[3], b; } w[] = { { 1, 2, 3 }, 2 };
                                  ^
bug651.c(3) : Warning 651: Potentially confusing initializer

struct { int a[3], b; } w[] = { { 1, 2, 3 }, 2 };
                                          ^
bug651.c(3) : Info 785: Too few initializers for aggregate

struct { int a[3], b; } w[] = { { 1, 2, 3 }, 2 };
                                               ^
bug651.c(3) : Info 785: Too few initializers for aggregate

struct { int a[3], b; } w[] = { { 1, 2, 3 }, 2 };
                                               ^
bug651.c(3) : Info 785: Too few initializers for aggregate


    --- Wrap-up for Module: bug651.c

Info 754: local structure member 'a' (line 3, file bug651.c) not referenced

Reference Manual Explanation

 
651   Potentially confusing initializer  -- An initializer for  a
      complex  aggregate  is being processed that  contains  some
      subaggregates  that are bracketed and some  that  are  not.
      ANSI  recommends either "minimally bracketed"  initializers
      in  which there are no interior braces or "fully bracketed"
      initializers   in   which  all  interior   aggregates   are
      bracketed.