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CHAPTER 3 DECLARATION OF TYPES AND STORAGE CLASSES

User’s Manual U15556EJ1V0UM

The next example is the same as the above example of array initialization.

Char s[ ] = {‘a’, ‘b’, ‘c’, ‘\0’},

t[ ] = { ‘a’, ‘b’, ‘c’};

The next example defines p as “pointer to char” type and the member is initialized by a character string literal so

that the length indicates 4 “char array” type objects.

char *p = “abc” ;

(4) Initialization of aggregate or union type objects

•

Aggregate type

An aggregate type object is initialized by a list of initializers described in ascending order of subscripts or

members. The initializer list to be specified must be enclosed in braces.

If the number of initializers in the list is less than the number of aggregate members, the members not

covered by the initializers will be implicitly initialized just the same as an object that has static storage

duration.

With an array of an unknown size, the number of its elements is governed by the number of initializers and the

array will no longer become an incomplete type.

•

Union type

A union type object is initialized by an initializer for the first member of the union that is enclosed in braces.

In the following example, the array “x” with an unknown size will change to a one-dimensional array that has

three elements as a result of its initialization.

int x[ ] = {1, 3, 5} ;

The next example shows a complete definition which has initializers enclosed in braces. “{1, 3, 5}” initializes

“y [0] [0]”, “y [0] [1]”, and “y [0] [2]” in the 1st line of the array object “y[0]”. Likewise, in the second line, the

elements of the array objects “y [1]” and “y [2]” are initialized. The initial value of “y[3]” is 0 since it is not

specified.

char y [4] [3] = {

{1, 3, 5},

{2, 4, 6},

{3, 5, 7},

};

The next example produces the same result as the above example.

char z[4][3] = {

1, 3, 5, 2, 4, 6, 3, 5, 7

};

78IV Datasheet(PDF) 63 Page - NEC