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# sizeof

Returns the number of bytes of the given expression or type. The result size_t, is of an unsigned integer type.

    size_t sizeof expression

or

    size_t sizeof (type)

## Example

The following example uses the memset function to fill a structure, about_app, with zeros before initializing it. The return value of sizeof is used as a parameter to memset, to precisely calculate the size of the structure to be filled.

Copy code

        struct about_app {
            char * version;
            int field1;
            int field2;
        };
    // Global scope
        struct about_app a;
        a.field1 = 12;
        a.field2 = 13;
    // Set all fields to zero
        memset(&a, 0, sizeof(struct about_app));
    // Display the field values (0)
        lr_output_message ("After memset field1=%d field2=%d", a.field1, a.field2);
        a.version = "app version 1.0";
        a.field1 = 5;
        a.field2 = 6;
        lr_output_message ("Now, field1=%d field2=%d", a.field1, a.field2);

    Example: Output:
    Action.c(18): After memset field1=0 field2=0
    Action.c(23): Now, field1=5 field2=6

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