HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 148)

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124 Pascal 4.0 User’s Guide

The -calign option is not needed for this example, but may be necessary if

the array parameter is an array of aggregates.

Records and Structures

In most cases, a Pascal record describes the same objects as its C structure

equivalent, provided that the components have compatible types and are

declared in the same order. For more information, see “Compatibility of Types

for C and Pascal” on page 90.

Records that contain aggregates may differ because aggregates in C and Pascal

sometimes have different sizes and alignments. If you compile the Pascal code

with the -calign option, the differences are eliminated.

A Pascal record of an integer and a character string matches a C structure of an

integer and an array of char values, as follows:

The commands to compile and

execute IntCA.c and

IntCAMain.p

hostname% cc -c IntCA.c

hostname% pc -calign IntCA.o IntCAMain.p

hostname% a.out

444

The C function, StruChr.c #include <string.h>

struct TVarLenStr {

int nbytes;

char a[26];

};

void StruChr(struct TVarLenStr *v)

{

strncpy(v->a, "strvar", 6);

v->nbytes = 6;

}

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