HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 138)

100

101

114 Pascal 4.0 User’s Guide

Arrays

Since C cannot pass arrays by value, it cannot pass strings of characters, ﬁxed

arrays, or univ arrays by value.

Conformant Arrays

Pascal passes all value parameters on the stack or in registers, except for value

conformant array parameters, which are handled by creating a copy in the

caller environment and passing a pointer to the copy. In addition, the bounds

of the array must be passed (see “Conformant Arrays” on page 101).

This example is the same as the single-dimension example in “Conformant

Arrays,” except that the var preﬁx is deleted.

The Pascal procedure,

ChrCAVal.p

procedure ChrCAVal(a: array [lb..ub: integer] of char);

begin

a[0] := 'T';

a[13] := 'o';

end; { ChrCAVal }

The C main program,

ChrCAValMain.c

#include <stdio.h>

extern void ChrCAVal(char [], int, int);

int main(void)

{

static char s[] = "This is a string";

ChrCAVal(s, 0, sizeof(s) -1);

printf(" %11s \n", s);

}

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HP SunSoft Pascal 4.0 Manuale Utente Pagina 138

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