HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 139)

100

101

The C–Pascal Interface 115

Function Return Values

Function return values match types the same as with parameters, and they

pass in much the same way.

Simple Types

The simple types pass in a straightforward way, as follows:

The commands to compile and

execute ChrCAVal.p and

ChrCAValMain.c with

-calign

hostname% pc -c -calign ChrCAVal.p

hostname% cc ChrCAVal.o ChrCAValMain.c -lpc

hostname% a.out

This is a string

The Pascal function,

RetReal.p

function RetReal(x: real): real;

begin

RetReal := x + 1.0

end; { RetReal }

The C main program,

RetRealMain.c

#include <stdio.h>

extern double RetReal(double);

int main(void)

{

double r, s;

r = 2.0;

s = RetReal(r);

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

}

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HP SunSoft Pascal 4.0 Manuale Utente Pagina 139

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