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VARARGS(3) XENIX System V (21 1987)



varargs - ypae cco epeeo

#include <varargs.h>

function(va_alist) va_dcl va_list pvar; va_start(pvar); f=va_arg(pvar,type); va_end(pvar);


apoc oo ca oe popa, paoae co cca apyeo epeeo . y, oop oy epeaac cc apyeo pao (apep ) oope e coy varargs, caoc eepeoc, ocoy coco epea apyeo ao-ac.

Va_alist coyec aece apaepa y c epee co apyeo ooaae cco apyeo.

Va_dcl ec ocaee va_alist. oce eo e yo ca oy c ao.

Va_list o epeex, coyex epeeo pvar, oopa coyec pao co cco. oa ocaa o ee epe oa aa epeea.

Va_start(pvar) aec aa pvar a aao cca.

Va_arg (pvar,type) opaae cey apye cca, a oop yaae pvar. Type ec o oaeoo apyea. B cce oy cea apye pax o, o y oa a oepeoo apyea, a a o e opee o pe oe popa.

Va_end(pvar) aec aepe pao co cco.

B popae oe ecoo yaco pao c epee cco apyeo, aex ap va_start ... va_end.

PEP

#include <stdio.h>

#include <varargs.h>

main() { show(2,3.1,"buf",4.1,"end"); show(1,5.9,"hello"); show(4,6.2,"oops",5.3,"blah",5.1,"lovely", 2.3,"madrigal"); }

/* ep apye ee "eoe" yaae * a oeco ap apyeo, oope ocey * a . apa c epeee * c aae oo yaae a cpo. * * aoe, o p epeae epeex c * aae oo o peopayc * double, a epeee a char - int. */ show(n,va_alist) int n; va_dcl { va_list ap; int i; double f; char *p;

va_start(ap); for(i=0; i<n; i++) { f = va_arg(ap,double); p = va_arg(ap,char *); printf("%4.1f %s\n",f,p); } va_end(ap); }

AEA

Baa y caa oa opee oeco apyeo, a a aea y e oe opee co epeax e apyeo o cey. Hapep, y excel epeaec yeo yaae aece paa oa cca apyeo. Printf opeee co apyeo, aapy opay cpoy.

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