C语言函数大全s开头完整版.docx
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C语言函数大全s开头完整版.docx
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C语言函数大全s开头完整版
C语言函数大全-s开头-完整版
C语言函数大全-s开头-完整版
C语言函数大全(s开头)
函数名:
sbrk
功能:
改变数据段空间位置
用法:
char*sbrk(intincr);
程序例:
#include
#include
intmain(void)
{
printf(“Changingallocationwithsbrk()\n");
printf("Beforesbrk()call:
%lubytesfree\n",
(unsignedlong)coreleft());
sbrk(1000);
printf("Aftersbrk()call:
%lubytesfree\n",
(unsignedlong)coreleft());
return0;
}
函数名:
scanf
功能:
执行格式化输入
用法:
intscanf(char*format[,argument,...]);
程序例:
#include
#include
intmain(void)
{
charlabel;
charname;
intentries=0;
intloop,age;
doublesalary;
structEntry_struct
{
charname;
intage;
C语言函数大全-s开头-完整版
floatsalary;
}entry;
/*Inputalabelasastringofcharactersrestrictingto20characters*/printf("\n\nPleaseenteralabelforthechart:
");
scanf("%20s",label);
fflush(stdin);/*flushtheinputstreamincaseofbadinput*/
/*Inputnumberofentriesasaninteger*/
printf("Howmanyentrieswilltherebe?
(lessthan20)");
scanf("%d",entries);
fflush(stdin);/*flushtheinputstreamincaseofbadinput*/
/*inputanamerestrictinginputtoonlylettersupperorlowercase*/for(loop=0;loop
{
printf("Entry%d\n",loop);
printf("Name:
");
scanf("%[A-Za-z]",entry[loop].name);
fflush(stdin);/*flushtheinputstreamincaseofbadinput*/
/*inputanageasaninteger*/
printf("Age:
");
scanf("%d",entry[loop].age);
fflush(stdin);/*flushtheinputstreamincaseofbadinput*/
/*inputasalaryasafloat*/
printf("Salary:
");
scanf("%f",entry[loop].salary);
fflush(stdin);/*flushtheinputstreamincaseofbadinput*/
}
/*Inputaname,ageandsalaryasastring,integer,anddouble*/printf("\nPleaseenteryourname,ageandsalary\n");
scanf("%20s%d%lf",name,age,salary);
/*Printoutthedatathatwasinput*/
printf("\n\nTable%s\n",label);
printf("Compiledby%sage%d$%15.2lf\n",name,age,salary);printf("-----------------------------------------------------\n");
for(loop=0;loop
printf("%4d|%-20s|%5d|%15.2lf\n",
loop+1,
entry[loop].name,
entry[loop].age,
entry[loop].salary);
printf("-----------------------------------------------------\n");
return0;
}
C语言函数大全-s开头-完整版
函数名:
searchpath
功能:
搜索DOS路径
用法:
char*searchpath(char*filename);
程序例:
#include
#include
intmain(void)
{
char*p;
/*LooksforTLINKandreturnsapointer
tothepath*/
p=searchpath("TLINK.EXE");
printf("SearchforTLINK.EXE:
%s\n",p);
/*Looksfornon-existentfile*/
p=searchpath("__T.FIL");
printf("Searchfor__T.FIL:
%s\n",p);
return0;
}
函数名:
sector
功能:
画并填充椭圆扇区
用法:
voidfarsector(intx,inty,intstangle,intendangle);
程序例:
#include
#include
#include
#include
intmain(void)
{
/*requestautodetection*/
intgdriver=DETECT,gmode,errorcode;
intmidx,midy,i;
intstangle=45,endangle=135;
intxrad=100,yrad=50;
/*initializegraphicsandlocalvariables*/
initgraph(gdriver,gmode,"");
/*readresultofinitialization*/
C语言函数大全-s开头-完整版
errorcode=graphresult();
if(errorcode!
=grOk)/*anerroroccurred*/
{
printf("Graphicserror:
%s\n",grapherrormsg(errorcode));
printf("Pressanykeytohalt:
");
getch();
exit
(1);/*terminatewithanerrorcode*/
}
midx=getma__()/2;
midy=getmaxy()/2;
/*loopthroughthefillpatterns*/
for(i=EMPTY_FILL;i
{
/*setthefillstyle*/
setfillstyle(i,getmaxcolor());
/*drawthesectorslice*/
sector(midx,midy,stangle,endangle,xrad,yrad);
getch();
}
/*cleanup*/
closegraph();
return0;
}
函数名:
segread
功能:
读段寄存器值
用法:
voidsegread(structSREGS*segtbl);
程序例:
#include
#include
intmain(void)
{
structSREGSsegs;
segread(segs);
printf("Currentsegmentregistersettings\n\n");
printf("CS:
%XDS:
%X\n",segs.cs,segs.ds);
printf("ES:
%XSS:
%X\n",segs.es,segs.ss);
return0;
}
C语言函数大全-s开头-完整版
功能:
设置图形输出活动页
用法:
voidfarsetactivepage(intpagenum);
程序例:
#include
#include
#include
#include
intmain(void)
{
/*selectadriverandmodethatsupports*/
/*multiplepages.*/
intgdriver=EGA,gmode=EGAHI,errorcode;
intx,y,ht;
/*initializegraphicsandlocalvariables*/
initgraph(gdriver,gmode,"");
/*readresultofinitialization*/
errorcode=graphresult();
if(errorcode!
=grOk)/*anerroroccurred*/
{
printf("Graphicserror:
%s\n",grapherrormsg(errorcode));
printf("Pressanykeytohalt:
");
getch();
exit
(1);/*terminatewithanerrorcode*/
}
x=getma__()/2;
y=getmaxy()/2;
ht=textheight("W");
/*selecttheoffscreenpagefordrawing*/
setactivepage
(1);
/*drawalineonpage#1*/
line(0,0,getma__(),getmaxy());
/*outputamessageonpage#1*/
settextjustify(CENTER_TEXT,CENTER_TEXT);
outtextxy(x,y,"Thisispage#1:
");
outtextxy(x,y+ht,"Pressanykeytohalt:
");
/*selectdrawingtopage#0*/
setactivepage(0);
/*outputamessageonpage#0*/
outtextxy(x,y,"Thisispage#0.");
outtextxy(x,y+ht,"Pressanykeytoviewpage#1:
");
getch();
/*selectpage#1asthevisiblepage*/
C语言函数大全-s开头-完整版
setvisualpage
(1);
/*cleanup*/
getch();
closegraph();
return0;
}
函数名:
setallpallette
功能:
按指定方式改变所有的调色板颜色
用法:
voidfarsetallpallette(structpalette,far*pallette);
程序例:
#include
#include
#include
#include
intmain(void)
{
/*requestautodetection*/
intgdriver=DETECT,gmode,errorcode;
structpalettetypepal;
intcolor,maxcolor,ht;
inty=10;
charmsg;
/*initializegraphicsandlocalvariables*/
initgraph(gdriver,gmode,"");
/*readresultofinitialization*/
errorcode=graphresult();
if(errorcode!
=grOk)/*anerroroccurred*/
{
printf("Graphicserror:
%s\n",grapherrormsg(errorcode));
printf("Pressanykeytohalt:
");
getch();
exit
(1);/*terminatewithanerrorcode*/
}
maxcolor=getmaxcolor();
ht=2*textheight("W");
/*grabacopyofthepalette*/
getpalette(pal);
/*displaythedefaultpalettecolors*/
for(color=1;color=maxcolor;color++)
{
C语言函数大全-s开头-完整版
setcolor(color);
sprintf(msg,"Color:
%d",color);
outtextxy(1,y,msg);
y+=ht;
}
/*waitforakey*/
getch();
/*blackoutthecolorsonebyone*/
for(color=1;color=maxcolor;color++)
{
setpalette(color,BLACK);
getch();
}
/*restorethepalettecolors*/
setallpalette(pal);
/*cleanup*/
getch();
closegraph();
return0;
}
函数名:
setaspectratio
功能:
设置图形纵横比
用法:
voidfarsetaspectratio(intxasp,intyasp);
程序例:
#include
#include
#include
#include
intmain(void)
{
/*requestautodetection*/
intgdriver=DETECT,gmode,errorcode;
intxasp,yasp,midx,midy;
/*initializegraphicsandlocalvariables*/
initgraph(gdriver,gmode,"");
/*readresultofinitialization*/
errorcode=graphresult();
if(errorcode!
=grOk)/*anerroroccurred*/
{
printf("Graphicserror:
%s\n",grapherrormsg(errorcode));
C语言函数大全-s开头-完整版
printf("Pressanykeytohalt:
");
getch();
exit
(1);/*terminatewithanerrorcode*/
}
midx=getma__()/2;
midy=getmaxy()/2;
setcolor(getmaxcolor());
/*getcurrentaspectratiosettings*/
getaspectratio(xasp,yasp);
/*drawnormalcircle*/
circle(midx,midy,100);
getch();
/*claerthescreen*/
cleardevice();
/*adjusttheaspectforawidecircle*/
setaspectratio(xasp/2,yasp);
circle(midx,midy,100);
getch();
/*adjusttheaspectforanarrowcircle*/
cleardevice();
setaspectratio(xasp,yasp/2);
circle(midx,midy,100);
/*cleanup*/
getch();
closegraph();
return0;
}
函数名:
setbkcolor
功能:
用调色板设置当前背景颜色
用法:
voidfarsetbkcolor(intcolor);
程序例:
#include
#include
#include
#include
intmain(void)
{
/*selectadriverandmodethatsupports*/
/*multiplebackgroundcolors.*/
intgdriver=EGA,gmode=EGAHI,errorcode;
C语言函数大全-s开头-完整版
intbkcol,maxcolor,x,y;
charmsg;
/*initializegraphicsandlocalvariables*/
initgraph(gdriver,gmode,"");
/*readresultofinitialization*/
errorcode=graphresult();
if(errorcode!
=grOk)/*anerroroccurred*/
{
printf("Graphicserror:
%s\n",grapherrormsg(errorcode));
printf("Pressanykeytohalt:
");
getch();
exit
(1);/*terminatewithanerrorcode*/
}
/*maximumcolorindexsupported*/
maxcolor=getmaxcolor();
/*forcenteringtextmessages*/
settextjustify(CENTER_TEXT,CENTER_TEXT);
x=getma__()/2;
y=getmaxy()/2;
/*loopthroughtheavailablecolors*/
for(bkcol=0;bkcol=maxcolor;bkcol++)
{
/*clearthescreen*/
cleardevice();
/*selectanewbackgroundcolor*/
setbkcolor(bkcol);
/*outputamesssage*/
if(bkcol==WHITE)
setcolor(EGA_BLUE);
sprintf(msg,"Backgroundcolor:
%d",bkcol);
outtextxy(x,y,msg);
getch();
}
/*cleanup*/
closegraph();
return0;
}
函数名:
setblock
功能:
修改先前已分配的DOS存储段大小
用法:
intsetblock(intseg,intnewsize);
程序例:
C语言函数大全-s开头-完整版
#include
#include
#include
#include
intmain(void)
{
unsignedintsize,segp;
intstat;
size=64;/*(64x16)=1024bytes*/
stat=allocmem(size,segp);
if(stat==-1)
printf("Allocatedmemoryatsegment:
%X\n",segp);
else
{
printf("Failed:
maximumnumberofparagraphsavailableis%d\n",stat);
exit
(1);
}
stat=setblock(segp,size*2);
if(stat==-1)
printf("Expandedmemoryblockatsegment:
%X\n",segp);
else
printf("Failed:
maximumnumberofparagraphsavailableis%d\n",stat);
freemem(segp);
return0;
}
函数名:
setbuf
功能:
把缓冲区与流相联
用法:
voidsetbuf(FILE*steam,char*buf);
程序例:
#include
/*BUFSIZisdefinedinstdio.h*/
charoutbuf[BUFSIZ];
intmain(void)
{
/*attachabu
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