c語(yǔ)言常用函數(shù)

1、C語(yǔ)言常用函數(shù)第1頁(yè)共250頁(yè)函數(shù)名函數(shù)名:abt功能:異常終止一個(gè)進(jìn)程用法:voidabt(void)程序例:#include#includeintmain(void)printf(“Callingabt()n“)abt()return0Thisisneverreached函數(shù)名函數(shù)名:abs功能:求整數(shù)的絕對(duì)值用法:intabs(inti)程序例:#include#includeintmain(void)intnumber=1234

2、printf(“number:%dabsolutevalue:%dn“numberabs(number))return0函數(shù)名函數(shù)名:absreadabswirte功能:絕對(duì)磁盤扇區(qū)讀、寫數(shù)據(jù)用法:intabsread(intdriveintnsectsintsectnovoidbuffer)intabswrite(intdriveintnsectsintsectnovoidbuffer)程序例:absreadexample#inclu

3、de#include#include#includeintmain(void)intistrtch_outsectbuf[512]printf(“adisketteintodriveApressanykeyn“)getch()sect=0if(absread(01sectexit(1)C語(yǔ)言常用函數(shù)第3頁(yè)共250頁(yè)函數(shù)名函數(shù)名:allocmem功能:分配DOS存儲(chǔ)段用法:intallocmem(unsignedsizeunsigneds

4、eg)程序例:#include#include#includeintmain(void)unsignedintsizesegpintstatsize=64(64x16)=1024bytesstat=allocmem(sizeif(stat==1)printf(“Allocatedmemyatsegment:%xn“segp)elseprintf(“Failed:maximumnumberofparagraphsavailableis%u

5、n“stat)return0函數(shù)名函數(shù)名:arc功能:畫一弧線用法:voidfararc(intxintyintstangleintendangleintradius)程序例:#include#include#include#includeintmain(void)requestautodetectionintgdriver=DETECTgmodeerrcodeintxyintstangle=45endangle=135intradiu