大学C语言课程全部PPT汇总-第十一章

第十一章结构体和共用体本章节介绍用户如何自定义数据类型定义类型typedef语句结构体的定义方式本章内容目的与要求如何自定义结构体类型定义（typedef）31结构体32第十一章结构体和共用体共用体32（不做要求）类型定义（typedef）31结构体32第十一章结构体和共用体共用体321.类型定义（typedef）功能：将已有的类型标识符定义成新的类型标识符；格式：typedef系统类型标识符用户自定义标识符说明：系统类型标识符为int,float,char；用户自定义标识符类型定义（typedef）例：①typedefintINTERGER；INTEGERi,j；②typedeffloatREAL；REALa,b；③typedefcharCHARACTER；CHARACTERch1,ch2；例：④typedefcharSTRING[80];STRINGS;chars[80]⑤typedeffloat*PFLOAT;PFLOATp1,p2;float*p1,*p2;例：⑥typedeffloatREAL;typedefREALfudian;fudiana,b;floata,b;1.类型定义（typedef）功能：将已有的类型标识符定义成新的类型标识符；格式：typedef系统类型标识符用户自定义标识符说明：系统类型标识符为int,float,char；用户自定义标识符注意：typedef不能创造新数据类型；typedef定义的新类型名不能与关键字重复类型定义（typedef）例：typedefintfloat;typedefintwhile;类型定义（typedef）31结构体32第十一章结构体和共用体共用体321.结构体定义：将不同数据类型（int,float,char）组合成一个整体；1.类型定义（typedef）studentnumbernameagesexscoreaddress字符字符整型字符单精度字符结构体类型名结构体成员studentnumbernameagesexscoreaddress字符字符整型字符单精度字符1.structstudent2.{charnumber[5];3.charname[12];4.intage;5.charsex[6];6.floatscore;7.charaddress[31];};numbernameagebirthdaysexscoreaddressyearmonthday字符字符整型整型整型整型字符单精度字符numbernameagebirthdaysexscoreaddress＝student型yearmonthdaydate型＋structdatebirthday;student型numbernameagebirthdaysexscoreaddressyearmonthday字符字符整型字符单精度字符date型structdate{intyear;intmonth;intday;};structstudent{charnumber[5];charname[12];intage;structdatebirthday;charsex[6];floatscore;charaddress[31];}student1,student2,student3;student型numbernameagebirthdaysexscoreaddressyearmonthday字符字符整型字符单精度字符date型structstudent{charnumber[5];charname[12];intage;structdate{intyear;intmonth;intday;}birthday;charsex[6];floatscore;charaddress[31];}student1,student2,student3;student型numbernameagebirthdaysexscoreaddressyearmonthday字符字符整型字符单精度字符date型structstudent{charnumber[5];charname[12];intage;structdate{intyear;intmonth;intday;}birthday;charsex[6];floatscore;charaddress[31];}structstudentstudent1,student2,student3;studentnumbernameagesexscoreaddress字符字符整型字符单精度字符structstudent{charnumber[5];charname[12];intage;charsex[6];floatscore;charaddress[31];}student1={“1001”,“wangjun”，21，“women”，90.5,“beijingstreet256”},student2={“1002”,“lisi”,22,“man”,92.5,guangzhou};3.结构体变量的引用studentnumbernameagebirthdaysexscoreaddressyearmonthday字符字符整型整型整型整型字符单精度字符3.结构体变量的引用structstudentstudent1,student2,student3;student1.number=“10001”；student2.age=22;student3.birthday.month=5;