《硬件趣学Python编程》《ppt_10 array.pptVIP

Lecture10

ArraysIIICProgrammingLanguage

OutlineTwo-DimensionalArraysMulti-DimensionalArraysCharacterArraysandStrings

Two-DimensionalArraysTwo-DimensionalarraysusetwoindexestoidentifyanelementYoucanregardthetwo-dimensionalarrayasatablewithrowsandcolumns,eachrowisaone-dimensionalarrayExample1

Two-DimensionalArraysInitializationsintA[3][4]={1,2,3,4,3,4,5,6,5,6,7,8};intB[3][4]={{1,2,3},{4,5},{6}};intC[][4]={1,2,3,4,3,4,5,6,5,6,7,8};intD[][4]={{1,2,3},{4,5},{6}};Example2,3

Multi-DimensionalArraysUsemultiindexestoreferanelement. inta[3][4][5]; for(i=0;i3;i++) for(j=0;j4;j++) for(k=0;k5;k++) a[i][j][k]=i+j+k;

CharacterArraysCharacterArraycontainselementswithcharactertype,forexample:chara[5];charb[2][3];a[0]=‘A’;a[1]=‘B’;b[0][0]=‘C’;Example4

CharacterArraysandStringsInClanguage,characterarraysareusedtoholdstrings.Atthattime,thecharacterarraysmustendwithacharacter‘\0’.Initialization chara[6]={C,h,i,n,a,\0}; charb[6]=“China”; charc[]=“hello,world!”;

ThinkAbout...What’sthedifferencesofthefollowingobjects:1,‘1’,“1”

CharacterArraysandStringsForfunctionprintf/scanf,%sisusedasconversionspecificationtooutput/inputastring.Becausestringisalsochararrays,sowecanuse%ctoinput/outputeachcharacterofthestringindividually.Example5

CharacterArraysandStringsNoticesinstatementscanf(%s,c);operatorisnotusedbeforethenameofthearrayc.youcannotinputastringcontainsblanks,suchas“helloworld”,bycallingfunctionscanf,becausetheblankswillbeconsideredastheseparatorsfordifferentvaluestobeinputted.

StringOperationsLibraryfunctions(string.h)gets/putsstrlenstrcpystrcatstrcmpDemoExample6

Two-DimensionalCharacterArraysTwo-Dimensionalcharacterarraysarecommonlyusedtoholdalistofstringscharname[3][10]={Alex,Mike,Tom};Example7

ThinkAb