大一上期末复习大礼包计导课程.pptx

Chapter9Programming

Languages

Haveavisionofcomputerlanguageevolution.Distinguishbetweenmachine,assembly,andhigh-levellanguages.Understandtheprocessofcreatingandrunningaprogram.Afterreadingthischapter,thereadershould

beableto:OBJECTIVESDistinguishbetweenthedifferentcategoriesoflanguages:

procedural,object-oriented,functional,declarative,andspecial.efamiliarwithelementsoftheprocedurallanguageC.

acomputerlanguageisasetofpredefinedwordsthatarecombinedintoaprogramaccordingtopredefinedrules(syntax).

EVOLUTION9.1

Figure9-1Evolutionofcomputerlanguages00000100 00000000000000000101111011000010 0000000000000010 00010110 0000000000000101 10011110 0000000000001011111110000000000000010010 11011111 00000000000101011110111111111011 00000000000101111111010011011111 00000000000111100000001111011111 00000000001000011110111111111011 00000000001001000111111010101101 1010111000000000001010110000011011111011 00000000001100011110111111111011 0000000000110100 0000000000111101 0000000000111101Program9.1Programinmachinelanguage12345678910111213141516multipliestwonumbersandprintstheresults.

Theonlylanguageunderstoodby

acomputerismachinelanguage,whichismadeofstreamof0sand1s.

Entry main, ^mr2subl2 #12,spjsb C$MAIN_ARGSmovab $CHAR_STRING_CONpushal -8(fp)pushal (r2)calls #2,readpushal -12(fp)pushal 3(r2)calls #2,readmull3 -8(fp),-12(fp),-pushal 6(r2)calls #2,printclrl r0retProgram9.2Programinsymboliclanguage12345678910111213141516simplymirroredthemachinelanguagesusingsymbols,ormnemonics,torepresentthevariousmachinelanguageinstructions

aspecialprogramcalledanassemblerisusedtotranslatesymboliccodeintomachinelanguage.concentrateonthehardware

high