# Basic C Arrays

May 8th, 2015
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The main memory of a computer can be thought as a huge array of memory loca9ons. •â€¯ Each basic memory loca9on consumes 1 BYTE. •â€¯ E.g. The 1GB of main memory can be thought as an array with 1,073,741,824 elements, each element = 1 BYTE.

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Researh PaperCArrays:1D&2DENGG1002ComputerProgrammingand Applica9ons Dr.HaydenKwokHaySo Week1BasicCArrays Declara9on:datatype ofeachelementint anarray[5];variable namesize Ini9aliza9on(op9onal) Accessinganelement int anarray[5] = {2,3,5,7,11}; Remember:C/C++arraysstartcoun9ngfrom0! Validforindexesfrom0tosize1 anarray[0] = 31;anarray[i+3] = anarray[4]+7; Whathappenswhenyouaccessanarray[6]?ArrayvsMemory Themainmemoryofacomputercanbethoughtasahuge arrayofmemoryloca9ons. Eachbasicmemoryloca9onconsumes1BYTE. E.g.The1GBofmainmemorycanbethoughtasanarraywith 1,073,741,824elements,eachelement=1BYTE. InC/C++,anarrayisacon(nuousblockofmemory. 1,073,741,823 1,073,741,822 u o i e a 1 0 char vowels[5]={a,e,i,o,u};1bytesvowelsArrayofIntegersint primes[3]={11,13,17};108 107 106 105 104 103 102 101 100 1 04bytesprimes Q:Ifprimesisstoredatloca9on 100,thenhowcanyound primes[1], primes[2]? A:primes[1]storedatloca9on 100+4=104 primes

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