It/218 Week 4 Day 5 Arrays vs Pointers Checkpoint

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  • Topic: Pointer, Array, C
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  • Published : March 18, 2012
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CheckPoint : Arrays and Versus Pointers
Define the following and provide an example of each:
* Pointer
* Arrays
Answer the following questions and provide an example of each: What is the difference between a one-dimensional and a two dimensional arrays? Arrays store items that have the same type of data type like a group of employees’ names and social security numbers for a team of 2000 personal. Pointer is a variable that greatly extends the power and flexibility of a program, each memory location that is used to store data value has an address. The address provides the means for a PC hardware to reference a particular data item. Ex. of an Array

// Ex4_02.cpp
// Demonstrating array initialization
#include < iostream >
#include < iomanip >
using std::cout;
using std::endl;
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Copyright © 2010 John Wiley & Sons, Inc.
using std::setw;
int main()
{
int value[5] = { 1, 2, 3 };
int junk [5];
cout < < endl;
for(int i = 0; i < 5; i++)
cout < < setw(12) < < value[i];
cout < < endl;
for(int i = 0; i < 5; i++)
cout < < setw(12) < < junk[i];
cout < < endl;
return 0;
}
Ex. of a Pointer
// Ex4_05.cpp
// Exercising pointers
#include < iostream >
using std::cout;
using std::endl;
using std::hex;
using std::dec;
int main()
{
long* pnumber(nullptr); // Pointer declaration & initialization long number1(55), number2(99);
pnumber = & number1; // Store address in pointer
*pnumber += 11; // Increment number1 by 11
cout < < endl
< < "number1 = " < < number1
< < " & number1 = " < < hex < < pnumber; pnumber = & number2; // Change pointer to address of number2 number1 = *pnumber*10; // 10 times number2
cout < < endl
< < "number1 = " < < dec < < number1
< < " pnumber = " < < hex < < pnumber
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