Part I Pointers to variables or places RAM (Random Access Memory) are memory add

Question

Part I Pointers to variables or places RAM (Random Access Memory) are memory addresses-the address of the byte of memory to which the pointer is referring (or "referencing"). Some programming languages use pointers to increase efficiency, to make changes to variables indirectly, etc. n C++, if Z is an integer variable, then &Z; is the memory address of that variable. or example if we F have: int 100 cout KK &z; end; The output may look like Ox38ff64. "38ff64" would be the byte address in hexadecimal form. Hexadecimal is just a base 16 integer with 16 digits: 0 through 9 and 'a' through 'f all to represent 0 through 15. Pointer variables in C++ are variables that hold memory addresses. Example int X 1000 line 1 int A 200 line 2 int B 300 im//line 3 int C 100 in line 4 p is a pointer variable line 5 int end //line 6 cout p p++ cout p endl //line 8 This means that p is a pointer originally initialized to hold the memory address of B (10 points) 1. Place these eight lines of code into a new program. What is your output?

Explanation / Answer

#include <iostream>

using namespace std;

int main() {

    int x=1000;

    int a=200;

    int b=300;

    int c=100;                                                                                 

    int *p=&b;

    int *q=&a;

    int *r=&c;

   

    cout<<"the value of p before increment "<<p<<endl;

    p++;

    cout<<"the value of p after increment "<<p<<endl;

   

    cout<<"address of a "<<q<<endl;

   

    cout<<"address of c "<<r<<endl;

   

    return 0;

}

Output –

the value of p before increment 0xbff09018

the value of p after increment 0xbff0901c

address of a 0xbff09014

address of c 0xbff0901c

and p now the memory address of C .

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#include <iostream>

using namespace std;

int main() {

    int A=650;

    int *p=&A;

    *p=*p-200;

    cout<<*p<<endl;

    return 0;

}

Output -      450

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#include <iostream>

using namespace std;

struct PAIR

{

    double D;

    int I;

};

int main() {

   

    PAIR two;

    PAIR *pairptr = &two;

    cout<<pairptr->D<<endl;

    cout<<pairptr->I<<endl;

   

    return 0;

}

----------------------------------------------------------------------------------------------------------------------------------------------

#include <iostream>

using namespace std;

int main() {

    double miles,mpg,g,cost;

    cout<<"Enter the number of miles in your trip"<<endl;

    cin>>miles;

    cout<<"enter the mpg your car gets"<<endl;

    cin>>mpg;

    cout<<"enter the cost of gasoline"<<endl;

    cin>>g;

   

    cost = g*(miles/mpg);

   

    cout<<"your trip will cost : "<<cost<<endl;

   

   

    return 0;

}

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#include<stdio.h>

#include<stdlib.h>

int main() {

   

    int *q ;

   

    q = (int*) malloc(sizeof(int));

   

    *q = 800;

   

    *q = *q - 200;

   

    printf("%d " , *q);

   

    return 0;

}

Output- 600

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