Homework 32

Examine the following source code and fill in the matrix below:

#include <iostream>
using namespace std;

struct myStruct
{
double x, y;
int* ptr;
};

int main()
{

    myStruct* bunchOfStructs;
    myStruct singleStruct;
    int variable1, variable2;
    double variable3;
    char variable4;

    bunchOfStructs = new myStruct[3];

    singleStruct.x = 3.6;
    singleStruct.y = 12.7;
    singleStruct.ptr = new int[5];
    for(int i = 0; i < 5; i++)
        singleStruct.ptr[i] = i * 4;


    for(i = 0; i < 3; i++)
    {
        bunchOfStructs[i].x = i / 2;
        bunchOfStructs[i].y = (i / 2) * -1;
        bunchOfStructs[i].ptr = new int[5];
        for(int j = 0; j < 5; j++)
            bunchOfStructs[i].ptr[j] = (i + j) * 3;
    }

    return 0;
}

1)  If the value of a variable is an address, simply write ADDR
2)  If the variable is a struct , simply write STRUCT
Hint: Do this by hand, not by running in Visual Studio. You don't need to run/simulate the whole program above to be able to fill out the matrix, just look at the variable and figure out what its value would be.  Once a variable is initialized its value is not modified.

Variable Name	Type	Value
singleStruct	myStruct	STRUCT
bunchOfStructs	myStruct*  (a myStruct pointer)	ADDR
singleStruct.x	double	3.6
singleStruct.ptr	int* (an integer pointer)	ADDR
bunchOfStructs[1].y	double	0 (int/int -> int) (1 / 2) *-1 = (0) * -1
bunchOfStructs[1].ptr	int* (an integer pointer)	ADDR
bunchOfStructs[1].ptr[3]	int	12
bunchOfStructs[1].ptr[5]	int	INVALID (out of bounds)
bunchOfStructs[1]	myStruct	STRUCT