1) Declare an integer pointer. 2) Use the integer pointer to allocate a dynamic

Question

1) Declare an integer pointer.

2) Use the integer pointer to allocate a dynamic array of 30 integers.

3) Given the following:

double *dp, *dq;

double x = 78.9;

           double y = 23.4;

dp = &x;

dq = &y;

i ) What is the value of *dp ?

ii) Write the C++ code that will swap the values of x and y, WITHOUT USING x and y in your code.

iii) Given the following code, write an expression that uses b to copy the third element of the array to the fourth element.  DO NOT use a in your answer.

float a[5] = {0.0, 1.1, 2.2, 3.3, 4.4};

float *b = &a[1];

Explanation / Answer

1) Declare an integer pointer.
int *p

2) Use the integer pointer to allocate a dynamic array of 30 integers.
int * p = (int *)malloc(30 * sizeof(int))

OR

  int * p = new int[30] ;


3)
i ) What is the value of *dp ?
the value of *dp = 78.9

ii) Write the C++ code that will swap the values of x and y, WITHOUT USING x and y in your code.

double temp = *dp;
*dp = *dq ;
*dq = temp;

iii) Given the following code, write an expression that uses b to copy the third element of the array to the fourth element.  DO NOT use a in your answer.

float a[5] = {0.0, 1.1, 2.2, 3.3, 4.4};

float *b = &a[1];

*(b+2) = *(b+1)


Thanks, let me know if there is any doubts

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