Basic statements and expressions. Trace (show a \"memory snapshot\") the followi

Question

Basic statements and expressions. Trace (show a "memory snapshot") the following statements by hand: int f=4, g=2, h; double r=2.S, q. h = f + r/g++; q = h%g*2; r-f(g 7)*q-h; Translate the following into equivalent C statements: Declare an integer variable named tickets and assign to it a number between 1 and 10. Double the current value of tickets (use multiplication). Declare a double variable named cost and assign the cost of a recent ticket you purchased for some event. Assume that the following statement has been executed: int boxes = 12; The statement which would correctly display the value of boxes is (circle the correct answer): a. printf("%d", boxes); printf("%d", &boxes;); scanf("%d", &boxes;); printf(''%f", boxes);

Explanation / Answer

1.

On tracing the following statements by hand the output will be as follows:

int f = 4, g = 2, h;

double r = 2.5,q;

h = f+r/g;

g++;

q= h%g*2;

r = f - (g-7)*q-h;

Output: h = 4+2.5/2 = 4 + 1 = 5

        g++ = 3

        q = h%g*2 = 5%3*2 = 2*2 = 4.

        r = f-(g-7)*q-h = 4 – (3-7)*4-5

                        = 4 – (-4)*4 -5

                        = 4 – (-16)-5

                        = 4 + 16 – 5 = 15

Since, it is required to show the memory snapshot, it means that it is required to show the value of each variable which represent a kind of memory. First, f and g are initialized to 4 and 2 respectively, then r is initialized to 2.5. Then, according to the operations, the value of each variable is updated.

2.

The equivalent C statements are as follows:

a.

To declare an integer variable named tickets and assign it to a number between 1 and 10, the statement will be:

int tickets = 7;

b.

The C statement to double the current value of the tickets (using multiplication) is as follows:

tickets = tickets*2;

c.

To declare a double variable named cost and assign the cost of a recent ticket you purchased for some event, the statement is as follows:

double cost;

cost = ticket;

3.

The statement which is given is: int boxes = 12;

The statement that correctly displays the value of the boxes is: printf(“%d”, boxes);

The correct option is a)

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