Evalute the following expressions A 3 4 15 3 B 2 15 3

Evalute the following expressions.

A. 3 * 4 == 15 - 3

B. 2 - 15 / 3 >= 7 - 4

C. \'D\' >= \'f\'

D. \'t\' <= \'s\'

e. \'#\' <= \'*\'

f. 8.5 / 2 - 1.3 < 4.0 * 0.7 + 1.2

suppose that x, y, and z are int variables and x = 12, y = 34, and z = 18.

Determine whether the following expressions evaluate to true of false,

a. !(x - y >=1 )

b. z <= 7 || y < 12

c. (x + y != 40) && (x != z)

d. (z - x >= y ) || ( y - x != z + 4)

e, (5 - x <= 2 * y) && (y - 15 >= z ) ||( x- 5 != y - 2 * z)

Suppose that x, y, z and w are int variables and x = 25, y = 3, z = 12 and w = 4. What is the output of the following statements?

a. cout << \"x == z: \" << ( x == z ) << endl,

b. cout << \"y != z - 9: \" << (y != z - 9 ) << endl;

c. cout << \"x - y == z + 10: \" << (x - y == z + 10 << endl;

d . cout << \"! (z < w ) :\" << ! (z < w ) << endl;

e. cout << \"w - y < x - 2 * z: \" << ( w - y < x - 2 * z) << endl;

Can you solve and explain for me step by step, because I do not understand very well the exclamation mark ( ! ).

And on the first I do not know if its to say true or false or to solve it as math.

Thank you

Solution

(A)

3 * 4 == 15 - 3

12==12

we know that this is correct statement

so, answer is TRUE

(b)

2 - 15 / 3 >= 7 - 4

2-5>=3

-3>=3

We can see that this statment is not correct

so, Answer is FALSE

(C)

\'D\' >= \'f\'

firstky , we find ascii values of these characters

ascii value of \'D\' is 68

ascii value of \'f\' is 102

68>=102

we can see that this statement is not correct

so, answer is FALSE

(D)

\'t\' <= \'s\'

ascii value of \'t\' is 116

ascii value of \'s\' is 115

116<=115

we can see that this statement is incorrect

so, answer is FALSE