Evaluate the following expression as either True or False taking into account operator precedence and indicate the operator sequence in which it was executed.(example: x = a* (b + c) sequense would be +*= ) Given: k = 5, j = 2 !((k+3 > 8 ) && ( j *3 <= 4 ))
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- Give the logical opposites of each of the following expressions; that is, give an expression that is False exactly when the given expression is True and vice versa. You may NOT use the not operator! 1. a == b 2. a <= b 3. a < 18 and day == 1 4. a >= 18 or day != 1Mark the following statements as true or false. i. An identifier can be any sequence of digits and letters. ii. In C++, there is no difference between a reserved word and a predefined identifier. iii. A C++ identifier can start with a digit. iv. The operands of the modulus operator must be integers. v. If a = 4; and b = 3; then after the statement a = b; the value of b is still 3. vi. The result of a logical expression cannot be assigned to an int variable. vii. Every if statement must have a corresponding else. viii. The expression in the if statement: if (score = 30) grade = 'A'; always evaluates to true. ix. The expression: (ch >= 'A' && ch = 'Z'. x. The expression !(x > 0) is true only if x is a negative number.Write a program that verifies the delimiters in a line of text or expression typed by theuser. In this case, we will take an arithmetic expression like a*(b+c)+[c/(a-b)]. Yourprogram needs to validate the expression such that opening and closing brackets areproper or not which means the brackets are balanced or not.
- Write a program that mimics a calculator. The program should take as input two integers and the operation to be performed. It should then output the numbers, the operator, and the result. For division, if the denominator is zero, output an appropriate message. Limit the supported operations to + -/ *and write an error message if the operator is not one of the supported operations. Here is some example output: 3 + 4 = 7 13 * 5 = 65 C++a) Write a subprogram ISALPHA that checks if a single ASCII character is alphabetic (i.e. between ’A’ and ’Z’ or between ’a’ and ’z’). The char is passed in R0. If the char is alphabetic R0 must be set to 1, to 0 otherwise. b) Write a program that reads a character from the console and prints a message to the console indicating whether the character is alphabetic, using the subprogram from part a.Consider the following expression using Racket: (= (string-length "hello world") (/ (+ 10 10) 5) ) 1) What data type does the above expression return when evaluated? a.) Boolean, b.) string, c.) Integer, d.) Real, e.) Complex 2) What is the first operation performed in the evaluation of the expression above? a.) The equality, ‘=’, is performed first. b.) The division, ‘/’, is performed first. c.) The addition, ‘+’, is performed first. d.) The string-length operation is performed first. e.) The first operation performed depends on the operating system in use.
- For the following statement, write down a logically equivalent statement which containsno operators other than ¬ and ∨: P ∧ (Q → R)Suppose x, y, and z are int variables and w and t are double variables. What are the values of all five variables after all the following statements have been executed? Hint, the mod operator is the same level of precedence as * and /, and be careful about integer division. x = 17; y = 15; x = x + y / 4; z = x % 3 + 4; w = 17 / 3 + 6.5; t = x / 4.0 + 15 % 4 - 3.5;Write a C++ program that (1) asks the user to input a year number expressed in theRoman notation, (2) validates whether it is an existing and valid Roman number (i.e. (a)whether it does not consist of letters other than IVXCM, and (b) it does not have morethan three such letters appearing one after the other) – if it is invalid for a reason (c) theprogram should issue a warning but still carry out the further processing, then (3) convertsthis year number into an ARABIC year number (for example it converts the yearexpressed as a ROMAN number (MCMXCIX) into Arabic 1999), and finally (4) displaysthe Arabic equivalent of this year.Hint: To achieve such a conversion, you need to know rules of formulation of Romannumbers. These rules are as follows:(1) Roman numbers are based on sum (or difference) of its components. They use thefollowing components: M = 1000,D = 500,C = 100,L = 50X = 10,V = 5,I = 1; (2) When a smaller component is placed in front of a larger component, it means that…
- What is the output assuming dynamic scoping and static scoping! Give answers for both dynamic and static! #include <iostream> using namespace std; int total = 5; int c = 3; int fun1(int); int fun2(int); int main() { int x = 2; int y = 8; cout << " variables x y and c have values: " << x <<" " << y << " " << c << endl; cout << "main: fun1(x) = " << fun1(x) << endl; cout << " After Call to fun1(x) variables x y and c have values: " << x <<" " << y << " " << c << endl; return 0; } int fun1(int a) { int b = 6; int c = 3; b = total + c + a; cout << "in fun1: b= " << b << endl; cout << "in fun 1 after call to fun2(total) the return value is " << fun2(total) << endl; return (b); } int fun2(int w) { c = c * 2; total = total + w + c; cout << "in fun2: total= " << total << endl; return(c); }Show the string that would result from each of the following string formatting operations. If the operation is not legal, explain why.171a) "Looks like {1} and {0} for breakfast " . format ("eggs" , "spam")b) "There is {0} {1} {2} {3}" . format (! , " spam" , 4, "you" )c) "Hello {0}" . format ("Susan" , "Computewell")d) " {0:0.2f} {0 :0.2f}" . format (2 . 3, 2 . 3468)e) " {7 . 5f} {7 . 5f}" . format (2 . 3, 2 . 3468)f) "Time left {0 : 02}:{1 : 05.2f}" . format ( 1 , 37 . 374)g) " {1:3}" . format("14")Compute the weakest preconditions of the following statements for the given postconditions. Assume all variables are integers1)a = 2*b + 1;b = a*a + 1;{ a > 10 } 2)if (b > 0)a = 4*b - 10;elsea = b + 172;{ a > 0 }
