Question

C++ EXERCISES

(a) Given int a = 5, b = 2, c = 4, and d = 5; determine the value of the expression:

d % b * c > 5 || c % b * d < 7.   

(b) Which repetition statement is preferred for user data input and its validation?             

(c) Write a for statement to populate an array, double val[NUMCOUNT], for the following case: Use a counter named double count that has an initial value of 16.2, a final value of 0.4, and a decrement of 0.2 and populate the val[] array with the value of count.

What is the size, NUMCOUNT, of the array val[]?

Answer 1

Please find the answer below.
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For the given statement d % b * c > 5 || c % b * d < 7

Let's debug it one by one.

according to operator precedence , it will execute like below

first : d % b * c > 5

second : c % b * d < 7

after that OR of these two statements will be the final result.

Now resolve first one

d%b*c here * will execute first and % after that.

=d % b * c > 5

=5%2*4>5

=5%8>5

=0>5

=false

now let's see second statement.

c % b * d < 7

again lets see the value of

c % b * d<7

it will be

=4%2*5<7

=4%10<7

=0<7

=true

Hence final result will be or of these two output

that is false OR true= true

Hence it will result = 1

c++ output confirmation

2)

Do While loop is preferred for user input and validation.

suppose there is a requirement that ask a user number that should be greater than 0

than these can be handle easily with the help of while loop as below

do{

cin>>number;

}while(number<=0)

Above code will keep asking for number until positive number is not entered.

3)

In order to get the size, Following calculation can be used.

Starting value is : 16.2

Ending value is : .4

Difference is : 16.2-.4 = 15.8

so the value of NUMCOUNT willl be = 15.8/.2+1

= 79+1

=80

extra one is added due to zero base index.

And the for loop would be as below

#include <iostream>
using namespace std;

int main(void) {
   //initialize num count
   int NUMCOUNT=77;

   //declare array of double
   double val[NUMCOUNT];

   //index for subscripting
   int index=0;

   //loop for
   for(double count=16.2;count>=0.4;count-=.2){
       val[index] = count;
       index++;
   }
   return 0;
}