Question

1. Write the C++ code for a program that calculates how many days are left until Halloween, when given as an input how many weeks are left until Halloween. Use variables named weeks and days.

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2. What header file must be included

- To perform mathematical functions like sqrt?

- To use cin and cout?

- To use stream manipulators like setprecision?

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3. What value will be stored in the variable t after each of the following statements executes?

1. t = (12 > 1);

2. t = (2 < 0);

3. t = (5 == (3 * 2));

4. t = ( 5 == 5);

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4. Convert the following conditional expression into an if/else statement:
q = (x < y) ? (a+b) : (x * 2);

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5. Write a function named getNumber which uses a reference parameter to accept an integer argument. The function should prompt the user to enter a number in the range of 1 through 100. The input should be validated and stored in the parameter value.

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6. Write a C++ statement that prints the message “The number is valid.” If the variable temperature is within the range -50 through 150

Answer 1

Code:

#include<iostream>
using namespace std;
int main(){
//   declare variables
   int weeks,days;
  
//   take input from user number of weeks
   cout<<"Enter number of Weeks left until Halloween : ";
   cin>>weeks;
  
//   calculate number of days
   days = 7*weeks;
  
//   print the days
   cout<<endl<<days<<" days are left until Halloween";

   return 0;
}

Code::

#include<iostream>
using namespace std;

//functin that reads the data from user
void getNumber(int *n){
   int x;
   cout<<"Enter a number in the range of 1 through 100. : ";
   cin>>x;
   if(x>=1 || x<=100){
      
       *n = x;
   }
  
  
}

int main(){
  
   int n;
  
//   call the function getNumber pass the reference of n
   getNumber(&n);
  
   return 0;
}

Code:

#include<iostream>
using namespace std;
int main(){
  
   int temp;
  
//   prompt the user for number
   cin>>temp;
  
//   check if the number is in range of -50 to 150
  
   if(temp>=-50 && temp<=150){
      
       cout<<"The number is valid.";
   }
  
   return 0;
}