IT1050 -  Object Oriented Concepts - Tutorial 02 - Solved

Objectives : Convert C programs to C++

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Exercise 1 - Calculations 
 

Convert the C program given below which converts a length given in cm to inches to a C++ program. 

 

 

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard. 

 

 

e.g.  

float data1; int data2; scanf("%f", &data1); --> std::cin >> data1; 

scanf("%d", &data2); --> std::cin >> data2;  

 

 

You already know that printf() in C is std::cout in C++ e.g. 

printf("Hello World") --> std::cout << "Hello World"; 

 

 

2.54cm = 1 inch 

 

 

#include <stdio.h> void main(void)  

{ 

    float cm, inches; 

    printf("Enter a length in cm : ");     scanf("%f",&cm);     inches = cm / 2.54; 

    printf("Length in inches is %f \n", inches); }    
 

 

IT1050 – Object Oriented Concepts                                                                      Semester 1, 2020 
 

 

Exercise 2 - Selection 

 

 

Convert the C program given below which calculates an employee's salary to a C++ program. 

 

 

Input Type, Salary, otHours 

Type = 1 

OtRate = 1000 

Type = 2 

OtRate = 1500 

Type = 3 

OtRate = 1700 

 

 

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard. 

 

 

#include <stdio.h> void main(void) 

{ 

   double salary, netSalary;    int etype, otHrs, otRate;    printf("Enter Employee Type : ");    scanf("%d", &etype);    printf("Enter Salary  : ");    scanf("%f", &salary);    printf("Enter OtHrs : ");    scanf("%d", &otHrs);  

    

   switch (etype) {       case 1 :           otRate = 1000;           break;       case 2 :           otRate = 1500;           break;       default :           otRate = 1700;           break; 
IT1050 – Object Oriented Concepts                                                                      Semester 1, 2020 
 

 

   } 

  

   netSalary = salary + otHrs* otRate;    printf("Net Salary is %f ", netSalary); } 
 

Exercise 3 - Repeatition 
 

 

Convert the C program given below which calculates the Factorial of a number that you input from the keyboard to a C++ program. 

 

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard. 

 

#include <stdio.h> void main(void) 

{     int no;     long fac; 

 

    printf("Enter a Number : ");     scanf("%d", &no); 

 

    fac = 1; 

    for (int r=no; r >= 1; r--) {         fac = fac * r; 

    }  

    printf("Factorial of %d is %ld\n", no, fac);   

 

Exercise 4 - Functions 
Write a program to calculate the function called nCr which is defined as 

 nCr = n!/ r!(n−r)! 

 

Where n! is the factorial of n. 

 

Implement the functions long Factorial(int no); 

long nCr(int n, int r); 

 

 

Do not modify the main function. 

 

#include <iostream> 

 

long Factorial(int no); long nCr(int n, int r); 

 int main() {   int n, r; 

  std::cout << "Enter a value for n ";   std::cin >> n; 

  std::cout << "Enter a value for r ";   std::cin >> r;   std::cout << "nCr = ";   std::cout << nCr(n,r);   std::cout << std::endl; 

}