WEEK:4 PROGRAMMING ASSIGNMENT 2 SOLUTION (Jan 2020-Apr2020) An Introduction to Programming through C++ NPTEL 2020

  

               An Introduction To Programming Through C++

IIT Bombay.

Week 4- Programming Assignment 2:

Write a program which simulates the movement of a turtle as follows:

At the beginning, the turtle is at the origin, i.e. point (0,0).  It is facing in the positive x direction. For the purpose of this exercise, let us assume that the coordinate axes are drawn as in mathematics, i.e. the x axis points in the East direction, and the y axis in the North direction.

The user can type commands to move the turtle.  The commands are:

     F : This causes the turtle to move 1 unit in the direction it

     is currently facing.

     L : This causes the turtle to turn left by 90 degrees.

     E : This causes the program to print the current coordinates of

     the turtle and stop execution.

You can assume that the user will not type any other letters besides the ones shown. Note that while there is no command to turn right, we can get the effect by using LLL, i.e. turning left thrice.

As an example, if the user input is "FFLLLFFLFE", then it will cause the turtle to move to (3,-2) and the program will print "3 -2" and stop.

Sample Test Cases

                               Input                  Output

Test Case 1     FFLLLFFLFE        3 -2

Test Case 2     FFFFLLLLFFE       6 0

WRITE/COPY THESE CODE DIRECTLY IN NPTEL TERMINAL AND COMPILE AND RUN THEN SUBMIT.

PROGRAM:

#include<iostream>

int main()
{
  char arr[100];int point[2]={0};
  int i=0,n=0;
  cin>>arr;

  while(arr[i]!='E')
  {
    if(arr[i]=='L')
    {
     n++;
     if(n==4)
     n=0;
    }

    if(arr[i]=='F')
      {

   if(n==1)
     {
  point[1]=point[1]+1;
     }
   else if(n==2)
     {
  point[0]=point[0]-1;

     }
   else if(n==3)
     {
  point[1]=point[1]-1;
     }

   else if(n==0)
     {
  point[0]=point[0]+1;
     }
    }

    i++;
  };


  cout<<point[0]<<" "<<point[1];

  return 0;
}

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