Question

There is a 75 foot tall wall and the target is located 150 feet past it. The target is 50 feet wide - we will ignore the height of the target and assume that anything that lands within the area of its base would hit the target. The catapault always launches rocks at a 45 degree angle - to make life easy we will assume that they are launched from a height of 0 feet. Your program should read in a distance the catapault is from the wall (in feet) and an initial velocity for the rock it throws and report whether the shot: hits the wall, is too short, is too long, or hits the target. If the shot does not hit the wall, report how far it traveled in total. In particular, you will need the Parabolic Trajectory equation that gives a height for the rock after it travels x feet and the Range equation. Your program is reading in u (initial velocity). Use the value 32.17405 for g and 3.1419265359 for Pl.

#include
using namespace std;
int main()
{
   int testcase;
   cout<<"Enter no of testcase ";
   cin>>testcase;
   while(testcase--)
   {
    int distance,velocity;
    cout<<"Enter distance from wall: ";
    cin>>distance;
    cout<<"Enter velocity: ";
    cin>>velocity;
    double g=32.17405;
    double pi=3.1419265359;
    int dis_from_wall_to_target=distance+150;
    int dis_from_wall_with_target=distance+150+50;
     //d*(1-d*g/v*v)>height of wall then it cross the walll
    double height=distance*(1.0-((distance*g*1.0)/(velocity*velocity)));
    if(height>75)
    {
        //travel_distance=(v*v)/g when ball cross the wall then total travelled distance by ball
        double travel_distance=(velocity*velocity*1.0)/g;
        if(travel_distance         {
            cout<<"Too short!\n";
        }
        else if(travel_distance<=dis_from_wall_with_target)
        {
            cout<<"Hit!\n";
        }
        else
        {
            cout<<"Too far!\n";
        }
        cout<<"Rock traveled "<     }
    else
    {
        cout<<"Hits the wall!\n";
    }
   }
    return 0;
}

does the job without the variable pi! why do i need it ?

Please also provide with an alternative way of writing this code.

Answer 1

/* Actuall Working*/

#include <iostream>

using namespace std;

int main()
{
int testcase;
cout<<"Enter no of testcase ";
cin>>testcase;
while(testcase--)
{
int distance,velocity;
cout<<"Enter distance from wall: ";
cin>>distance;
cout<<"Enter velocity: ";
cin>>velocity;
double g=32.17405;
double pi=3.1419265359;
int dis_from_wall_to_target=distance+150;
int dis_from_wall_with_target=distance+150+50;
//d*(1-d*g/v*v)>height of wall then it cross the walll
double height=distance*(1.0-((distance*g*1.0)/(velocity*velocity)));
if(height>75)
{
//travel_distance=(v*v)/g when ball cross the wall then total travelled distance by ball
double travel_distance=(velocity*velocity*1.0)/g;
if(travel_distance <0) {
cout<<"Too short!\n";
}
else if(travel_distance<=dis_from_wall_with_target)
{
cout<<"Hit!\n";
}
else
{
cout<<"Too far!\n";
}
cout<<"Rock traveled "<<endl; }
else
{
cout<<"Hits the wall!\n";
}
}
return 0;
}

/* Screenshot of above code*/

EXPLAINATION:

pie value is not required as per the calculation.

It's working fine, if we commented the pi value..

As see the below output