Question

This Compilation Errors Detected

File: ALIEN_23547/source/domain/World.java
Line: 153
while expected

File: ALIEN_23547/source/domain/World.java

Line: 158
reached end of file while parsing

WHERE IS THE ERROR? HOW TO CORRECT IT? PLEASE PINPOINT THE ERROR

import java.util.Scanner;

public class World {

public static void main (String [] args){

Scanner scan = new Scanner (System.in);

double masse = 80.0;

do{

System.out.print("masse du parachutiste(>=40)?");

masse =scan.nextDouble();

}while (masse<40.0);

double h0= 39000.0;

do{

System.out.print("hauter de depart du parachutiste(>=250)?");

h0 = scan.nextDouble();

}while(h0<250.0);

final double g =9.81;

double v0= 0;

double t0 =0;

double t = 0;

double hauter = h0;

double vitesse = 0;

double accel = g;

double s0 =2;

boolean max = false;

boolean depass = false;

boolean ouv = false;

double s;

double q;

do{

s = s0/masse;

q = Math.exp(-s*(t-t0));

vitesse = (g/s)*(1-q)+v0*q;

hauteur = h0-(g/s)*(t-t0)-(v0-(g/s))/s*(1-q);

accel =g-s*vitesse;

if (vitesse>343 && depass == false){

System.out.println("##Felix depasse la vitesse du son");

depass = true;

if (accel<0.5 && max == false){

System.out.println("Felix a attaint sa vitesse maximale");

max =true;

}

if(hauteur<2500 && ouv ==false && t !=0){

System.out.println("##Felix ouvre son parachute");

ouv =true;

}

System.out.format("%.0f, %.4f, %.4f, %.5f\n", t, hauteur, vitesse, accel);

t++;

}while(hauteur >=2500);

s0 =25;

s= s0/masse;

h0=hauteur;

v0= vitesse;

t0= t-1;

do{

q = Math.exp(-s*(t-t0));

vitessse = (g/s)*(1-q)+v0*q;

hauteur=h0-(g/s)*(t-t0)-(v0-(g/s))/s*(1-q);

accel =g-s*vitesse;

if (hauteur >2500){

if (hauteur <2500 && ouv == false && t != 0) {

System.out.println("## Felix ouvre son parachute");

ouv=true;

}

if(accel <0.5 && max == false){

System.out.println("##Felix a atteint sa vitesse maximale");

max =true;

}

}

if (hauteur >0){

System.out.format("%.0f, %.4f, %.4f, %.5f\n", t, hauter, vitesse, accel);

}

t++;

}while (hauteur>0);

clavier.close();

}

}

Answer 1

• Check the following statement in your code:

if (vitesse>343 && depass == false){

System.out.println("##Felix depasse la vitesse du son");

depass = true;

• The if body in not closed with }
• So, there will be one less } in the end. Since this if statment appears inside a do-while, The compiler expects you add a closing brace } at the end and add a while statement.
• After we rectify this error by adding a closing brace to the body of this if statement, we get more errors in the program
• Many of those errors are typos, like "hauteur" being misspelled as "hauter", "vitesse" being misspelled as "vitessse". This can be corrected by changing the spelling here and there.
• However, there is an undefined variable at the end, "clavier", this variable is not found anywhere in the program, removing it does not seem to produce any anamoly in the output. so let's just remove it.

modified code:

import java.util.Scanner;

public class World {

public static void main (String [] args){

Scanner scan = new Scanner (System.in);

double masse = 39.0;

do{

System.out.print("masse du parachutiste(>=40)?");

masse =scan.nextDouble();

}while (masse<40.0);

double h0= 39000.0;

do{

System.out.print("hauter de depart du parachutiste(>=250)?");

h0 = scan.nextDouble();

}while(h0<250.0);

final double g =9.81;

double v0= 0;

double t0 =0;

double t = 0;

double hauteur = h0;

double vitesse = 0;

double accel = g;

double s0 =2;

boolean max = false;

boolean depass = false;

boolean ouv = false;

double s;

double q;

do{

s = s0/masse;

q = Math.exp(-s*(t-t0));

vitesse = (g/s)*(1-q)+v0*q;

hauteur = h0-(g/s)*(t-t0)-(v0-(g/s))/s*(1-q);

accel =g-s*vitesse;

if (vitesse>343 && depass == false){

System.out.println("##Felix depasse la vitesse du son");

depass = true;
}

if (accel<0.5 && max == false){

System.out.println("Felix a attaint sa vitesse maximale");

max =true;

}

if(hauteur<2500 && ouv ==false && t !=0){

System.out.println("##Felix ouvre son parachute");

ouv =true;

}

System.out.format("%.0f, %.4f, %.4f, %.5f\n", t, hauteur, vitesse, accel);

t++;

}while(hauteur >=2500);

s0 =25;

s= s0/masse;

h0=hauteur;

v0= vitesse;

t0= t-1;

do{

q = Math.exp(-s*(t-t0));

vitesse = (g/s)*(1-q)+v0*q;

hauteur=h0-(g/s)*(t-t0)-(v0-(g/s))/s*(1-q);

accel =g-s*vitesse;

if (hauteur >2500){

if (hauteur <2500 && ouv == false && t != 0) {

System.out.println("## Felix ouvre son parachute");

ouv=true;

}

if(accel <0.5 && max == false){

System.out.println("##Felix a atteint sa vitesse maximale");

max =true;

}

}

if (hauteur >0){

System.out.format("%.0f, %.4f, %.4f, %.5f\n", t, hauteur, vitesse, accel);

}

t++;

}while (hauteur>0);

}

}

sample input and output: