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It gives me following error: The operator == is undefined for the argument type(s)
boolean, int
Syntax error on tokens, delete these tokens
package javaproject;
public class NestedIFandIFandElse {
public static void main(String[] args) {
int vanus = 50;
if (vanus == 40) {
System.out.println("first if ");
} else {
System.out.print("first else");
if (vanus == 50 ∣∣ vanus == 20) {
System.out.println("second if");
} else {
System.out.println("second else");
}
}
}
}
You should change ∣∣ to ||. They look the same, but they aren't:
if (vanus == 50 || vanus == 20)
I'm not certain how you entered that symbol, but ∣∣ is not ||;
if (vanus == 50 || vanus == 20 ) { // <-- The || or works here.
I changed it as above, and it compiles here.
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package Fare;
import java.util.Scanner;
public class fare {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print(" Enter Class ");
System.out.println(" a. Senior b. Student c. Regular ");
System.out.println("Enter class : ");
int num = input.nextInt();
if (num = 1) {
double fare = 9 * 0.10;
System.out.println("Your fare will be " + fare + "▒. Thank you.");
}
else if (num = 2 ) {
double fare = 9 * 0.08;
System.out.println("Your fare will be " + fare + "▒. Thank you.");
}
else {
System.out.println("your fare will be 9▒. Thank you.");
}
}
}
Hi i can't seem to understand why there is an error in my if statement stating that it cannot convert int to boolean. I have already checked it and still can find any problem or mybe i just don't know.
You should change if(num=1) to if(num==1) and if else(num=2) to if else(num==2).
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I made this program on C,and I have no idea of Java (new-yοung developer).Can you help me to "translate" it on Java?
#include<stdio.h>
#include<stdlib.h>
#include<graphics.h>
void printbin(int num)
{
int binnum;
binnum=num%2;
num=num/2;
if (num!=0) printbin(num);
printf("%d",binnum);
return;
system("pause");
}
int main(void)
{
int posnumber,binnum;
printf("Give a number : ");
scanf("%d",&posnumber);
printbin(posnumber);
printf("\n");
return 0;
}
You can learn from this code, hope this can help you:
//here is comments in java
package help;
import java.util.Scanner;
//this is the way how you can all the libraries in java so
/*
#include<stdio.h>
#include<stdlib.h>
#include<graphics.h>
*/
//here name of your class
public class Help {
//here name of your methode
public static void printbin(int num) {
int binnum;
binnum = num % 2;
num = num / 2;
if (num != 0) {
printbin(num);
}
System.out.println(binnum);
}
//here is the main methode in java
public static void main(String args[]) {
int posnumber, binnum;
Scanner scan = new Scanner(System.in);
System.out.println("Give a number : ");
posnumber = scan.nextInt();
System.out.println(posnumber);
}
}
Good luck, and good start with java :)
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I am trying to have the code print out the highest of the three grades; however, the if/else statement in the highest method is finding an error in return d. I have tried putting if(d>b && d>c) return d, and also else return d. But both times the program says it is unreachable. Can someone explain what I'm doing wrong? Thank you!
import java.util.Scanner;
public class Methods2 {
public static double average(double a){
double ave= a/3.0;
return ave;
}
public static double highest(double b, double c, double d){
if(b>c && b>d)
return b;
if(c>b && c>d);
return c;
return d;//unreachable code
}
public static void main(String[] args){
Scanner kb= new Scanner(System.in);
System.out.println("Enter your name.");
String name = kb.nextLine();
System.out.println("Enter your three grades.");
double b= kb.nextDouble();
double c= kb.nextDouble();
double d= kb.nextDouble();
double av= average(b+c+d);
System.out.println(av);
double high= highest(b,c,d);
System.out.println(high);
}
}
Yes. Because semicolon makes it an empty if body.
if(c>b && c>d);
return c;
should be
if(c>b && c>d)
return c;
or (the arguably better)
if(c>b && c>d) {
return c;
}
You could also use Math.max(double, double) to make this a one line method like
public static double highest(double b, double c, double d) {
return Math.max(d, Math.max(b, c));
}
because of the semicolon in the second if
if(c>b && c>d);
That terminates the conditional statement right there and return c; becomes a statement that will get executed regardless of condition, remove it
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I am using java and having problem with my code. So for some reason when I compile my project on the 4th line it says error: '{' expected. resource says proj 2.java. Any help would be appreciated! thanks.
import java.io.*;
import java.util.*;
class proj 2 {
public static void main(String[] args)throws IOException {
BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in));
int a=0, b=0, c=0, d=0, f=0, totalNumber=0;
stars();
System.out.println("Enter a list of exam scores from 0-100 ");
System.out.println("use a negative one if you're done with your list:");
stars();
for(int grade=0;grade>=0;totalNumber++)
{
try
{
grade=Interger.parseInt(dataIn.readLine());
if(grade>=90 && grade<=100)
a++;
else if (Grade>=80 && grade<=89)
b++;
else if (grade>=70 && grade>=79)
c++;
else if (grade>=60 && grade<=69)
d++;
else if (grade>=0 && grade<=59)
f++;
else if (grade>100)
{
System.out.println("Invalid Grade");
totalNumber--;
}
}
catch(NumberFormatException e)
{
System.out.println("Invalid input. Please enter your score in number form.");
totalNumber--;
continue;
}
}
System.out.println("");
System.out.println("Total number of grades: " +(totalNumber-1));
System.out.println("A grades: " + a);
System.out.println("B grades: " + b);
System.out.println("C grades: " + c);
System.out.println("D grades: " + d);
System.out.println("F grades: " + f);
}
public static void stars()
{
System.out.println("**********************************************************************");
}
}
Change
class proj 2 {
to
class proj2 {
A class name can't have spaces.
Also change Interger to Integer and Grade to grade.
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My if, else statement is giving me an error that is telling me to delete the word else. What should I do?
import java.util.Scanner;
public class Test5 {
public static void main(String[] args) {
double GradeAverage;
{
System.out.print("Welcome! Please enter in your mid-year grade average.");
}
Scanner kbdln = new Scanner(System.in);
{
GradeAverage = kbdln.nextDouble();
{
if (GradeAverage > 60 && GradeAverage <= 100);
{
System.out.print("You're passing your class!");
}
else if (GradeAverage > 0 && GradeAverage <= 60)
{System.out.print("Hook up with a smart classmate and STUDY!");}
}
}
}
}
There should be no semi-colon after the if statements.
The if statement should be as follows:
if(GradeAverage > 60 && GradeAverage <= 100)
First, I would get rid of all those { } you are using. It is way too much. Although it is correct to use them to declare a local namespace and absolutely necessary to use them with your if-else statements. But it is better not to use local namespaces if you are not absolutely sure what you are doing.
The second thing is you have a ; after your if statement. Which will be interpreted as an ; = empty statement. So your follow up else is completely alone – and that's why your IDE tells you to remove the else.
Here is a version of your code a little cleaned up :)
public class Test5 {
public static void main(String[] args) {
double GradeAverage;
System.out.print("Welcome! Please enter in your mid-year grade average.");
Scanner kbdln = new Scanner(System.in);
GradeAverage = kbdln.nextDouble();
if (GradeAverage > 60 && GradeAverage <= 100) {
System.out.print("You're passing your class!");
} else if (GradeAverage > 0 && GradeAverage <= 60) {
System.out.print("Hook up with a smart classmate and STUDY!");
}
}
}