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I want to have a string variable showing next to my int variable but it doesn't seem to work.
public class ThreeLittleNumbers {
public static void main(String[] argts) {
String as = "Number 1: ";
String bs = "Number 2: ";
String cs = "Number 3: ";
int a = 1;
int b = 3;
int c = 5;
String tot = "Total: ";
System.out.println(as+a);
System.out.println(bs+b);
System.out.println(cs+c);
System.out.println(tot);
System.out.print(a+b+c);
}
}
If I understand your question, then this
System.out.println(tot);
System.out.print(a + b + c);
should be
System.out.print(tot);
System.out.println(a + b + c);
When I make the change above, I get output like you seem to be asking for -
Number 1: 1
Number 2: 3
Number 3: 5
Total: 9
Another option would be to use printf and something like
System.out.printf("%s %d%n", tot, a + b + c);
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I am new to java, why a, b,c initialization are wrong in the following code.
public static void main(String[] args) {
if (args.length < 2)
throw new IllegalArgumentException ("we need 2 argumeents");
else {
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int c = a+b;
}
System.out.println(a + " + " + b + " = " + c);
}
Java works differently compared to JavaScript. Every {} block has an own variable scope. Variables defined inside a block are not visible outside.
public static void main(String[] args) {
{
int x=1;
System.out.println(x); // prints 1
}
{
int x=2;
System.out.println(x); // prints 2
}
// System.out.println(x); // error: cannot find symbol
}
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I'm just having a practise at some java coding and was wondering if there was a way to use a String if else statement to change change an integer, as the following doesn't like the c = a * b
int a, b, c;
Scanner sc = new Scanner(System.in);
System.out.println("Enter first number");
a = sc.nextInt();
System.out.println("Enter * + - or / ");
String d = sc.nextLine();
System.out.println("Enter second number");
b = sc.nextInt();
if (d.equals("*")){
c = a * b;
}
System.out.println(a + " " + d + " b " + " = " + c);
This happens because the variable "c" is initialized only if the conditional if (d.equals("*")) {...} is true, to solve this you have two options:
Just initialize "c" :
int a, b, c = 0;
or add else statement
if (d.equals("*")){
c = a * b;
}else {
c = 0;
}
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I need to convert these to Java:
Ive tried converting line by line for both and when I run it there is no output when it completes
def count_up_from (a,b):
start = a
end = b
count = start
while count <= end:
print(count , end = ',')
count = count + 1
return count
print(count_up_from(1,5), end = "," "\n")
print(count_up_from(3,6), end = "," "\n")
print(count_up_from(1,2), end = "," "\n")
//
def count_down_to (a,b):
start = a
end = b
count = start
while count >= end:
print(count , end = ',')
count = count - 1
return count
print(count_down_to(5,1), end = "," "\n")
print(count_down_to(6,3), end = "," "\n")
print(count_down_to(2,1), end = "," "\n")
//
I did a rough translation here of count_up_from
Your desired outcome is unclear, so its not possible to do perfectly. This should be enough to help you translate the second.
https://repl.it/repls/CoralOblongSyndrome
class Main {
public static void main(String[] args) {
countUpFrom(1,5);
System.out.println();
countUpFrom(3,6);
System.out.println();
countUpFrom(1,1);
System.out.println();
}
public static void countUpFrom(int a, int b) {
for (int i = a; i <= b; i++) {
System.out.print(i + ",");
}
}
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I want my fallingTime numbers to be limited to two decimal places. I used "String.format(%.2f)" but it is giving me an error message.
This is the error message:
Exception in thread "main" java.util.IllegalFormatConversionException: f != java.lang.String
at java.base/java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4426)
at java.base/java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2951)
at java.base/java.util.Formatter$FormatSpecifier.print(Formatter.java:2898)
at java.base/java.util.Formatter.format(Formatter.java:2673)
at java.base/java.util.Formatter.format(Formatter.java:2609)
at java.base/java.lang.String.format(String.java:3302)
at fallingDistance.main(fallingDistance.java:22)
public class fallingDistance {
public static double fallDistance(int fallingTime){
double distance;
double g = 9.8;
distance = (0.5*g*Math.pow(fallingTime, fallingTime));
return distance;
}
//public static void displayHeader(){
//System.out.println("Time\t\t\t\t\tDistance\n----\t\t\t\t\t--------");
//}
public static void main(String[] args){
//displayHeader();
for(int time = 1; time <= 10; time++){
System.out.println(time+ " seconds\t\t" + String.format("%.2f", fallDistance(time) + " meters"));
}
}
}
You had misplaced a bracket. The below should work.
for (int time = 1; time <= 10; time++) {
System.out.println(time + " seconds\t\t" + String.format("%.2f", fallDistance(time)) + " meters");
}
Replace + with ,
System.out.println(time + " seconds\t\t" + String.format("%.2f", fallDistance(time), " meters"));
I removed " meters" from the end of the code and put it after "%.2f" and that worked. The code looks like this now:
{System.out.println(time + " seconds\t\t" + String.format("%.2f meters", fallDistance(time)));}
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I want the age to be multiplied by 3 here is my code asking for the user to enter name and age...............................................
import java.util.Scanner;
class Lab1Part4 {
public static void main (String [] args) {
Scanner user_input =
int tripleAge;
String printMyName;
String firstName;
String secondName;
System.out.println("Please enter your first name ? ");
firstName = user_input.next ();
System.out.println("Please enter your second name? ");
secondName = user_input.next ();
printMyName = firstName + " " + secondName;
System.out.println( printMyName);
System.out.println("Enter your age ? ");
tripleAge = user_input.nextInt ();
}// end class
}// end main
You just need to do something like:
tripleAge = user_input.nextInt () * 3;
System.out.println(tripleAge);
Use * operator to multiply.
tripleAge = (user_input.nextInt () * 3);
System.out.println(tripleAge);