How can I apply string.format and printf to my output so that I can align it as per my assignment requirement?
I have 3 inputs to my method, 2 of which are char arrays which hold the two numbers, and an int array which holds their sum.
I have formatted the numbers and sum so that it is a string with appropriate commas interspersed. My task is to now align these outputs so that they always align themselves properly. The problem is I can't just set the column width to a specific number seeing as the inputs vary due to user input.
Ex: User inputs number1 and number2 (up to a max value of 30 digits), the program sums up the numbers and returns the total.
This is my code and current output:
import java.util.Scanner;
import java.util.Arrays;
public class Lab8{
public static void main(String[] args){
char[] num1 = {'9','2','3','8','7','4','8','6','7','2','9'};
char[] num2 = {'3','9','9','8','3','9','2','8','3','4','9','4','5','8'};
//getNumber("First Number: ");
//getNumber("Second Number: ");
//printArray(num1);
//System.out.println();
//printArray(num2);
int[] finalTotal = sumArrays(num1,num2);
//sumArrays(num1, num2);
printOutput(num1, num2, finalTotal);
}
//--------
/** Read a line of message from keyboard and return it as an array of char
@return: Array of characters
*/
public static char[] getNumber(String msg){
String myMessage;
System.out.print(msg);
Scanner input = new Scanner(System.in);
myMessage = input.nextLine();// Read a line of message
return myMessage.toCharArray();
}
public static int[] sumArrays(char[] num1, char[] num2){
int sum= 0, carry = 0, size = 0, min = 0;
if(num1.length > num2.length){
size = num1.length + 1;
min = num2.length;
}else{
size = num2.length + 1;
min = num1.length;
}
int[] sumArray = new int[size];
int i = num1.length-1;
int j = num2.length-1;
int k = size-1;
while(i >= 0 && j >=0){
sum = Character.getNumericValue(num1[i]) + Character.getNumericValue(num2[j]) + carry;
i--;
j--;
sumArray[k] = sum % 10;
sum = sum / 10;
carry = sum % 10;
k--;
}
while(i >= 0){
sum = Character.getNumericValue(num1[i]) + carry;
sumArray[k] = sum % 10;
sum = sum / 10;
carry = sum % 10;
i--;
k--;
}
while( j >= 0){
sum = Character.getNumericValue(num2[j]) + carry;
sumArray[k] = sum % 10;
sum = sum / 10;
carry = sum % 10;
j--;
k--;
}
sumArray[k] = carry;
int[] finalSum = new int[sumArray.length-1];
finalSum = printArray(sumArray);
return finalSum;
}
public static void printOutput(char[] num1, char[] num2, int[] sum){
char[] largest = new char[1];
char[] smallest = new char[1];
char[] tmp = new char[1];
if(num2.length > num1.length){
largest = num2;
smallest = num1;
}else{
largest = num1;
smallest = num2;
}
String number1 = formatString(largest);
String number2 = formatString(smallest);
String total = formatString(sum);
System.out.printf("%s%n", number1 + " +");
for(int i = 0; i < (number1.length() - number2.length()); i++){
System.out.print(" ");
}
System.out.printf("%s%n%s%n%s", number2, totalLine(sum),total);
}
public static String formatString(char[] num){
String formattedString = "";
for(int i = 0; i < num.length; i++){
if(i == 0){
formattedString = num[num.length-1-i] + formattedString;
continue;
}
if(i % 3 == 0){
formattedString = "," + formattedString;
}
formattedString = num[num.length-1-i] + formattedString;
}
return formattedString;
}
public static String totalLine(int[] num){
String totalLine = "";
for(int i = 0; i < num.length; i++){
totalLine = "- " + totalLine;
}
return totalLine;
}
public static String formatString(int[] num){
String formattedString = "";
for(int i = 0; i < num.length; i++){
if(i == 0){
formattedString = num[num.length-1-i] + formattedString;
continue;
}
if(i % 3 == 0){
formattedString = "," + formattedString;
}
formattedString = num[num.length-1-i] + formattedString;
}
return formattedString;
}
public static int[] printArray(int[] arr){
int[] sum = new int[arr.length-1];
if(arr[0] == 0){
for(int i = 1; i < arr.length; i++){
sum[i-1] = arr[i];
}
}else{
for(int i = 0; i < arr.length; i++){
sum[i] = arr[i];
}
}
return sum;
}
}
OUTPUT(wrong)
39,983,928,349,458 +
92,387,486,729
- - - - - - - - - - - - - -
40,076,315,836,187
OUTPUT(correct way)
39,983,928,349,458 +
92,387,486,729
--------------------
40,076,315,836,187
As you can see, my formatting is flawed. I'm totally unsure how to properly format this output so that it displays correctly every time even with differing number values. It should be formatted with the larger number above the smaller number and then a total line followed by the sum.
