This is the main step in this assignment. Create nested loops to print out the
numbers in a table format if the input is valid. The first input i defines the number
of rows, and the second input j defines the number of columns. Inside the loops,
write the code to list up the positive numbers from 1 to i*j. Use the
System.out.printf() function with "%4d" and "%4s" formats for the
integers and Strings.
I need to print out
Set the size of table and data-type (Type 'Q' or 'q' to quit): 3 4 "numbers"
-------------------
1 | 1 2 3 4
2 | 5 6 7 8
3 | 9 10 11 12
after i set the number of columns and rows but I can only get the inner table, not the outer numbers tables or stars. In order to get it to display correctly I had to alter it but it should be lined up and neat
Scanner scan = new Scanner(System.in);
String stringIn;
do
{
System.out.print("Set the size of table and data-type(Type Q or q to quit)");
stringIn = scan.nextLine();
int space = stringIn.indexOf(" ");
int spaceTwo = stringIn.indexOf(" ", space+1);
if(stringIn.length()>4)
{
String firstNum = stringIn.substring(0,space);
String secondNum = stringIn.substring(space+1,spaceTwo);
String dataType = stringIn.substring(spaceTwo+1);
int firstInt = Integer.parseInt(firstNum);
int secondInt = Integer.parseInt(secondNum);
if (!stringIn.equals("Q")&&!stringIn.equals("q")&&firstInt>=0&&secondInt>=0)
{
System.out.println(stringIn.substring(0,space) + " " + stringIn.substring(space+1,spaceTwo) + " " + stringIn.substring(spaceTwo+1));
}
else if(firstInt<0||secondInt<0)
{
System.out.println("Try again. The input was invalid");
}
for(int i = 1; i <firstInt+1; i++)
{
for (int j = 1; j < secondInt+1; j++)
{
System.out.printf("%4d", i*j);
System.out.printf("%4s", i*j);
}
System.out.println();
}
}
}
while(!stringIn.equals("Q")&&!stringIn.equals("q"));
This is my first Java class so my code is very messy.
You're pretty close, just a little off with the logic in your nested loop. This is what I modified:
1) Moved the column label outside the inner loop
2) Created a counter to use for the cell values
3) Use the counter to print the cell value & then incremented it
Code:
String headerRow= " * |";
String spacer = "-----";
for(int i=1; i<secondInt + 1; i++){headerRow+=" "+i; spacer+="----";}
System.out.println(headerRow);
System.out.println(spacer);
int counter = 1;
for (int i = 1; i < firstInt + 1; i++) {
System.out.printf("%4s", i + " |");
for (int j = 1; j < secondInt + 1; j++) {
System.out.printf("%4d", counter);
counter++;
}
System.out.println();
}
That code outputs this:
> 4 5 numbers
* | 1 2 3 4 5
> -------------------------
1 | 1 2 3 4 5
2 | 6 7 8 9 10
3 | 11 12 13 14 15
4 | 16 17 18 19 20