英文:
Multiplication table in Java using a method
问题
public static String multiplicationTable(int rows, int columns) {
StringBuilder result = new StringBuilder();
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= columns; j++) {
int num = i * j;
result.append(num).append("\t");
}
result.append("\n");
}
return result.toString();
}
public static void testMT() {
System.out.println("Testing Multiplication Table");
String expected = "1\t2\t3\t4\t\n2\t4\t6\t8\t\n3\t6\t9\t12\t\n";
System.out.print("Expecting:\n" + expected);
String actual = multiplicationTable(3, 4);
System.out.print("Actual:\n" + actual);
boolean correct = expected.equals(actual);
System.out.println("Outputs equal? " + correct);
}
英文:
Write a method that returns a multiplication table based on two input values that specify what two ranges of numbers to multiply together. For example, if the method were given 3 and 4 as input, it would return a string that when printed, would look like this:
1 2 3 4
2 4 6 8
3 6 9 12
Output Requirements:
Each number must be followed by a tab character.
Each line must be followed by a new line character (including the last row).
The columns and rows should range from 1 to the input number.
The method signature should look as follows:
public static String multiplicationTable(int rows, int columns){}
Call the testMT() method from main after completing this method to ensure it is working as expected.
public static String multiplicationTable(int rows, int columns) {
for(int i = 1; i <= rows; i++){
for(int j = 1; j <= columns; j++) {
int num = i * j;
String a = "" + num +"\t";
}
System.out.println("");
}
return String.format("%s", a);
}
public static void testMT() {
System.out.println("Testing Multiplication Table");
String expected = "1\t2\t3\t4\t\n2\t4\t6\t8\t\n3\t6\t9\t12\t\n";
System.out.print("Expecting:\n" + expected);
String actual = multiplicationTable(3, 4);
System.out.print("Actual:\n" + actual);
boolean correct = expected.equals(actual);
System.out.println("Outputs equal? " + correct);
}
Here is my output:
Testing Multiplication Table
Expecting:
1 2 3 4
2 4 6 8
3 6 9 12
Actual:
12 Outputs equal? false
I feel like I have the right setup but I can't figure out how to get the expected output.
答案1
得分: 0
您的multiplicationTable方法正在打印而不是返回结果。您可以像这样构建表格并返回它：
public static String multiplicationTable(int rows, int columns) {
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= columns; j++) {
int num = i * j;
sb.append(num).append('\t');
}
sb.append('\n');
}
return sb.toString();
}
没有其他更改，您将得到以下输出：
Testing Multiplication Table
Expecting:
1 2 3 4
2 4 6 8
3 6 9 12
Actual:
1 2 3 4
2 4 6 8
3 6 9 12
Outputs equal? true
英文:
Your multiplicationTable method is printing, and not quite legal. Build the table and return it. Something like,
public static String multiplicationTable(int rows, int columns) {
StringBuilder sb = new StringBuilder();
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= columns; j++) {
int num = i * j;
sb.append(num).append('\t');
}
sb.append('\n');
}
return sb.toString();
}
With no other changes, I then get
Testing Multiplication Table
Expecting:
1 2 3 4
2 4 6 8
3 6 9 12
Actual:
1 2 3 4
2 4 6 8
3 6 9 12
Outputs equal? true
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