JAVAAAAAAA CAN SOMEBODY HELP ME FIX THIS!!!!!!!????????? /** * This method conve
ID: 3914529 • Letter: J
Question
JAVAAAAAAA
CAN SOMEBODY HELP ME FIX THIS!!!!!!!?????????
/**
* This method converts a String representing a base (or radix) 26 number into a decimal (or
* base 10) number. The String representation of the base 26 number uses the letters of the
* Latin alphabet to represent the 26 digits. That is, A represents 0, B represents 1, C
* represents 2, ..., Y represents 24, and Z represents 25.
*
* A couple of examples:
* BAAA = 1 * 26^3 + 0 * 26^2 + 0 * 26^1 + 0 * 26^0 = 17576
* ZERTY = 25 * 26^4 + 4 * 26^3 + 17 * 26^2 + 19 * 26^1 + 24 * 26^0 = 11506714
*
* For this method:
* - use Math.pow to calculate the powers of 26.
* - don't assume that the input is in any particular case; use toUpperCase().
* - don't check that the input is only 'A' to 'Z'.
* - calculate the value of each digit relative to 'A'.
* - start from either the first or last character, and calculate the exponent based on the
* index of each character.
*
* @param coord The coordinate value in base 26 as described above.
* @return The numeric representation of the coordinate.
*/
public static int coordAlphaToNum(String coord) {
int ans = 0;
for(int i=0; i<coord.length(); i++) {
int e = Character.toUpperCase(coord.charAt(i)) - 'A';
ans = ans + e*(int)Math.pow(26, coord.length()-i-1);
}
return ans;
}
WHEN I GET IT THROUGH TESTING FILES...
public class TestBattleship {
public static void main(String[] args) {
// Milestone 1
testCoordAlphaToNum();
testCoordNumToAlpha();
// Milestone 2
testCheckWater();
testPlaceShip();
// Milestone 3
testTakeShot();
testCheckLost();
}
private static void testCoordAlphaToNum() {
int numTests = 4;
int passed = numTests;
int res;
if((res = Battleship.coordAlphaToNum("BAAA")) != 17576) {
System.out.println("FAILED: Battleship.coordAlphaToNum("BAAA") != 17576, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("ZERTY")) != 11506714) {
System.out.println("FAILED: Battleship.coordAlphaToNum("ZERTY") != 11506714, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("zerty")) != 11506714) {
System.out.println("FAILED: Battleship.coordAlphaToNum("zerty") != 11506714, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("&é"")) != -14747) {
System.out.println("FAILED: Battleship.coordAlphaToNum("&é\"") != -14747, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("baaa")) != 17576) {
System.out.println("FAILED: Battleship.coordAlphaToNum("baaa") != 17576, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("ABCDE")) != 731) {
System.out.println("FAILED: Battleship.coordAlphaToNum("ABCDE") != 17576, but " + res);
passed--;
}
System.out.println("testCoordAlphatoNum: Passed " + passed + " of " + numTests + " tests.");
}
ERROR COMES OUT AS..
FAILED: Battleship.coordAlphaToNum("&é"") != -14747, but -383999
FAILED: Battleship.coordAlphaToNum("ABCDE") != 17576, but 19010
Explanation / Answer
The answer is correct, you mistaken...
0×26^4 + 1×26^3 + 2×26^2 + 3 ×26^1 + 4 x 26^0 = 19010
Check condition...
If you write if((res = Battleship.coordAlphaToNum("ABCDE")) != 19010) { then it will true...
public class TestBattleship {
public static void main(String[] args) {
// Milestone 1
testCoordAlphaToNum();
testCoordNumToAlpha();
// Milestone 2
testCheckWater();
testPlaceShip();
// Milestone 3
testTakeShot();
testCheckLost();
}
private static void testCoordAlphaToNum() {
int numTests = 4;
int passed = numTests;
int res;
if((res = Battleship.coordAlphaToNum("BAAA")) != 17576) {
System.out.println("FAILED: Battleship.coordAlphaToNum("BAAA") != 17576, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("ZERTY")) != 11506714) {
System.out.println("FAILED: Battleship.coordAlphaToNum("ZERTY") != 11506714, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("zerty")) != 11506714) {
System.out.println("FAILED: Battleship.coordAlphaToNum("zerty") != 11506714, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("&é"")) != -383999) {
System.out.println("FAILED: Battleship.coordAlphaToNum("&é\"") != -383999, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("baaa")) != 17576) {
System.out.println("FAILED: Battleship.coordAlphaToNum("baaa") != 17576, but " + res);
passed--;
}
if((res = Battleship.coordAlphaToNum("ABCDE")) != 19010) {
System.out.println("FAILED: Battleship.coordAlphaToNum("ABCDE") != 19010, but " + res);
passed--;
}
System.out.println("testCoordAlphatoNum: Passed " + passed + " of " + numTests + " tests.");
}
If you still have any doubts, please give me comment...
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