我的程序规格如下。1.所有四个数字都不同。2.千位数字是十位数的三倍。3.数字是奇数。4.数字的总和是27。我遗漏了整个程序的一些代码。它具有干净的编译器,但在运行时会自动终止。我认为问题出在数据类型的转换中。
int randomNumber = rand.nextInt(9000) + 1000;
String randomString;
boolean found = true;
while (found)
{
// converting to string to find position of digits and value
randomString = String.valueOf(randomNumber);
// converting to char to transfer back to in while knowing the position of the digits
char position0a = randomString.charAt(0);
char position1a = randomString.charAt(1);
char position2a = randomString.charAt(2);
char position3a = randomString.charAt(3);
// coverted back to int
int position0 = Character.getNumericValue(position0a);
int position1 = Character.getNumericValue(position1a);
int position2 = Character.getNumericValue(position2a);
int position3 = Character.getNumericValue(position3a);
int sumCheck = position0a + position1a + position2a + position3a;
int digit30Check = 3 * position2;
//checking addition to 27
String sumCheck27 = "27";
String sumCheck28 = String.valueOf(sumCheck);
// checking all digits are different
if (position0 != position1 && position0 != position2 && position0 != position3 &&
position1 != position2 && position1 != position3 && position2 != position3)
{
if (position3 != digit30Check) // check if the digit in the thousands place 3 * tens
{
if (sumCheck27.equals(sumCheck28)) // check if the sum is 27
{
if (position0 != 1 && position0 != 3
&& position0 != 5 && position0 != 7 &&
position0 != 9 && position1 != 1 && position1 != 3
&& position1 != 5 && position1 != 7 &&
position1 != 9 && position2 != 2 && position2 != 3
&& position2 != 5 && position2 != 7 &&
position2 != 9 && position3 != 3 && position3 != 3 &&
position3 != 5 && position3 != 7 && position3 != 9)
{
// checks for odd digits
found = false;
System.out.println(randomNumber);
}
else
randomNumber = rand.nextInt(9000) + 1000;
}
else
randomNumber = rand.nextInt(9000) + 1000;
}
else
randomNumber = rand.nextInt(9000) + 1000;
}
else
randomNumber = rand.nextInt(9000) + 1000;
// end while
}
boolean found = false;
while (found)
仅此一项就确保了while循环将永远不会进入,因为它found
是错误的。while循环中的任何内容都没有任何区别,因为它将永远不会执行。
你可能想写
while (!found)
除了此错误外,您的情况也过于复杂。这是您可以简化它们的方法:
if ((position0 == (3 * position2)) && // note that position0 is the "thousands place", not position3
((position0+position1+position2+position3) == 27) && // sum of digits
(position3 % 2 == 1) && // odd number
(position0 != position1 && position0 != position2 && position0 != position3 &&
position1 != position2 && position1 != position3 && position2 != position3)) { // different digits
found = true;
}
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