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JavaScript program to find the maximum possible value by rotating the digits of a given number

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Release: 2023-09-03 20:45:06
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JavaScript 程序通过旋转给定数字的数字来查找可能的最大值

We will write a program to find the maximum possible value by rotating the digits of a given number. We'll use a loop to break the numbers into individual numbers and rearrange them in a way that gives us the maximum value. The loop will continuously rotate the numbers and keep track of the highest value obtained until all possible rotations have been evaluated. The maximum value obtained during this process will be returned as the result.

method

To find the maximum possible value by rotating the digits of a given number, follow these steps -

  • Convert a number to a string to access its individual digits.

  • Create an array containing all possible number rotations.

  • Sort the array in non-ascending order.

  • Convert the largest element in the array back to a number.

  • Return the largest number.

  • To handle negative numbers, you should first determine the sign of the largest number and then convert it back to a number.

Example

This is an example of a JavaScript program to find the maximum possible value by rotating the digits of a given number -

function maxRotate(num) {
   num = num.toString();
   let max = num;
     
   for (let i = 0; i < num.length - 1; i++) {
      num = num.slice(0, i) + num.slice(i + 1) + num[i];
      if (num > max) {
         max = num;
      }
   }
    
   return max;
}
console.log(maxRotate(38596));
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illustrate

  • Function maxRotate accepts a number num as a parameter and converts it to a string.

  • declares the variable max and assigns it the value of num. This variable will store the maximum possible value by rotating the number num.

  • The for loop is used to iterate over num numbers. For each iteration, reassemble the num string by removing the number at index i, concatenating the remaining numbers, and then adding the removed number back to the end of the string.

  • After each iteration, compare the value of num with the value of max. If num is greater than max, assign the value of num to max.

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  • Finally, the function returns the value of max after all iterations are completed. In this example, when the function is called with the argument 38596, the return value is 956638, which is achieved by rotating 38596.

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source:tutorialspoint.com
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