squared repeatedly. If this method produces an infinite cycle of numbers containing 4, the number is known as an unhappy number. We will look at the implementation of finding out whether a number is a happy num
Now that we understand how a happy number is defined, let’s implement Java methods to check whether a given number is a happy number. A number is sad if the sequence, which each sum of the digits’ square forms, contains a loop. In other words,given a number, if one step’s calcul...
happy number publicstaticbooleanhappyNum(intnum) {if(num < 0) {returnfalse; }intsum = 0;while(num > 0) { sum+= (num % 10) * (num % 10); num/= 10; }if(sum == 1) {returntrue; }if(sum == 4) {returnfalse; }returnhappyNum(sum); } defsquare(x):returnint(x) *int(x)...
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202. Happy Number【leetcode】java,hashSet,算法 202. Happy Number Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and ...
Write a Java program to check whether a given number is a happy number or unhappy number. Happy number: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1, or it loops endlessly in a cycle whi...
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