给定一个数字'n',我们需要检查给定的数字是否是强数。
强数是指其所有数字的阶乘之和等于数字'n'。阶乘是指将小于该数字的所有数字(包括该数字)相乘的结果,用!(感叹号)表示。例如:4!= 4x3x2x1 = 24。
因此,要确定一个数字是否是强数,我们需要提取数字的每一位,例如数字为145,则我们需要提取1、4和5,然后我们将计算每个数字的阶乘,即1!= 1,4!= 24,5!= 120。
现在我们将1 + 24 + 120相加,得到145,与给定的输入完全相同,因此我们可以说这个数字是强数。
Input: n = 124 Output: No it is not a strong number Explanation: 1! + 2! + 4! = 27 which is not equal to n i.e, 124 Input: n = 145 Output: Yes it is a strong number Explanation: 1! + 4! + 5! = 145
下面使用的方法如下来解决问题 −
我们将 −
START In Function int factorial(int r) Step1 -> Initialize int fact and set as 1 Step2-> Loop while r>1 Set fact as fact * r Decremnet r by 1 End Loop Step 3-> Return fact End Function factorial In Function int check(int n) Step 1-> Initialize int temp, rem and result, set result as 0 Step 2-> Set temp as n Step 3-> Loop while temp Set rem as temp % 10 Set result as result + factorial(rem) Set temp as temp/10 End loop Step 4-> If result == n then, Return 1 Step 5-> Else Return 0 End function check In main(int argc, char const *argv[]) Step 1-> Initialise and set n as 145 Step 2->If check(n) is valid then, Print "Yes it is a strong number” Step 3-> Else Print "no it is not a strong number” STOP
实时演示
#include <stdio.h> int factorial(int r) { int fact = 1; while(r>1) { fact = fact * r; r--; } return fact; } int check(int n) { int temp, rem, result = 0; temp = n; while(temp) { rem = temp % 10; result = result + factorial(rem); temp = temp/10; } if (result == n) return 1; else return 0; } int main(int argc, char const *argv[]) { int n = 145; if (check(n)) printf("Yes it is a strong number</p><p>"); else printf("no it is not a strong number</p><p>"); return 0; }
如果运行上述代码,将生成以下输出 −
Yes it is a strong number
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