C++程式:查詢數字的奇數因子的和
給定一個正整數,任務是生成該數字的奇數因子並計算這些奇數因子的和。
示例
Input-: number = 20 Output-: sum of odd factors is: 6 Input-: number = 18 Output-: sum of odd factors is: 13

因此,結果 = 1 + 5 = 6
下面程式中使用的演算法如下 −
- 輸入數字以計算該數字的奇數因子的和
- 忽略數字0和2,因為它們是偶數,並存儲數字1,因為它是奇數
- 從3開始迴圈到數字的平方根
- 遍歷直到number % i 返回0,並繼續用i的值除以number
- 在迴圈中,將臨時變數的值設定為temp = temp * i
- 將total設定為total + temp
- 返回最終res變數的值並列印結果
演算法
START Step 1-> Declare function to calculate sum of odd factors int sum(int num) declare int res = 1 Loop While(num % 2 == 0) set num = num / 2 End Loop For int i = 3 and i <= sqrt(num) and i++ declare int count = 0 and total = 1 declare int temp = 1 Loop while (num % i == 0) count++ set num = num / i set temp *= i set total += temp End set res = res*total End IF (num >= 2) set res *= (1 + num) End return res Step 2-> In main() Declare int num = 20 call sum(num) STOP
示例
#include <bits/stdc++.h>
using namespace std;
//calculate sum of odd factors
int sum(int num) {
int res = 1;
while (num % 2 == 0)
num = num / 2;
for (int i = 3; i <= sqrt(num); i++) {
int count = 0, total = 1 ;
int temp = 1;
while (num % i == 0) {
count++;
num = num / i;
temp *= i;
total += temp;
}
res = res*total;
}
if (num >= 2)
res *= (1 + num);
return res;
}
int main() {
int num = 20;
cout<<"sum of odd factors is : ";
cout <<sum(num);
return 0;
}輸出
sum of odd factors is : 6
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