C程式來檢查完全過剩數
對於給定的 n 位數 x,我們的任務是檢查給定的數是否是完全過剩數。為了檢查這個數是否是完全過剩數,我們找到每個數字 d 的 n 次方 (d^n),然後對所有數字求和,如果總和等於 n,則該數是完全過剩數。完全過剩數就像查詢任何數的阿姆斯特朗數。
在下方的示例中

示例
Input: 163 Output: Number is not a perfect_number Explanation: 1^3 + 6^3 + 3^3 is not equal to 163 Input: 371 Output: Number is a perfect_number Explanation: 3^3 + 7^3 +1^3 is equal to 371
下面使用的演算法如下 −
- 第一步是對給定的輸入進行計數,找出數字的個數。
- 第二步是按輸入中數字的位數,對數字進行求冪。
- 第三步是將所有數字進行相加,並檢查是否相等。
演算法
Start In function int power(int a, int b) Step 1-> Declare and initialize power as 1 Step 2-> Loop While b>0 Set power = power * a Decrement b by 1 Step 3-> return power End function power In function int count(int n) Step 1-> Declare and Initialize i as 0 Step 2-> Loop While n!=0 Increment i by 1 Set n = n/10 End Loop Step 3-> Return i In function int perfect_number(int n) Step 1-> Declare and initialize x as count(n) Step 2-> Declare and initialize rem as 0 and m as 0 Step 3-> Loop While(n) Set rem as n %10 Set m as m + power(rem, x) Set n as n/ 10 End Loop Step 4-> Return m End Function perfect_number In Function int main(int argc, char const *argv[]) Step 1-> Initialize n as 1634 Step 2-> If n == perfect_number(n) then, Print "Number is a perfect_number " Step 3-> else Print "Number is not a perfect_number " End if End main Stop
示例
#include <stdio.h>
int power(int a, int b) {
int power =1;
while(b>0) {
power *= a;
b--;
}
return power;
}
int count(int n) {
int i=0;
while(n!=0) {
i++;
n = n/10;
}
return i;
}
int perfect_number(int n) {
int x = count(n);
int rem = 0, m=0;
while(n) {
rem = n %10;
m += power(rem, x);
n /= 10;
}
return m;
}
int main(int argc, char const *argv[]) {
int n = 1634;
if(n == perfect_number(n)) {
printf("Number is a perfect_number
");
}
else
printf("Number is not a perfect_number
");
return 0;
}輸出
如果執行以上程式碼,它將會生成以下輸出 −
Number is a perfect_number
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