C 語言實例 - 判斷Armstrong數(阿姆斯壯數)
C 語言實例Armstrong 數，就是n位數的各位數的n次方之和等於該數，如：
153=1^3+5^3+3^3 1634=1^4+6^4+3^4+4^4
實例
#include <stdio.h>
int main()
{
int number, originalNumber, remainder, result = 0;
printf("輸入三位數: ");
scanf("%d", &number);
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += remainder*remainder*remainder;
originalNumber /= 10;
}
if(result == number)
printf("%d 是 Armstrong 數",number);
else
printf("%d 不是 Armstrong 數",number);
return 0;
}
運行結果：
輸入三位數: 371 371 是 Armstrong
實例 - 兩數之間的 Armstrong 數
#include <stdio.h>
#include <math.h>
int main()
{
int low, high, i, temp1, temp2, remainder, n = 0, result = 0;
printf("輸入兩個整數: ");
scanf("%d %d", &low, &high);
printf("%d 和 %d 之間的 Armstrong 數為: ", low, high);
for(i = low + 1; i < high; ++i)
{
temp2 = i;
temp1 = i;
// 計算
while (temp1 != 0)
{
temp1 /= 10;
++n;
}
while (temp2 != 0)
{
remainder = temp2 % 10;
result += pow(remainder, n);
temp2 /= 10;
}
if (result == i) {
printf("%d ", i);
}
n = 0;
result = 0;
}
return 0;
}
運行結果：
輸入兩個整數: 100 1000 100 和 1000 之間的 Armstrong 數為: 153 370 371 407
實例 - 使用函數判斷Armstrong 數
#include <stdio.h>
#include <math.h>
int checkPrimeNumber(int n);
int checkArmstrongNumber(int n);
int main()
{
int n, flag;
printf("輸入正整數: ");
scanf("%d", &n);
// 檢測素數
flag = checkPrimeNumber(n);
if (flag == 1)
printf("%d 是素數。\n", n);
else
printf("%d 不是素數\n", n);
// 檢測 Armstrong 數
flag = checkArmstrongNumber(n);
if (flag == 1)
printf("%d 是 Armstrong 數。", n);
else
printf("%d 不是 Armstrong 數。",n);
return 0;
}
int checkPrimeNumber(int n)
{
int i, flag = 1;
for(i=2; i<=n/2; ++i)
{
// 非素數條件
if(n%i == 0)
{
flag = 0;
break;
}
}
return flag;
}
int checkArmstrongNumber(int number)
{
int originalNumber, remainder, result = 0, n = 0, flag;
originalNumber = number;
while (originalNumber != 0)
{
originalNumber /= 10;
++n;
}
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += pow(remainder, n);
originalNumber /= 10;
}
// 判斷條件
if(result == number)
flag = 1;
else
flag = 0;
return flag;
}
輸出結果為：
輸入正整數: 371 371 不是素數 371 是 Armstrong 數。