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                # C 程序:在兩個間隔之間顯示阿姆斯特朗數 > 原文: [https://www.programiz.com/c-programming/examples/armstrong-number-interval](https://www.programiz.com/c-programming/examples/armstrong-number-interval) #### 在此示例中,您將學習查找用戶輸入的兩個整數之間的所有阿姆斯特朗數。 要理解此示例,您應該了解以下 [C 編程](/c-programming "C tutorial")主題: * [C `if...else`語句](/c-programming/c-if-else-statement) * [C `for`循環](/c-programming/c-for-loop) * * * 一個正整數稱為阿姆斯特朗數(`n`的階數),如果 ```c abcd... = a<sup>n</sup> + b<sup>n</sup> + c<sup>n</sup> + d<sup>n</sup> + ``` 對于 3 位的阿姆斯特朗數,每個數字的立方數之和等于數字本身。 例如,153 是阿姆斯特朗數,因為 ```c 153 = 1*1*1 + 5*5*5 + 3*3*3 ``` 在嘗試該程序之前,請學習如何[檢查整數是否為阿姆斯特朗數](https://www.programiz.com/c-programming/examples/check-armstrong-number)。 * * * ## 兩個整數之間的阿姆斯特朗數 ```c #include <math.h> #include <stdio.h> int main() { int low, high, number, originalNumber, rem, count = 0; double result = 0.0; printf("Enter two numbers(intervals): "); scanf("%d %d", &low, &high); printf("Armstrong numbers between %d and %d are: ", low, high); // iterate number from (low + 1) to (high - 1) // In each iteration, check if number is Armstrong for (number = low + 1; number < high; ++number) { originalNumber = number; // number of digits calculation while (originalNumber != 0) { originalNumber /= 10; ++count; } originalNumber = number; // result contains sum of nth power of individual digits while (originalNumber != 0) { rem = originalNumber % 10; result += pow(rem, count); originalNumber /= 10; } // check if number is equal to the sum of nth power of individual digits if ((int)result == number) { printf("%d ", number); } // resetting the values count = 0; result = 0; } return 0; } ``` **輸出** ```c Enter an integer: 1634 1634 is an Armstrong number. ``` 在程序中,外循環從(`low + 1`)**迭代到**(`high - 1`)。 在每次迭代中,都會檢查`number`是否是阿姆斯特朗數。 在外循環內部,首先計算一個整數的位數,并將其存儲在`count`中。 并且,各個數字的冪的總和存儲在`result`變量中。 如果`number`等于`result`,則該編號是阿姆斯特朗數。 **注意**:您需要在外循環的每次迭代中將`count`和`result`重置為 0。
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