# C 程序：檢查阿姆斯特朗數 > 原文： [https://beginnersbook.com/2014/06/c-program-to-check-armstrong-number/](https://beginnersbook.com/2014/06/c-program-to-check-armstrong-number/) 如果數字的各位的立方和等于數字本身，則將數字稱為阿姆斯特朗數。在下面的 C 程序中，我們檢查輸入的數字是否是阿姆斯特朗數。 ```c #include<stdio.h> int main() { int num,copy_of_num,sum=0,rem; //Store input number in variable num printf("\nEnter a number:"); scanf("%d",&num); /* Value of variable num would change in the below while loop so we are storing it in another variable to compare the results at the end of program */ copy_of_num = num; /* We are adding cubes of every digit * and storing the sum in variable sum */ while (num != 0) { rem = num % 10; sum = sum + (rem*rem*rem); num = num / 10; } /* If sum of cubes of every digit is equal to number * itself then the number is Armstrong */ if(copy_of_num == sum) printf("\n%d is an Armstrong Number",copy_of_num); else printf("\n%d is not an Armstrong Number",copy_of_num); return(0); } ``` **輸出：** ```c Enter a number: 370 370 is an Armstrong Number ``` 您可以像這樣驗證結果： ```c 370 = 3*3*3 + 7*7*7 + 0*0*0 = 27 + 343 + 0 = 370 ``` 如您所見，數字 370 的各位立方和等于數字本身。