執行結果：程式碼如下：#include <stdio.h>#include <stdlib.h>int main(){int number = 0, sum = 0;printf("請輸入一個整數：");scanf("%d", &number);while (number != 0) {int n = number % 10;printf("%d", n);sum += n;number /= 10;}printf("\n各位數字之和為：%d\n", sum);system("pause");return 0;}

先寫出其倒序，然後求其和。

具體程式程式碼如下：#include "stdio.h"int main (){int x,y; //x是原數字，y是倒序後的數字printf("請輸入原數字:");scanf("%d",&x) ;if(x>9999) printf("輸入數字不能超過9999");else{for(y=0;x!=0;x=x/10 )y=y*10+x%10;}printf("倒序後的數字是：%d",y);system("pause");}