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   这个题不难，一定要注意一些特殊的数字，比如31 71 或 55 55 等;

#include
     
      #include 
      
       #include
       
        int main(){    char a[20],b[20],temp[20];    while(scanf("%s%s",a,b) != EOF)    {        printf("%ld ",(atoi)(a) + (atoi)(b));        int la =strlen(a),lb = strlen(b),ltemp;        int i,j;        //将位数长的付给a        if(la < lb)        {            strcpy(temp,a);            strcpy(a,b);            strcpy(b,temp);            ltemp = la;            la = lb;            lb = ltemp;        }        //将位数短的移位,并且在前面的空余位置给上字符'0'        for(i = la - 1, j = lb - 1; i >= la - lb; i--, j--)            b[i] = b[j];        for(i = 0; i < la - lb; i++)            b[i] = '0';        int result,flag = 0;//标记第一位是否为0        for(i = 0; i < la; i++)        {            result = (int)(a[i] - '0') + (int)(b[i] - '0');            if(result >= 10)                result = result - 10;            if(flag == 0 && result ==0)                continue;            else                flag = 1;            printf("%d",result);        }        if(flag == 0)            printf("0");        printf("\n");    }      return 0;}