大数相加

#include<stdio.h>
#include<string.h>

#define N 100

int main()
{

    char a[N], b[N];
    int a_real[N], b_real[N], c[N + 1];

    int i, j, k = 0;
    int a_len, b_len;
    int max, min;
    int carry_bit = 0, total_bit = 0;

    memset(c, 0, sizeof(c));
    memset(a_real, 0, sizeof(a_real));
    memset(b_real, 0, sizeof(b_real));
    
    scanf("%s", &a);
    scanf("%s", &b);

    a_len = strlen(a);
    b_len = strlen(b);
    
    i = a_len - 1;
    j = b_len - 1;

    while(i != -1)
    {
        a_real[k++] = a[i--] - '0';
    }

    
    k = 0;
    while(j != -1)
    {
        b_real[k++] = b[j--] - '0';
    }

    max = a_len > b_len ? a_len : b_len;
    min = a_len > b_len ? b_len : a_len;

    for(i = 0; i < max; i++)
    {
        c[i] = a_real[i] + b_real[i] + carry_bit;

        if(c[i] > 9)
        {
            c[i] -= 10;
            carry_bit = 1;
        }
        else
        {
            carry_bit = 0;
        }
        
    }

    if(carry_bit)
    {
        c[max] = 1;
        total_bit = max + 1;
    }
    else
    {
        total_bit = max;
    }

    for(i = total_bit - 1; i >= 0; i--)
    {
        printf("c[%d]:%d\n", i, c[i]);
    }
    
}