poj 大数 - 2602 Superlong sums

#include<stdio.h>
#define MAX 1000002
char num[MAX],num1[MAX];

int main(){
	int n,i;
	scanf("%d",&n);
	getchar();
	for(i=1;i<=n;i++){
		num[i] = getchar();
		getchar();
		num1[i] = getchar();
		getchar();
	
	}
	for(i=n;i>=1;i--){
		num[i] += num1[i]-'0';
		if(num[i]>'9'){
			num[i]-=10;
			num[i-1]+=1;
		}
	}
	for(i=1;i<=n;i++){
		putchar(num[i]);
	}
	printf("\n");
}