大数加法运算

void add(char a[],char b[]){
	/*********************装换*********************/
	int num1[LEN];
	int num2[LEN];
	for (int i = 0; i < LEN; i++){
		num1[i] = 0;
		num2[i] = 0;
	}
	int lena = strlen(a);
	int lenb = strlen(b);

	for (int i = lena - 1,j = 0; i >= 0; i--){
		num1[j++] = a[i] - '0';
	}

	for (int i = lenb - 1,j = 0; i >= 0; i--){
		num2[j++] = b[i] - '0';
	}
	for (int i = 0; i < LEN; i++){
		num1[i] += num2[i];
	}
	/*****************求和*******************/
	for (int i = 0; i < LEN; i++)
	{
		if (num1[i] >= 10){
			num1[i + 1] += num1[i] / 10;
			num1[i] %= 10;
		}
	}
/************打印************************/
	int i;
	for (i = LEN - 1; i > 0; i--){
		if (num1[i] != 0)
			break;
	}
	for (; i >= 0; i--)
		cout << num1[i];
	cout << endl;
}