【思考题】CSDN第四届在线编程大赛2014初赛:带通配符的数

题目要求：

输入参数：参数A，含有任意个数的?的数值字符串，如：12?4，?代表一位任意数
                    参数B，不含?的数值字符串，长度与参数A一致
输出结果：参数A比参数B大的可能数值个数

输入样例
36?1?8
236428
8?3
910
?
5

输出样例
100
0
4

#define num_max_length 20
int main(void)
{ 
	char num1[num_max_length];
	char num2[num_max_length];
	int result_temp=0, result=0;
	int num_length=0, num_index=0;
	int flag=0;

	while(1){
		memset(num1, 0, num_max_length);
		memset(num2, 0, num_max_length);
		result_temp=0;
		result = 0;
		flag = 0;

		printf("参数A:");
		fgets(num1, num_max_length, stdin);
		if(memcmp(num1, "end", 3)==0) break;
		printf("参数B:");
		fgets(num2, num_max_length, stdin);
		if(memcmp(num2, "end", 3)==0) break;
		if((num_length=strlen(num1))!=strlen(num2)){
			printf("num1 num2 length not match
");
			break;
		}

		for(num_index=0; num_index<num_length; num_index++){
			if(num1[num_index]=='?'){
				if(flag == 0)
					result_temp = (int)('9'-num2[num_index])+result_temp*10;
				else
					result_temp = result_temp*10;
			}
			else{
				if(num1[num_index]==num2[num_index]){
					continue;
				}
				else if(num1[num_index]<num2[num_index]){
					//break;
					if(flag == 0){
						flag = 1;
					}
				}
				else{
					if(flag == 0){
						flag = 1;
						result_temp += 1;
					}
				}
			}
		}
		printf("参数A比参数B大有%d种可能
", result_temp);
	}

	printf("用户终止程序
");
	system("pause");

	return 0;
}