【每日刷题】数据结构起步自测题 自测-4 Have Fun with Numbers （20 分)

题目描述：


代码如下：

//数据结构起步能力自测04
#include 
#include 
int main ( void )
{
	char s[21], s1[22];
	gets( s );
	int a[10] = {0}, b[10] = {0}, i, len;
	len = strlen( s );
	for( i = 0; i < len; i++ ){
		int temp = s[i] - '0';
		a[temp] = 1;
	}
	int r, d = 0, j = 0;
	for( i = len - 1; i >= 0; i-- ){
		int temp = s[i] - '0';
		temp = temp * 2 + d;
		r = temp % 10;
		d = temp / 10;
		s1[j++] = r + '0'; 
		if( i == 0 && temp > 9 ){
			s1[j++] = d + '0';
		}
	} 
	s1[j] = '\0';
	int len1 = strlen( s1 );
	char t;
	for( i = 0; i < len1 / 2 ; i++ ){
		t = s1[i];
		s1[i] = s1[ len1 - 1 - i];
		s1[ len1 - 1 - i ] = t;
	}
	for( i = 0; i < len1; i++ ){
		int temp = s1[i] - '0';
		b[temp] = 1;
	}
	int flag = 1;
	for( i = 0; i < 10; i++ )
		if( a[i] != b[i] ){
			flag = 0;
			break;
		}
	if( flag == 1 )
		printf( "Yes\n" );
	else
		printf( "No\n" );
	printf( "%s", s1 );
	return 0;
} 

这道题主要需要解决的核心是用字符串模拟数字乘法的过程。