<span>输入共两行，分别为a和b</span> 

<span>【输出格式】</span> 

<span>输出共一行，表示两个数的差,若a小于b，则先输出负号。</span> 

<span>【输入样例1】&nbsp;</span><span><br />

<span style="font-family:'Microsoft Yahei';font-size:14px;line-height:21px;background-color:#F5F5F5;">1111111111111111111111111111111111</span> 

<span>【输出样例1】</span> 

8888888888888888888888888888888888

C++解答

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main(){
	int a[256],b[256],c[256],lena,lenb,lenc,i;
	char s[256],s1[256],s2[256];
	memset(a,0,sizeof(a));
	memset(b,0,sizeof(b));
	memset(c,0,sizeof(c));
	gets(s1);
	gets(s2);
	if(strlen(s1)<strlen(s2)||(strlen(s1)==strlen(s2)&&strcmp(s1,s2)<0)){
		strcpy(s,s1);
		strcpy(s1,s2);
		strcpy(s2,s);
		cout <<"-";
	}
	lena=strlen(s1); lenb=strlen(s2); 
	for(i=0;i<=lena-1;i++) a[lena-i]=s1[i]-48;
	for(i=0;i<=lenb-1;i++) b[lenb-i]=s2[i]-48;
	for(i=1;i<=lena;i++){
		c[i]=a[i]-b[i];
		if (c[i]<0){
			c[i]+=10;
			c[i+1]--;
		} 
	}
	lenc=lena+1;
	while (c[lenc]==0) lenc--;
	for(i=lenc;i>=1;i--) {
	cout<<c[i];}
	cout<<endl;
	return 0;  
	
}