大数相加

大数相加，转的算法很明显：

#include <stdio.h>
#include <string.h> 

char a[105],b[105]; 

char* add(char *a,char *b)
{
	int i,j,k = 0,tmp[105],l1 = strlen(a),l2 = strlen(b);
	for (i = l1-1,j = l2-1;i >= 0 && j >= 0;--i,--j)        
		tmp[k++] = a[i]+b[j]-'0'-'0';    
	for (;i >= 0;--i)        
		tmp[k++] = a[i]-'0';    
	for (;j >= 0;--j)        
		tmp[k++] = b[j]-'0'; 
	tmp[k] = 0;    
	for (i = 0;i < k;++i)
	{
		tmp[i+1] += tmp[i]/10;        
		tmp[i] %= 10;    
	} 

	if (!tmp[k])        
		--k;        
	for (i = 0;i <= k;++i)        
		a[i] = tmp[k-i] + '0';    
	a[k+1] = '\0';     
	return a;
} 

int main()
{    
	char *r;    
	while (scanf("%s%s",a,b) != EOF)
	{        
		r = add(a,b);
		printf("%s\n",r);
	}    
	return 0;
}