高精度加法

#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
char a1[100],b1[100];
int a[100],b[100],c[100],lena,lenb,lenc,i,x;
memset(a,0,sizeof(a));
memset(b,0,sizeof(b));
memset(c,0,sizeof(c));
gets(a1);
gets(b1);
lena=strlen(a1);
lenb=strlen(b1);
for (i=0;i<=lena-1;i++)
a[lena-i]=a1[i]-48;
for (i=0;i<=lenb-1;i++)
b[lenb-i]=b1[i]-48;
lenc=1;
x=0;
while (lenc<=lena || lenc<=lenb)
{
c[lenc]=a[lenc]+b[lenc]+x;
x=c[lenc]/10;
c[lenc]%=10;
lenc++;
}
c[lenc]=x;
if (c[lenc]==0)
lenc--;
for (i=lenc;i>=1;i--)
printf("%d",c[i]);
return 0;
}