fzu 1171 Hard to Believe, but True!

#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;

int main()
{
int i,len,a,b,c;
char s[100];
while(~scanf("%s",s))
{
a=b=c=0;
int len=strlen(s);
for(i=len-1;s[i]!='=';i--)
a=a*10+s[i]-'0';
i--;
for(;s[i]!='+';i--)
b=b*10+s[i]-'0';
i--;
for(;i>=0;i--)
c=c*10+s[i]-'0';
//printf("%d %d %d\n",a,b,c);
if(a==b+c) printf("True\n");
else printf("False\n");
}
return 0;
}