uva 465 Overflow

#include<iostream>
#include<cctype>
#include<cstdlib>
#include<cstring>
#include<cstdio>
using namespace std;

const int MIN = -1u >> 1;

int main(){
    double a,b;
    char s1[1000],s2[1000];
    char c;
    while((scanf("%s %c %s",s1,&c,s2))!=EOF){
        printf("%s %c %s\n",s1,c,s2);
        a = atof(s1);
        b = atof(s2);
        if(a > MIN) printf("first number too big\n");
        if(b > MIN) printf("second number too big\n");
        if(c=='+'&&a+b>MIN)printf("result too big\n");
        if(c=='*'&&a*b>MIN)printf("result too big\n");
    }

    return 0;
}