UVA465

思路：使用atof函数，将字符串改成浮点数，这样就可以直接计算以及判断了

#include<stdio.h>#include<stdlib.h>#include<string.h>#define N 800 int main(){char s1[N], s2[N];char ch;double a;while (scanf("%s %c %s", s1, &ch, s2) != EOF){printf("%s %c %s\n", s1, ch, s2);if (atof(s1) > 2147483647)printf("first number too big\n");if (atof(s2) > 2147483647)printf("second number too big\n");if (ch == '+')a = atof(s1) + atof(s2);else if (ch == '*')a = atof(s1) * atof(s2);if (a > 2147483647)printf("result too big\n");}return 0;}/*取值范围:  int ：-2147483648 到 [phone]  long ：-9223372036854775808 到 +9223372036854775807  float ：1.5*10-45  到 3.4*1038  double：5.0*10-324  到 1.7*10308*/