这道题没啥别的毛病,我的错误在于看不懂题。
另外还有一点是注意浮点数存在-0
1 #include <stdio.h>
2 #include <ctype.h>
3 #include <math.h>
4 #define MAX_STR_LEN 10 + 5
5 double strToDouble(char str[]){
6 int state=0;
7 double sum1 = 0.0;
8 double sum2 = 0.0;
9 int k=1;
10 int digited=0;
11 int fuhao=1;
12 if(!str[0])return 0;
13 for(int i=0;str[i];i++){
14 if(digited==0&&str[i]=='-')
15 {
16 digited=1;
17 fuhao = -1;
18 }
19 if(digited==0&&str[i]=='+'){
20 digited=1;
21 fuhao = 1;
22 }
23 if(isdigit(str[i])){
24 digited=1;
25 if(!state)sum1=10*sum1 +str[i]-'0';
26 else sum2+=(pow(0.1,k++))*(str[i]-'0');
27 }
28 else if(str[i]=='.'){
29 digited=1;
30 state=1;
31 }
32 }
33 return fuhao*(sum1 + sum2);
34 }
35
36 int main()
37 {
38 char s[MAX_STR_LEN];
39 while(gets(s) != NULL)
40 printf("%lg\n", strToDouble(s));
41 return 0;
42 }