# include <stdio.h>
# include <conio.h>

int main()
{
    char str[100];
    gets(str);
    double num = 0;
    int i = 0;
    double t = 10;
    while(str[i]!='\0')
    {
        if(str[i]>='0'&&str[i]<='9')
        {
            if(t==10)
            num = num * t+str[i]-48;
            else
            {
                num+=(str[i]-48)*t;
                t = t*0.1;

            }
        }   
            if(str[i]='.')
            {
                t = 0.1;
            }
            i++;
        }
        if(str[0]=='-')
            num = 0 - num;
        printf("%lf\n",num);
        //count<<num<<endl;
        return 0;
    }
这个代码的目的是为了实现字符串和数字之间的相互转换，但是为什么不管我输入什么字符串结果就只是0.00000