在C++中如何将文本中的文本转换为数字？？？

[blackwind]

比如将"120.4"转换为数字120.4

[panjet]

float result;
result=atof("120.4");

[gddsky]

在C++中
float x;
istrstream in("222.333");
in>>x;

[comstar]

Converts string to double floating point

double strtod(const char *s, char **endptr);

Returns the value of s as a double, where s is
a sequence of characters.
//
Converts string to double floating point

double strtod(const char *s, char **endptr);

Prototype in stdlib.h

Returns the value of s as a double, where s is
a sequence of characters. The string must
match the following format: