C语言中如何将字符串转换成float和double类型

2014-11-24 02:01:49 · 作者: · 浏览: 3

C语言中如何将字符串转换成float和double类型


先贴上可编译运行的源代码:


file: a.cpp


#include


#include
int main ()
{
char szOrbits[] ="365.24";
char* pEnd;
float f1;
f1 = strtof (szOrbits, &pEnd);
printf("%f\n",f1);
return 0;
}


执行结果:


[tuxedo@imorcl yali_test]$ g++ a.cpp -o aaa
[tuxedo@imorcl yali_test]$ ./aaa
365.239990



man参考手册:在linux上 man strtod就能显示


NAME
strtod, strtof, strtold - convert ASCII string to floating point number


SYNOPSIS
#include


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


#define _XOPEN_SOURCE=600 /* or #define _ISOC99_SOURCE */
#include


float strtof(const char *nptr, char **endptr);
long double strtold(const char *nptr, char **endptr);


DESCRIPTION
The strtod(), strtof(), and strtold() functions convert the initial portion of the string pointed to by nptr to double, float, and
long double representation, respectively.


。。。


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