C库中的wcstof函数-yiteyi-C++库

函数的作用是：将str指向的宽字符串的初始部分转换为浮点值。str参数指向可以解释为数字浮点值的字符序列。这些函数在无法识别为数字一部分的第一个字符处停止读取字符串，也就是说，如果第一个字符是除数字以外的任何类型，则函数仅在该字符处终止。该字符可以是字符串末尾的wchar_t null字符。以“wcs”开头的标准库函数在wchar中声明。C.图书馆。 语法：

null

float wcstof (const wchar_t* str, wchar_t** endptr);Parameters :str : C wide string beginning with the representation of a floating-point number.endptr : Reference to an already allocated object of type wchar_t*, whose value is set by the function to the next character in str after the numerical value.This parameter can also be a null pointer.Return value : Floating point value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and is returned.

C

                         // C code to convert string having                       
                         // floating point as its content                       
                         // using wcstof function                       
           
                         #include <stdio.h>                       
           
                         // header file containing wcstof function                       
                         #include <wchar.h>                       
           
                         int                                     main()                       
                         {                       
                                                 // wide Character array to be parsed                       
                                                 wchar_t                                     str[] = L                                     "58.152 9.26"                                     ;                       
           
                                                 // Wide Character array to be parsed                       
                                                 wchar_t                                     * pEnd;                       
           
                                                 // float variable to store floating point values                       
                                                 float                                     f1, f2;                       
           
                                                 // Parsing the float values to f1 and f2                       
                                                 f1 = wcstof(str, &pEnd);                       
                                                 f2 = wcstof(pEnd, NULL);                       
                                                 f2 = 2 * f2;                       
           
                                                 // Printing parsed float values of f1 and f2                       
                                                 wprintf(L                                     "%.2f%.2f"                                     , f1, f2);                       
           
                                                 // operation being performed on the values parsed                       
                                                 wprintf(L                                     "Value of Pie is %.2f ."                                     , f1 / f2);                       
           
                                                 return                                     0;                       
                         }                       

输出：

58.1518.52Value of Pie is 3.14 .

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