atof(temp.c_str())

This is a C++ code snippet that converts a C++ string object "temp" to a double data type using the "atof()" function.

The "atof()" function is a standard C++ library function that converts a string containing a numerical value to a double data type. The "c_str()" function is used to convert the string object "temp" to a C-style string (i.e. a null-terminated character array) that is required as an argument to the "atof()" function.

Overall, this code allows the program to convert a string value to a floating-point value, which can be useful for various mathematical and computational operations.

相关问题

front_line.push_back(atof(str.c_str()));是什么意思

这是一段 C++ 代码，其中 `front_line` 是一个 vector 容器，`push_back` 是 vector 容器的一个成员函数，用于在 vector 容器的末尾添加元素。`atof` 是一个 C++ 标准库函数，用于将字符串转换为浮点数。`str.c_str()` 返回一个指向字符串 `str` 的指针，其中 `str` 是一个字符串对象。所以这行代码的含义是将字符串 `str` 转换为浮点数后添加到 `front_line` 的末尾。

PLCXProcess.cpp:3721:51: error: expected ')' before ';' token pStmt->setDouble(4, atof(strTradeAmount.c_str()); ^ PLCXProcess.cpp:3722:46: error: expected ')' before ';' token pStmt->setDouble(5, atof(strAgtFee.c_str()); ^ PLCXProcess.cpp: In member function 'int CPLCXProcess::insertcsdaily(oracle::occi::Connection*, XHX_PLCX_REPACKBODY*, bool, bool)': PLCXProcess.cpp:3893:51: error: expected ')' before ';' token pStmt->setDouble(4, atof(strTradeAmount.c_str()); ^ PLCXProcess.cpp:3894:46: error: expected ')' before ';' token pStmt->setDouble(5, atof(strAgtFee.c_str()); ^

这是一个编译错误，看起来是在PLCXProcess.cpp文件中的insertcsdaily函数中的setDouble方法中出现了语法错误。缺少一个右括号')'，可能是因为atof函数的调用缺少右括号。你可以检查一下PLCXProcess.cpp文件中这些行的代码，看看是否有语法错误，并且确保所有函数调用都有正确的参数列表。