How to use the atof function in C++
This article mainly introduces "how to use the atof function in C++". In daily operation, I believe many people have doubts about how to use the atof function in C++. Xiaobian consulted all kinds of information and sorted out simple and easy to use operation methods. I hope to help you answer the doubts about "how to use the atof function in C++"! Next, please follow the small series to learn together!
1.atof function
The atof function in stdlib.h can be used to convert char strings to float / double floating point numbers,
The syntax is as follows:
/** Description: Convert a char type to a floating-point number double** Parameters: * [in]str： String type ** Return value: Return floating point number corresponding to char type double*/double atof ( const char * str ); II.atof function actual combat #include "stdafx.h"#include #include "windows.h"#pragma warning(disable: 4996)int _tmain(int argc, _TCHAR* argv[]){ printf("atof function results %f \n", atof("13456")); printf("atof function results %f \n", atof("0")); printf("atof function results %f \n", atof("789")); printf(" %f \n", atof("123.123")); printf("atof function results %f \n", atof("-9")); system("pause"); return 0;}
Output:
atof function calculation result 13456.000000
atof function calculation result 0.000000
atof function calculation result 789.000000
atof function calculation result 123.123000
atof function calculation results-9.000000
Press any key to continue. . .
Note the use of placeholders:
Floating point is using %f
integer is using %d
char character is %c used
char string is using %s
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