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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

At this point, the study of "how to use atof function in C++" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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