What is atof function in CPP?

atof() function: This function converts a C-type string, passed as an argument to function call, to double. It parses the C-string str interpreting its content as a floating point number, which is returned as a value of type double. If no valid conversion can be performed, the function returns zero (0.0).

What library is atof in C++?

C library function – atof() The C library function double atof(const char *str) converts the string argument str to a floating-point number (type double).

What is Atoi and atof?

atof recognizes an optional string of tabs and spaces, then an optional sign, then a string of digits optionally containg a decimal point, then an optional e or E followed by an optionally signed integer. atoi recognizes an optional string of tabs and spaces, then an optional sign, then a string of digits.

How does the ATOF function work in C + +?

// working of atol () function. atof () function: This function converts a C-type string, passed as an argument to function call, to double. It parses the C-string str interpreting its content as a floating point number, which is returned as a value of type double.

What is the declaration of the ATOF ( ) function?

Following is the declaration for atof () function. str − This is the string having the representation of a floating-point number. This function returns the converted floating point number as a double value. If no valid conversion could be performed, it returns zero (0.0). The following example shows the usage of atof () function.

Which is a valid floating point argument for ATOF ( )?

In general, a valid floating point argument for atof () function has the following form: The atof () function ignores all the leading whitespace characters until the primary non-whitespace character is found.

When does ATOF stop reading the input string?

The function stops reading the input string at the first character that it cannot recognize as part of a number. This character may be the null character (‘\\0′ or L’\\0’) terminating the string. The str argument to atof and _wtof has the following form: