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C Language: atof function(Convert String to Floating-Point)

In the C Programming Language, the atof function converts a string to a floating-point number (double).

The atof function skips all white-space characters at the beginning of the string, converts the subsequent characters as part of the number, and then stops when it encounters the first character that isn't a number.

Syntax

The syntax for the atof function in the C Language is:

double atof(const char *nptr); Parameters or Arguments nptr A pointer to a string to convert to a floating-point number (double). Returns

The atof function returns the floating-point representation of a string. The atof function skips all white-space characters at the beginning of the string, converts the subsequent characters as part of the number, and then stops when it encounters the first character that isn't a number.

Required Header

In the C Language, the required header for the atof function is:

#include Applies To

In the C Language, the atof function can be used in the following versions:

ANSI/ISO 9899-1990 Similar Functions

Other C functions that are similar to the atof function:

atoi function atol function strtod function See Also

Other C functions that are noteworthy when dealing with the atof function:

strtol function strtoul function