c: string to float (only with Libc)? [duplicate]

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string to float conversion?

how can i convert a string to float in c with only Libc?

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You can use strtod or sscanf to do this.

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char *float_str = "10.5";
double d = atof(float_str);

or

char *float_str = "10.5";
double d = strtod(float_str, (char **) NULL);

(The second form is recommended for newer code, as atof is deprecated in favor of strtod.)

It's in the stdlib.h header.

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http://www.gnu.org/software/libc/manual/html_mono/libc.html#Parsing-of-Floats

particularly strtod, strtof

correct link...