atof - convert a string
to a float
atof - convert a string to a double
#include <stdlib.h>
float atof(string s);
#include <stdlib.h>
double atof(const char *nptr);
This function converts a (positive or negative) floating-point value from a string
(e.g., "50.0"
) to a float
(e.g., 50.0
).
This function returns its input, s
, as a float
.
The converted value.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
printf("This is CS%.0f\n", atof("50.0"));
}
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
atof() | Thread safety | MT-Safe locale |
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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