Convert a character string to a numeric value.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <stdlib.h>

double atof(const char *nptr);

Parameters for this facility are:

nptr

const char *

The character being converted

The atof() function converts the character array pointed to by nptr to a floating point value of type double.

This function skips leading white space characters.

This function sets the global variable errno to ERANGE if the converted value cannot be expressed as a floating point value of type double.

atof() returns a floating point value of type double.

"atoi"

"atol"

"errno"

"scanf"

#include <stdlib.h>
#include <stdio.h>

int main(void)
{
	int i;
	long int j;
	float f;
	static char si[] = "-493", sli[] = "63870";
	static char sf[] = "1823.4034";

	f = atof(sf);
	i = atoi(si);
	j = atol(sli);

	printf("%f %d %ld\n", f, i, j);

	return 0;
}
Output:
1823.403400 -493 63870





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Last updated: August 16, 2000