{{keywords>wiki library source code example reference}}
===== atof =====
<code c>
    #include <stdlib.h>
    double atof(const char *str);
</code>    
===== Description =====
<code c>
       The atof() function converts the initial portion of the string pointed to by
       nptr to double.  The behavior is the same as

           strtod(nptr, (char **) NULL);

       except that atof() does not detect errors.
</code>

===== C Sourcecode Example =====    
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <stdlib.h>

int main(void){

    char string[]="1234";
    float i;
    
printf("string = %s \n", string );
printf("int = %f \n", atof(string) );

i = atof(string);
i = i + i;
printf("i + i = %f\n", i);

return 0;
}

</code>

==== Output ====

    Output:
    user@host:~$ ./atof 
    string = 1234 
    int = 1234.000000 
    i + i = 2468.000000