How to convert string to float?

Question

#include
#include

int main() 
{
    char s[100] =\"4.0800\" ; 

    printf(\"float value : %4.8f\\n\" ,(float) atoll(s)); 
    return         


        

Answer 1

double x;

char *s;

s = " -2309.12E-15";

x = atof(s);     /* x = -2309.12E-15 */

printf("x = %4.4f\n",x);