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

Use atof()

But this is deprecated, use this instead:

const char* flt = "4.0800";
float f;
sscanf(flt, "%f", &f);

http://www.cplusplus.com/reference/clibrary/cstdlib/atof/

atof() returns 0 for both failure and on conversion of 0.0, best to not use it.