title: Converting string, to float (without atof) in C
body: <p>I'm designing a function that will convert a string into a float. 
  e.g. "45.5" = 45.5</p>
  
  <p>I have this so far. But it doesn't seem to work. Keep in mind, we cannot use any C library functions like atoi, atof or even pow for that matter.</p>
  
  <pre><code>int str2float( char *s )
  {
      int num = 0;
      int dec = 0;
      double i = 1.0;
      int ten = 1;
      /***** ADD YOUR CODE HERE *****/
  
      for(; *s != '\0'; s++)
      {
          if (*s == '.'){
              for(; *s != '\0'; s++){
                  dec = (dec * CONT) + (*s - '0');
                  i++;
              }
          }else{
              num = (num * CONT) + (*s - '0');
          }
  
      }
      for(;i!=0;i--){
          ten *= 10;
      }
      dec = dec / (ten);
      printf("%d", dec);
      num += dec;
      return num;  
  }
  </code></pre>