title: Convert float value to NSString
body: <p>Do you know how can i convert float value to nsstring value because with my code, there is an error.</p>
  
  <p>My Code : </p>
  
  <pre><code>- (float)percent:(float)a :(float)b{
      return a / b * 100;
  }
  
  - (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects {
    // ....   
  
      float tx_nb_demande_portabilite = [self percent: [(NSNumber*) [stat nb_demande_portabilite] floatValue] :[(NSNumber*) [stat nb_users] floatValue]];
      NSString *tx_nb_demande_portabilite_st = [NSString stringWithFormat:@"%@", tx_nb_demande_portabilite];
  //....
  }
  </code></pre>
  
  <p>The error : </p>
  
  <pre><code>EXC_BAD ACCESS for NSString *tx_nb_demande_portabilite_st = [NSString stringWithFormat:@"%@", tx_nb_demande_portabilite];
  </code></pre>
  
  <p>Thank you for your help.</p>