Convert float value to NSString

Question

Do you know how can i convert float value to nsstring value because with my code, there is an error.

My 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];
//....
}

The error :

EXC_BAD ACCESS for NSString *tx_nb_demande_portabilite_st = [NSString stringWithFormat:@"%@", tx_nb_demande_portabilite];

Thank you for your help.

Answer 1

You need to use %f format specifier for float, not %@.

NSString *str = [NSString stringWithFormat:@"%f", myFloat];

To use specific number of digits after decimal use %.nf where n is number of digits after decimal point.

// 3 digits after decimal point
NSString *str = [NSString stringWithFormat:@"%.3f", myFloat];

Obj-C uses C printf style formatting. Please check printf man page for all other possible formatting.