哪种结构更适合这种情况,if-else或switch？

Question

哪种结构更适合这种情况,if-else或switch？

- (id)hexEvaluator:(double)remainder
{
    if(remainder == 0) {return [NSNumber numberWithInt:0];}
    else if(remainder == 1) {return [NSNumber numberWithInt:1];}
    else if(remainder == 2) {return [NSNumber numberWithInt:2];}
    else if(remainder == 3) {return [NSNumber numberWithInt:3];}
    else if(remainder == 4) {return [NSNumber numberWithInt:4];}
    else if(remainder == 5) {return [NSNumber numberWithInt:5];}
    else if(remainder == 6) {return [NSNumber numberWithInt:6];}
    else if(remainder == 7) {return [NSNumber numberWithInt:7];}
    else if(remainder == 8) {return [NSNumber numberWithInt:8];}
    else if(remainder == 9) {return [NSNumber numberWithInt:9];}
    else if(remainder == 10) {return @"A";}
    else if(remainder == 11) {return @"B";}
    else if(remainder == 12) {return @"C";}
    else if(remainder == 13) {return @"D";}
    else if(remainder == 14) {return @"E";}
    else if(remainder == 15) {return @"F";}
    else return nil;

    switch ((int)remainder) 
    {
        case 0:  return [NSNumber numberWithInt:0]; break;
        case 1:  return [NSNumber numberWithInt:1]; break;
        case 2:  return [NSNumber numberWithInt:2]; break;
        case 3:  return [NSNumber numberWithInt:3]; break;
        case 4:  return [NSNumber numberWithInt:4]; break;
        case 5:  return [NSNumber numberWithInt:5]; break;
        case 6:  return [NSNumber numberWithInt:6]; break;
        case 7:  return [NSNumber numberWithInt:7]; break;
        case 8:  return [NSNumber numberWithInt:8]; break;
        case 9:  return [NSNumber numberWithInt:9]; break;
        case 10: return @"A";; break;
        case 11: return @"B";; break;
        case 12: return @"C";; break;
        case 13: return @"D";; break;
        case 14: return @"E";; break;
        case 15: return @"F";; break;

        default: return nil; break;
    }
}

另外,在旁注:为什么切换表达式(在我的情况下为余数)不允许是'double'类型？我不得不把它转换成'int'来编译它.

Answer 1

绝对是一个if语句.我会摆脱所有额外的线条:

- (id)hexEvaluator:(double)remainder
{
    if (remainder < 10)
    {
        return [NSNumber numberWithInt:(int)remainder];
    }
    else if (remainder < 16)
    {
        return [NSString stringWithFormat:@"%X", (int)remainder)];
    }
    return nil;
}