NSDecimalNumber用法 加減乘除 解決字符串轉float類型不準確 結尾無法去0處理 用於貨幣處理

轉載聲明：NSDecimalNumber用法 加減乘除 解決字符串轉float類型不準確 結尾無法去0處理 用於貨幣處理





//貨幣算法 使用NSDecimalNumber 來進行精準計算

    //float  double  在計算時會產生誤差

     

    //加法

     

    //聲明兩個  NSDecimalNumber

    NSDecimalNumber*jiafa1 = [NSDecimalNumberdecimalNumberWithString:@"55.55555"];

     

    NSDecimalNumber*jiafa2 = [NSDecimalNumberdecimalNumberWithString:@"0.11111"];

     

     

    //加法運算函數  decimalNumberByAdding

    NSDecimalNumber*jiafa = [jiafa1 decimalNumberByAdding:jiafa2];

     

    NSLog(@"加法 %@", jiafa);

     

     

    //減法

     

    //聲明兩個  NSDecimalNumber

    NSDecimalNumber*jianfa1 = [NSDecimalNumberdecimalNumberWithString:@"55.55555"];

     

    NSDecimalNumber*jianfa2 = [NSDecimalNumberdecimalNumberWithString:@"0.11111"];

     

     

    //減法運算函數  decimalNumberByAdding

    NSDecimalNumber*jianfa = [jianfa1 decimalNumberBySubtracting:jianfa2];

     

    NSLog(@"減法 %@", jianfa);

     

     

    //乘法

     

    //聲明兩個  NSDecimalNumber

    NSDecimalNumber*chengfa1 = [NSDecimalNumberdecimalNumberWithString:@"55.55555"];

     

    NSDecimalNumber*chengfa2 = [NSDecimalNumberdecimalNumberWithString:@"0.11111"];

     

     

    //乘法運算函數  decimalNumberByAdding

    NSDecimalNumber*chengfa = [chengfa1 decimalNumberByMultiplyingBy:chengfa2];

     

    NSLog(@"乘法 %@", chengfa);

     

     

    //除法

     

    //聲明兩個  NSDecimalNumber

    NSDecimalNumber*chufa1 = [NSDecimalNumberdecimalNumberWithString:@"55"];

     

    NSDecimalNumber*chufa2 = [NSDecimalNumberdecimalNumberWithString:@"3"];

     

     

    //除法運算函數  decimalNumberByAdding

    NSDecimalNumber*chufa = [chufa1 decimalNumberByDividingBy:chufa2];