声明两个 NSDecimalNumber
NSDecimalNumber *num1 = [NSDecimalNumber decimalNumberWithString:@"3.1415926"];
NSDecimalNumber *num2 = [NSDecimalNumber decimalNumberWithString:@"0.125"];
// 加法 运算函数 decimalNumberByAdding
NSDecimalNumber *jiafa = [num1 decimalNumberByAdding:num2];
NSLog(@"加法 %@", jiafa);
// 减法运算函数 decimalNumberByAdding
NSDecimalNumber *jianfa = [num1 decimalNumberBySubtracting:num2];
NSLog(@"减法 %@", jianfa);
// 乘法运算函数 decimalNumberByAdding
NSDecimalNumber *chengfa = [num1 decimalNumberByMultiplyingBy:num2];
NSLog(@"乘法 %@", chengfa);
// 除法运算函数 decimalNumberByAdding
NSDecimalNumber *chufa = [num1 decimalNumberByDividingBy:num2];
NSLog(@"除法 %@", chufa);
