addition

问题 I've been given an assingment to make a calculator in 8086 assembly that will add, substract, multiply and divide big decimal numbers. These numbers can be 30 digits long at most. I've used 3 arrays to house these numbers (num1, num2, result). I'm stuck at the addition, because every time I run the program, it displays that the result array is empty (it shows a plus sign and 60 zeroes) can you tell what is wrong with my code? ADDER: MOV BP, offset num1 MOV SI, offset num2 MOV DI, offset

问题 Simple question: If I have a string and I want to add to it head and tail strings (one in the beginning and the other at the end), what would be the best way to do it? Something like this: std::string tmpstr("some string here"); std::string head("head"); std::string tail("tail"); tmpstr = head + tmpstr + tail; Is there any better way to do it? Thanks in advance. 回答1: If you were concerned about efficiency and wanted to avoid the temporary copies made by the + operator, then you could do:

问题 This question already has answers here : How to add two java.lang.Numbers? (10 answers) Closed 5 years ago . i have used instance of . But is there any other way to add two generic values. Can it be done like this? public static<T extends Number> T add(T x, T y){ T sum; sum=x + y; return sum; } 回答1: You could do this to support integers and doubles(and floats), though I don't see real value in it public static<T extends Number> T add(T x, T y){ if (x == null || y == null) { return null; } if

问题 I have two pandas dataframes df1 (of length 2) and df2 (of length about 30 rows). Index values of df1 are always different and never occur in df2. I would like to add the average of columns from df1 to corresponding columns of df2 . Example: add 0.6 to all rows of c1 and 0.9 to all rows of c2 etc ... df1: Date c1 c2 c3 c4 c5 c6 ... c10 2017-09-10 0.5 0.6 1.2 0.7 1.3 1.8 ... 1.3 2017-09-11 0.7 1.2 1.3 0.4 0.7 0.4 ... 1.5 df2: Date c1 c2 c3 c4 c5 c6 ... c10 2017-09-12 0.9 0.1 1.4 0.9 1.5 1.9 ..

问题 Suppose x is a real number, or a vector. i is valued-False. Then x[i] will return numeric(0). I would like to treat this as a real number 0, or integer 0, which are both fit for addition. numeric(0) added to any real number will return numeric(0), whereas I wish to obtain the real number being added as the result. What can I do to convert the numeric (0) value? Thanks in advance! 回答1: It is only when we do the + , it is a problem. This can be avoided if we use sum sum(numeric(0), 5) #[1] 5

问题 This question already has answers here : How does this recursion work? (11 answers) Closed 4 days ago . So there is this recursion example in chap 3 of Eloquent JavaScript, it goes like this: Consider this puzzle: by starting from the number 1 and repeatedly either adding 5 or multiplying by 3, an infinite set of numbers can be produced. How would you write a function that, given a number, tries to find a sequence of such additions and multiplications that produces that number? And the given

问题 This question already has answers here : How does this recursion work? (11 answers) Closed 4 days ago . So there is this recursion example in chap 3 of Eloquent JavaScript, it goes like this: Consider this puzzle: by starting from the number 1 and repeatedly either adding 5 or multiplying by 3, an infinite set of numbers can be produced. How would you write a function that, given a number, tries to find a sequence of such additions and multiplications that produces that number? And the given

来源： https://stackoverflow.com/questions/24848062/why-is-this-simple-c-addition-6-times-slower-than-the-equivalent-java

来源： https://stackoverflow.com/questions/24848062/why-is-this-simple-c-addition-6-times-slower-than-the-equivalent-java

来源： https://stackoverflow.com/questions/55303847/numpy-pandas-optimized-vector-operations