arithmetic expressions

• How does `int sum = n + - + - + - + n` compile where `n` is an `int`?2018-12-15

This afternoon, I really don't know what I was doing with Operators and C. Eventually, I wrote some code which I was thinking wouldn't compile, But I don't know how it worked. The code is: #include <stdio.h> int main() { int n=2; int sum = n + - + -

• Detecting number patterns in an array2014-02-27

I'm trying to work through the following exercise. There is a problem with my code but I don't understand what it is... Using the JavaScript language, have the function ArithGeo(arr) take the array of numbers stored in arr and return the string "Arit

• BASH Arithmetic Issues2012-04-10

I'm working in BASH and I'm having an idiot moment right now. I've got a project I'm working on that I'm going to need to use some very basic arithmetic expressions and I just realized that a lot of my problems with it are because my variables are no

• Incrementing an integer in xslt2012-04-08

There is a question with a similar title, but an entirely different question body: How to increment a XSL integer variable I get a parameter \$level passed to a template and want to apply templates on \$level + 1, while \$level is guaranteed to always b

• Android - calculating and storing the answer of an arithmetic expression2012-02-27

What would be best way to get the answer to this question which is using random numbers and random operators. editTextEquation.setText(random1 +(String.valueOf(ops[i1]) + random2 + (String.valueOf(ops[i2])+ random3 + (String.valueOf(ops[i3])+ random4

• How to do arithmetic expression evaluation in prolog?2012-02-09

I am trying to solve an arithmetic expression in prolog (implementation - eclipse prolog). The arithmetic expression to be solved is like this: A * (C + B * X) + D * X = E X is the value to be computed, and all others (A,B,C,D,E) are all numbers. For

• combining two variables to set a new variable to an already declared variable using javascript2012-01-19

I am trying to set a new variable to the same value as an already declared variable by combining two variables that together make the name of the original variable... This may sound confusing, so here's an example: // JavaScript Document document.wri

• Arithmetic operations on y(x) functions in R2012-01-17

Suppose we have data frame f with two columns x and y where all values in f\$x go in ascending order. We can treat it as a function y(x). I want to perform arithmetic operations on such data frames like on functions in mathematical sense. For example:

• Why awk arithmetic doesn't work?2011-12-07

I have simple script: #!/bin/sh #NOTE - this script does not work! #column=\${1:-1} column=1+1 awk '{print \$'\$column'}' But when run ls -la | ~/test/Column.sh I receive always 1 1 1 1 What the problem? --------------Solutions------------- Your script

• Problems to use "Mul" and "Mod" operators in Bash2011-12-01

I don't understand why in this code echo "Please, give me two numbers:" echo 1: read a echo 2: read b echo "a = \$a" echo "b = \$b" OPT="Sum Sub Div Mul Mod" select opt in \$OPT; do if [ \$opt = "Sum" ]; then sum=\$(echo \$a + \$b | bc -l) echo "SUM is: \$su

• What should this code print? It it compiler dependent? 2011-11-24

Possible Duplicate: Undefined Behavior and Sequence Points What does this this code print and why? Is it compiler dependent? int t=0; std::cout << t++ + ++t - t-- << std::endl; --------------Solutions------------- Undefined behavior. A co

• Execute an arithmetic expression in Android2011-11-16

I want to do an arithmetic operation on data stored in an Array. User may choose random column and random operation on them. like, String DataTmp[10][3] = ...; String strCalc = "Float.parseFloat(DataTmp[i][0]) + Float.parseFloat(DataTmp[i][2]) * Floa

• Is there such a thing as short circuit multiplication?2011-11-16

We all know about short circuiting in logical expressions, i.e. when if ( False AND myFunc(a) ) then ... doesn't bother executing myFunc() because there's no way the if condition can be true. I was curious as to whether there is an equivalent for you

• Firefox JavaScript arithmetics performance oddity2011-10-12

Please run this test on firefox. http://jsperf.com/static-arithmetic How would you explain the results? This b = a + 5*5; b = a + 6/2; b = a + 7+1; executes much faster than b = a + 25; b = a + 3; b = a + 8; Why? --------------Solutions-------------

• How do I add two integers together with Twisted?2011-09-06

I have two integers in my program; let's call them "a" and "b". I would like to add them together and get another integer as a result. These are regular Python int objects. I'm wondering; how do I add them together with Twisted? Is there a special pe

• Is \$(( expr )) equivalent to \$[ expr ] in bash? 2011-08-14

Possible Duplicate: bash: \$[<arithmetic-expression>] vs. \$((<arithmetic-expression>)) The \$(( expr )) construct can be used for integer math in bash, e.g. echo \$(( 2*2 + 1 )) # 5 \$[ expr ] seems to do to do the same (but isn't documented)

• How do promotion rules work when the signedness on either side of a binary operator differ?2011-07-21

Consider the following programs: // http://ideone.com/4I0dT #include <limits> #include <iostream> int main() { int max = std::numeric_limits<int>::max(); unsigned int one = 1; unsigned int result = max + one; std::cout << resu

• Validate expression/infix in python2011-07-19

How do I validate an expression/infix in python? Is it possible? For example: a-d*9 5-(a*0.3-d+(0.4-e))/k*5 (a-d*9)/(k-y-4.3*e)+(t-7*c) --------------Solutions------------- If you want Python-style expressions, you can use the parser in the ast modul

• Can a function be used in \$(( func arg ? str1 : str2 ))?2011-06-08

I'd like to use a statement like this: var=\$(( func arg ? str1 : str2 )) but bash gives this syntax error message: syntax error in expression (error token is "arg") I've played with various forms but I can't figure out how to make it accept a functio

• MATLAB: Is it possible to overload operators on native constructs (cells, structs, etc)?2011-03-19

I'm using cells to manage data in some stuff I'm working on. I'd like to be able to do things like: A = cellfun( @(X)( randn( 5,5 ) ), cell( 5,1 ), 'UniformOutput', 0 ); B = cellfun( @(X)( randn( 5,5 ) ), cell( 5,1 ), 'UniformOutput', 0 ); %# %# Each