logical-operators

#include <stdio.h> int main(void) { int i=10; if(i==(20||10)) printf("True"); else printf("False"); return 0; } This gives the output False . Please explain to me how does this program work? This line if(i==(20||10)) always evaluates to i==1 as Alk said in comments - (20||10) evaluates to 1 , hence when you compare i == 1 , that is why you get False as the output. A non-Zero value in C implies true. Read about Short-circuit evaluation Perhaps this is what you wanted: int i=10; if(i==20 || i == 10) printf("True"); else printf("False"); look at if(i==(20||10)) . Due to the inner parentheses, 20|

tl;dr: Is there a non-short circuit logical AND in C++ (similar to &&)? I've got 2 functions that I want to call, and use the return values to figure out the return value of a 3rd composite function. The issue is that I always want both functions to evaluate (as they output log information about the state of the system) IE: bool Func1(int x, int y){ if( x > y){ cout << "ERROR- X > Y" << endl; } } bool Func2(int z, int q){ if( q * 3 < z){ cout << "ERROR- Q < Z/3" << endl; } } bool Func3(int x, int y, int z, int q){ return ( Func1(x, y) && Func2(z, q) ); } Of course, the conditionals aren't

Possible Duplicate: R: subset() logical-and operator for chaining conditions should be & not && What is the difference between short ( & , | ) and long ( && , || ) forms of AND, OR logical operators in R? For example: x==0 & y==1 x==0 && y==1 x==0 | y==1 x==0 || y==1 I always use the short forms in my code. Does it have any handicaps? & and | - are element-wise and can be used with vector operations, whereas, || and && always generate single TRUE or FALSE theck the difference: > x <- 1:5 > y <- 5:1 > (x > 2) & (y < 3) [1] FALSE FALSE FALSE TRUE TRUE > (x > 2) && (y < 3) # here operaand &&

Everyone here should know the 'or' statemens, usually glued to an die() command: $foo = bar() or die('Error: bar function return false.'); The most of the times we see something like: mysql_query('SELECT ...') or die('Error in during the query'); However, i cant understand how exactly that 'or' statement works. I would like to throw a new exception instead of die(), but: try{ $foo = bar() or throw new Exception('We have a problem here'); Doesnt work, and neither $foo = bar() or function(){ throw new Exception('We have a problem here'); } The only way i found to do that is this horrible thought