R multiple conditions in if statement

Read this thread R – boolean operators && and ||. Basically, the & is vectorized, i.e. it acts on each element of the comparison returning a logical array with the same dimension as the input. && is not, returning a single logical.

Multiple OR or AND conditions in IF statement

According to the C++ Standard 1 The && operator groups left-to-right. The operands are both contextually converted to bool (Clause 4). The result is true if both operands are true and false otherwise. Unlike &, && guarantees left-to-right evaluation: the second operand is not evaluated if the first operand is false. and 1 The || operator groups left-to-right. … Read more

Error: ‘else’ without ‘if’

Remove the semicolon at the end of this line: And please, please use curly brackets! Java is not like Python, where indenting the code creates a new block scope. Better to play it safe and always use curly brackets – at least until you get some more experience with the language and understand exactly when you can omit them.

break out of if and foreach

if is not a loop structure, so you cannot “break out of it”. You can, however, break out of the foreach by simply calling break. In your example it has the desired effect: Just for completeness for others that stumble upon this question looking for an answer.. break takes an optional argument, which defines how many loop structures it should break. Example: … Read more