class D { public static void main(String args[]) { Integer b2=128; Integer b3=128; System.out.println(b2==b3); } } Output: false class D { public static void main(String args[]) { Integer b2=127; Integer b3=127; System.out.println(b2==b3); } } Output: true Note: Numbers between -128 and 127 are true. 8 Answers 8
I understand that if I pass a value-type (int, struct, etc.) as a parameter (without the ref keyword), a copy of that variable is passed to the method, but if I use the ref keyword a reference to that variable is passed, not a new one. But with reference-types, like classes, even without the ref … Read more
Is it better in C++ to pass by value or pass by constant reference? I am wondering which is better practice. I realize that pass by constant reference should provide for better performance in the program because you are not making a copy of the variable. 11 Answers 11
If C does not support passing a variable by reference, why does this work? #include <stdio.h> void f(int *j) { (*j)++; } int main() { int i = 20; int *p = &i; f(p); printf(“i = %d\n”, i); return 0; } Output: $ gcc -std=c99 test.c $ a.exe i = 21 19 Answers 19
What are the benefits of passing by pointer over passing by reference in C++? Lately, I have seen a number of examples that chose passing function arguments by pointers instead of passing by reference. Are there benefits to doing this? Example: func(SPRITE *x); with a call of func(&mySprite); vs. func(SPRITE &x); with a call of … Read more
I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++. Do I need to pass pointers, references, or non-pointer and non-reference values? I remember in Java there are no such issues since we pass just the variable that holds reference to … Read more
@user.update_languages(params[:language][:language1], params[:language][:language2], params[:language][:language3]) lang_errors = @user.errors logger.debug “——————–LANG_ERRORS———-101————-” + lang_errors.full_messages.inspect if params[:user] @user.state = params[:user][:state] success = success & @user.save end logger.debug “——————–LANG_ERRORS————-102———-” + lang_errors.full_messages.inspect if lang_errors.full_messages.empty? @user object adds errors to the lang_errors variable in the update_lanugages method. when I perform a save on the @user object I lose the errors that were initially … Read more
I’m trying to do do the following: GetString( inputString, ref Client.WorkPhone) private void GetString(string inValue, ref string outValue) { if (!string.IsNullOrEmpty(inValue)) { outValue = inValue; } } This is giving me a compile error. I think its pretty clear what I’m trying to achieve. Basically I want GetString to copy the contents of an input … Read more
Are PHP variables passed by value or by reference? 16 Answers 16
1) When an array is passed as an argument to a method or function, is it passed by reference, or by value? 2) When assigning an array to a variable, is the new variable a reference to the original array, or is it new copy? What about doing this: $a = array(1,2,3); $b = $a; … Read more
