declare

Take, for example, the following code: #include <iostream> #include <string> int main() { print("Hello!"); } void print(std::string s) { std::cout << s << std::endl; } When trying to build this, I get the following: program.cpp: In function ‘int main()’: program.cpp:6:16: error: ‘print’ was not declared in this scope Which makes sense. So why can I conduct a similar concept in a struct, but not get yelled at for it? struct Snake { ... Snake() { ... addBlock(Block(...)); } void addBlock(Block block) { ... } void update() { ... } } snake1; Not only do I not get warnings, but the program actually

I am learning C and I am studying functions. So, I read that when I implement my own function I have to declare it before the main(). If I miss the declaration the compiler will get an error message. As I was studying this example (finds if the number is a prime number) #include <stdio.h> void prime(); //function prototype(declaration) int main() { int num,i,flag; num = input(); // No argument is passed to input() for(i=2,flag=i; i<=num/2; ++i,flag=i) { flag = i; if(num%i==0) { printf("%d is not prime\n",num); ++flag; break; } } if(flag==i) printf("%d is prime\n",num); return 0; } int input()

I am trying to define and initialize a MySQL variable for a query. I have the following: declare @countTotal int; SET @countTotal = select COUNT(*) from nGrams; I am using MySQL in Netbeans and it tells me I have an error. What/where is my error? How can I fix this? MySQL has two different types of variable: local variables (which are not prefixed by @ ) are strongly typed and scoped to the stored program block in which they are declared. Note that, as documented under DECLARE Syntax : DECLARE is permitted only inside a BEGIN ... END compound statement and must be at its start, before any

When typing variables in Bash, what is the difference between declare and typeset ? When used inside a function: what is the difference between declare and typeset and local ? The only difference I have come across is that typeset is portable to ksh scripts. Other than that, are there any reasons why one should be preferred over the other? UPDATE: Added local to the question. Difference between typeset and declare : The former is more portable(e.g. ksh), while the latter is more preferable when portability is not a concern. Difference between declare (or typeset ) and local when used inside a

I found serval node.js projects that have this at top of their app.js (as in this openshift program ): #!/bin/env node What does this mean? How does this work? Where is it useful? The full line from your example is: #!/bin/env node This simply means that the script should be executed with the first executable named 'node' that's found in your current PATH. The shebang (#!) at the start means execute the script with what follows. /bin/env is a standard unix program that looks at your current environment. Any argument to it not in a 'name=value' format is a command to execute. See your env