learngo/02-write-your-first-program/questions/03-run-your-first-program/README.md

What is the difference between go build and go run?

1. go run just compiles a program; whereas go build both compiles and runs it.
2. go run both compiles and runs a program; whereas go build just compiles it. CORRECT

1: It's opposite actually.

2: go run compiles your program and puts it in a temporary directory. Then it runs the compiled program in there.

Go saves the compiled code in a directory. What is the name of that directory?

1. The same directory where you call go build CORRECT
2. $GOPATH/src directory
3. $GOPATH/pkg directory
4. Into a temporary directory.

2: There only lives Go source-code files

3: Go only puts your code there when you call go install.

Which is true for runtime?

1. It happens when your program starts running on a computer CORRECT
2. It happens while your program is being compiled

Which is true for the compile-time?

1. It happens when your program starts running on a computer
2. It happens while your program is being compiled CORRECT

When can a Go program print a message to the console?

1. While it's being compiled.
2. While it runs (after compile-time). CORRECT
3. While it runs (inside the compile-time).

1: In the compilation step your program cannot print a message. In that stage, it's literally dead.

2: That's right. That's the only time which your program can interact with a computer and instruct it to print a message to the console.

3: Running can only happen after the compile-time