Go-为什么我的For Loop会抛出“意外的分号或换行符”？

Question

I'm writing a dice rolling function. In order to add the result of each die, I added to an output variable using a for loop. However, I'm getting an error thrown when I attempt to build;

syntax error: unexpected semicolon or newline, expecting {

This was thrown on the line initializing the for loop. Here is my code:

    for i := 0; i < [0]si; i++ {
        output := output + mt.Intn([1]si)
    }

si is simply an int array holding 2 values, and mt is the name I gave to math/rand when I imported it.

Answer 1

Your loop has several problems:

1. The use of square brackets is odd. Outside of type definitions, these go after slice/array names, e.g. x[i] would give you the ith element of the slice x.
2. There is no reference to i inside the loop body, and thus each iteration of the loop will do the same thing.
3. You should probably write output = output + ... without the colon. Otherwise, a new variable output is declared during each iteration of the loop, and forgotten immediately after so that the loop has no effect.

The compiler error is probably caused by the first of these problems.