Question

我是F＃的新手，但是当我使用详细语法时在另一个中放一个for循环，它不会编译：

#light "off"

let Multiple9x9 () = 
  for i in 1 .. 9 do
    printf "\n";
    for j in 1 .. 9 do
      let k = i * j;
      printf "%d x %d = %2d " i j k ;
    done;;
  done;;
Multiple9x9 ();;
printf "\n" ;;

我知道它适用于#light“on”：

let Multiple9x9 () = 
  for i in 1 .. 9 do
    printf "\n"
    for j in 1 .. 9 do
      let k = i * j
      printf "%d x %d = %2d " i j k
Multiple9x9 ()
printf "\n"

Answer 1

如果您要使用详细语法，则在每次in绑定后需要let。此外，在内循环中;;之后您不需要done：它会使外循环不完整（切断外部done）。

以下是更正后的代码：

let Multiple9x9 () = 
  for i in 1 .. 9 do
    printf "\n";
    for j in 1 .. 9 do
      let k = i * j in
      printf "%d x %d = %2d " i j k;
    done;
  done;;
Multiple9x9 ();;
printf "\n" ;;

使用详细语法在F＃嵌套for循环中编译错误

1 个答案: