Dart - 如何连接字符串和我的整数

Question

如何连接字符串和 int 行：

print('Computer is moving to ' + (i + 1));

和

print("Computer is moving to " + (i + 1));

我无法弄清楚，因为错误一直显示“参数类型‘int’无法分配给参数类型‘String’

void getComputerMove() {
    int move;

    // First see if there's a move O can make to win
    for (int i = 0; i < boardSize; i++) {
      if (_mBoard[i] != humanPlayer && _mBoard[i] != computerPlayer) {
        String curr = _mBoard[i];
        _mBoard[i] = computerPlayer;
        if (checkWinner() == 3) {
          print('Computer is moving to ' + (i + 1));
          return;
        } else
          _mBoard[i] = curr;
      }
    }

    // See if there's a move O can make to block X from winning
    for (int i = 0; i < boardSize; i++) {
      if (_mBoard[i] != humanPlayer && _mBoard[i] != computerPlayer) {
        String curr = _mBoard[i]; // Save the current number
        _mBoard[i] = humanPlayer;
        if (checkWinner() == 2) {
          _mBoard[i] = computerPlayer;
          print("Computer is moving to " + (i + 1));
          return;
        } else
          _mBoard[i] = curr;
      }
    }
  }

Answer 1

使用字符串插值：

print("Computer is moving to ${i + 1}"); 

或者直接调用 toString():

print("Computer is moving to " + (i + 1).toString()); 

Answer 2

您可以简单地使用

.toString

它将您的整数转换为字符串：

void main(){
     
    String str1 = 'Welcome to Matrix number ';
    int n = 24;
     
    //concatenate str1 and n
    String result = str1 + n.toString();
     
    print(result);
}

就你而言，它会是这样的：

print("Computer is moving to " + (i + 1).toString()); 

Answer 3

 var intValue = Random().nextInt(5)+1;   // 1 <--> 5
 var string = "the nb is $intValue random nb ";