运算符＜参数类型未定义 boolean, int [英] The operator < is undefined for the argument type(s) boolean, int

问题描述

我是处理新手，遇到了这个问题.我不断收到以下代码粗体部分的错误消息.我的语法错了吗?

I am new to processing and I am having trouble with this. I keep getting an error message for the bolded part of the code below. Is my syntax wrong?

void block(int x, int y, int s, color tinto) {
    fill(tinto);
    for (int i = 0; i < 3; i++) {
        triple(x, y+i*s, s, tinto);
    }
    if (0 < i < 3 && 6 < i < 9) {  // HERE
        tinto = 255;
    }
    else {
        tinto = tinto - 200;
    }
}

推荐答案

语法无效，我认为你的表达无论如何都是错误的.你说 i 必须在一个范围内并且在另一个范围内.我想你的意思是说它可能介于两者之间.

The syntax is not valid, and I think you're expression is wrong anyway. You say i has to be within a range AND within another. I think you mean to write that it could be between one OR the other.

有效语法示例:代替 0 <我＜3，写i>0 &&我＜3.

Example of valid syntax: instead of 0 < i < 3, write i > 0 && i < 3.

试试这个:

if ( (i > 0 && i < 3) || (i > 6 && i < 9) )

请注意，以下(显然是您尝试执行的操作)永远不会被评估为 true，因为它不能在两个范围内.

Note that the following (which is what you were trying to do apparently) will never be evaluated to true because it cannot be within both ranges.

if ( (i > 0 && i < 3) && (i > 6 && i < 9) ) // incorrect

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