当我已经声明的变量时未声明的标识符错误 [英] undeclared identifier error occurs when I already have declared the variable

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本文介绍了当我已经声明的变量时未声明的标识符错误的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我从后续code未声明的标识符错误,但我已经明确宣布在这两种情况下变长。我做了什么错了?

  INT startWordLenRec(char中[]){
    如果(isLetter(S)== FALSE){
    INT长度= 0;
    }
    否则,如果{
    INT长度= 1 + startWordLenRec(S + 1);
    }
    返回的长度;
}


解决方案

一个声明是本地声明它的范围。所以,如果你把它声明里面 {} ,它不能闭幕后使用}

  INT startWordLenRec(char中[]){
    INT长;
    如果(isLetter(S)== FALSE){
        长度= 0;
    }
    否则,如果{
        长度= 1 + startWordLenRec(S + 1);
    }
    返回的长度;
}

当然,你也可以在 0的回报。直接,没有一个单独的变量

I got an undeclared identifier error from the follow code, but i have clearly declared the variable "length" in both cases. what did I do wrong?

int startWordLenRec(char s[]) {
    if (isLetter(s) == false){
    	int length = 0;
    }
    else if{
    	int length = 1 + startWordLenRec(s+1);
    }
    return length;
}

解决方案

A declaration is local to the scope you declare it in. So if you declare it inside {}, it cannot be used after the closing }.

int startWordLenRec(char s[]) {
    int length;
    if (isLetter(s) == false){
        length = 0;
    }
    else if{
        length = 1 + startWordLenRec(s+1);
    }
    return length;
}

Of course, you can also return 0; directly, without a separate variable.

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