使用了未初始化的局部变量“j"

问题描述

这是我拥有的一些代码的一部分.我收到错误未初始化的局部变量j"，但我没有看到.据我所知，它正在被使用.有人可以帮忙吗?

Here is a section of some code I have. Im getting an error uninitialized local variable 'j' used and I dont see it. as far as I can tell it is being used. Can someone please help?

float Calculate(Element ElmAry[30], Formula FormAry[30])
{
    int i;
    int j;
    float MoleWT = 0;
    float MoleSum = 0;
    char e1;
    char e2;
    char f1;
    char f2;

    for(i = 0; i < 30; i++) {

        f1 = FormAry[j].Element1;
        f2 = FormAry[j].ElementA;
        e1 = ElmAry[i].eN1;
        e2 = ElmAry[i].eN1;

        if(e1 == f1 && e2 == f2) {
            MoleWT = ElmAry[i].Weight * FormAry[j].Atom;
            MoleSum = MoleSum + MoleWT;
            j++;
        }
    }

return MoleSum;
}

推荐答案

所以你在行中首先使用变量 j

So you use the variable j first in the line

f1 = FormAry[j].Element1;

但是您之前没有为 j 分配任何值，因此未初始化".之前提到的 j 是在你的声明中:

But you haven't assigned any value to j previously, hence "uninitialized". The previous mention of j was in your declaration:

int j;

你需要给它赋值，比如 0:

You need to assign a value to it, like 0:

int j = 0;

这就是所谓的初始化"，因为如果你不给一个变量赋值，你应该从那个变量中得到什么值?

That is call "initialization", because if you don't assign any value to a variable, what value should you expect from that variable?

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