C4700：未初始化的局部变量 [英] C4700: uninitialized local variable

问题描述

当我编译这个代码，它说我不知道我现在要做什么来解决这个问题。我不是一个IT学生或技术人员，但我非常喜欢学习C ++，我自己学习。我一直在这1天。

When I compile this code it says "error C4700: uninitialized local variable 'b' used". I'm not sure what I have to do now to fix this problem. I'm neither an IT student or technican but I very like to learn C++ and I'm learning it by myself. I've been on this for 1 day.

非常感谢

#include <stdio.h>
#include <iostream>

//A. 
//1--
void InputArray(int *a, int &n)
{
    printf("Insert n = ");
    scanf("%d", &n);
    a = new int[n];
    for (int i=0; i<n; i++)
    {
        printf("Enter the key's a[%d] values: ", i);
        scanf("%d",&a[i]);
    }
}


void main()
{
    int *b, m;
    InputArray(b, m);
}

推荐答案

b 是通过值传递的，这意味着将进行一个副本，但由于它没有初始化，你会收到警告。只需初始化它：

b is passed by value, which means a copy will be made, but since it's not initialized, you get the warning. Simply initialize it:

int *b = nullptr;

或

int *b = NULL;

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