visual main.obj:错误LNK2019:C++中未解析的外部符号

Question

我知道这个特定的错误已经被提了十几次了。然而，在我的所有搜索中，我都未能找到与我的具体情况相关的解决方案。

我是一名从Java学习C++的大学生。我知道使用矢量而不是数组会更好。我也知道我可能理解错了，我希望你的解释能在这方面对我有所帮助。

好的，这是我的三个文件：

main.cpp

#include <iostream>
#include "Arrays.h"
// Global variables
const int ARRAY_SIZE = 4;
const int MIN_RANGE = 0;
const int MAX_RANGE = 100;
// Main function
int main()
{
    // Create two arrays populated with random numbers
    int* Array1 = createArray(ARRAY_SIZE, MIN_RANGE, MAX_RANGE); // One of these days I'll understand why ponters are so cool
    int* Array2 = createArray(ARRAY_SIZE, MIN_RANGE, MAX_RANGE); // Right now I find them a tad irritating
    // Create the third array
    int* Array3 = mergeArrays(Array1, Array2);
    // Print all arrays with the format "array1[1] + array2[1] = array3[1]"
    for (size_t i = 0; i < ARRAY_SIZE; i++)
    {
        std::cout << Array1[i] << " + " << Array2[i] << " = " << Array3[i] << std::endl << std::endl;
    }
    // Wait for input...
    system("pause");
    return 0;
}

Arrays.h

// Fucntion Prototypes
int* createArray(int arraySize, int minRange, int maxRange); // Creates an array populated with random numbers
int* mergeArrays(int* firstArray, int* secondArray); // Creates an array by adding the associated eements of two arrays
void printHeader(); // Prints the program's header

Arrays.cpp

#include <cstdlib>
#include <ctime>
#include "Arrays.h"
// Function to create an array with n random numbers between 0 and x
int* createArray(int arraySize, int minRange, int maxRange)
{
    srand(time(NULL)); // Generate seed for rand()
    int* Array = new int[arraySize]; // Create a pointer to a new array
    for (size_t i = 0; i < arraySize; i++) // Loop to assign values to each index in the array
    {
        // Generate a random number for each index in the array
        Array[i] = (rand() % maxRange) + minRange;
    }
    return Array;
}
// Function to create an array from two arrays with the associated values added together
int* mergeArrays(int* firstArray, int* secondArray, int arraySize)
{
    int* resultArray = new int[arraySize]; // Create a pointer to a new array
    for (size_t i = 0; i < arraySize; i++) // Loop to assign values to each index in the array
    {
        /* The value at each index in the array is equal to the sum of the values
        at the same index in the other two arrays*/
        resultArray[i] = firstArray[i] + secondArray[i];
    }
    return resultArray;
}

当我在Visual Studio 2013中构建它时，我得到的错误是：

1>main.obj : error LNK2019: unresolved external symbol "int * __cdecl mergeArrays(int *,int *)" (?mergeArrays@@YAPAHPAH0@Z) referenced in function _main
1>C:Assignment 2_1DebugAssignment 2_1.exe : fatal error LNK1120: 1 unresolved externals

Answer 1

声明和实现之间存在差异。

int* mergeArrays(int* firstArray, int* secondArray) //.h
int* mergeArrays(int* firstArray, int* secondArray, int arraySize) //.cpp

您的主函数使用了.h文件中的函数，但是，这个函数从未实现。在cpp文件中，您声明了一个具有相同名称但另一个签名（重载）的函数