我正试图将一个二维数组传递给numOfStudents函数，但Visual Studio给了我一个错误：
没有重载的"numOfStudents"实例与参数列表匹配
我试了所有的方法都找不到解决办法。
#include <stdio.h>
#include <cstring>
//Prototypes
int unsigned numOfStudents(char **namesArray, int *, FILE *);
void printArrays(char **namesArray, int *marksArray, int loopCounter);
int unsigned minMark(int);
int unsigned maxMark(int);
int unsigned averageMark(int);
//Two constants used later to create array of characters
const int MAX_SIZE = 10;
const int NAME_LENGTH = 30;
int main()
{
// Declaring array which will hold all names from file
char namesArray[MAX_SIZE][NAME_LENGTH];
int unsigned studentNumber = 0;
int loopCounter = 0;
int marksArray[MAX_SIZE]; //Array will hold the marks of students, it needs to be same size as the previous array
FILE *file; //creating pointer to a file
file = fopen("names.txt", "r"); //telling the pointer where the file is and how to access it
loopCounter = numOfStudents(namesArray, marksArray, file);
//System pause - will hold console window open
getchar();
return 0;
}
int unsigned numOfStudents(int *marksArray, char **namesArray, FILE *file)
{
char tempArrayName[50]; //Temporary array to hold names
char tempArrayLastName[50]; //Temporary array to hold last names
int i = 0; //Counter
bool stop = false;
if(file == NULL)
{
printf("nFile has been not opened correctlyn");
}
else
{
while (stop == false)
{
//Reading the file in order to get 3 separate lines which are assumed as a single record of one student
fscanf(file, "%sn%sn%d", tempArrayName, tempArrayLastName, &marksArray[i]);
//Following lines are compying strings from temp arrays into main array and adding a space for better readability
strcpy(namesArray[i], tempArrayName);
strcat(namesArray[i], " ");
strcat(namesArray[i], tempArrayLastName);
//Chcecking if the sentinel value was read in order to stop the loop
stop = strcmp(tempArrayName, "****");
i++; //adding the counter
//Checking if file is too big, before program will crash with an internal error
if (i == MAX_SIZE)
{
printf("ERROR!!! FILE TOO BIG TO READ!");
stop == true;
}
}
}
return i;
}
您使用以下参数列表声明numOfStudents:
int unsigned numOfStudents(char **namesArray, int *, FILE *);
但你用一个不同的参数列表来定义它：
int unsigned numOfStudents(int *marksArray, char **namesArray, FILE *file)
请注意，您的声明将char**作为第一个参数，但您的定义将其作为第二个参数(int*则相反(。参数的顺序非常重要，必须完全匹配，因此您需要更改定义以匹配声明：
int unsigned numOfStudents(char **namesArray, int *marksArray, FILE *file)
{
....
}
2D数组可能很难传递，为什么不使用std::string并传递其中的一个数组(或对std::vector的引用(呢？
int unsigned numOfStudents(char **namesArray, int *, FILE *); // declaration
int unsigned numOfStudents(int *marksArray, char **namesArray, FILE *file) // definition
检查每个中参数的顺序。定义的第二个参数实际上是声明的第一个参数。如果你纠正订单
，你应该很好您已经将函数numOfStudents的签名定义为：
int unsigned numOfStudents(char **namesArray, int *, FILE *);
并且您将函数声明为：
int unsigned numOfStudents(int *marksArray, char **namesArray, FILE *file)
{
---*** Your Code Here ***---
}
这就是函数签名和函数声明的"调用参数序列"应该与传递参数相同的问题。所以应该是这样的：
int unsigned numOfStudents(char **namesArray, int *marksArray, FILE *file)
{
---*** Your Code Here ***---
}