我一直在网上试图解决我的构建错误。我很确定一旦我解决了这些问题，我的程序就会运行，但由于我已经能够编译我的代码，因此很难进行测试。
任何建议都会受到赞赏，是的，这是作业。我是C的新手，我知道我可能犯了愚蠢的错误。我将把所有回复作为学习机会。代码如下。发布错误后。
// Program will take user input for student names and provide functions in
// order to sort by first name, by last name
// by score and a menu function.
#include <stdio.h>
#include <string.h>
// Prototypes for functions
int menu();
void searchLast(char [][21], char [][21],float [], int);
void searchFirst(char [][21], char [][21],float [], int);
void sortLast(char [][21], char [][21],float [], int);
void sortScore(char [][21], char [][21],float [], int);
void printRecords(char [][21], char [][21],float [], int);
int main()
{
int j,NumOfRecords, k = 0;
char FirstN[15][21],LastN[15][21];
float Score[15];
int select = 0;
// Asking for the number of records the students to add
printf("How many records would you like to enter, minimum of 5, max of 15? "); G
scanf("%d",&NumOfRecords);
for( k = 0; k < NumOfRecords; k++) // Loop to take user input and save in appropriate
// array location
{
for(j=0;j<21;j++)
{
scanf("First name: %s", &FirstN[k][j]);
scanf(" Last Name: %s", &LastN[k][j]);
scanf(" Score: %f", &Score[k]);
printf("\n");
}
}
select = menu(); // Calling menu function to assign selection to call the next function
printf("%d",select); // checking to see that selection was passed to 'select'
while (select != 0) // Sentinel loop to provide user with options to modify array output
{
if (select == 1) // prints all records
{
printRecords(FirstN,LastN,Score,NumOfRecords);
}
if (select == 2) //Searches for First name and prints associated records
{
searchFirst(FirstN,LastN,Score,NumOfRecords);
}
if (select == 3) // Searches for last name and prints associated records
{
searchLast(FirstN,LastN,Score,NumOfRecords);
}
if (select == 4) // Sorts records by score and prints associated records
{
sortScore(FirstN,LastN,Score,NumOfRecords);
}
if (select == 5) // Sorts by last name and prints associated records
{
sortLast(FirstN,LastN,Score,NumOfRecords);
}
if (select == 0) // Exits program
break;
select = menu();
}
return 0;
}
int menu() // The menu function
{
int num;
printf("Menu Options \n \n");
printf("Print Records (press 1) \n");
printf("Search by first name (press 2) \n");
printf("Search by last name (press 3) \n");
printf("Sort by score (press 4) \n");
printf("Sort by last name (press 5) \n");
printf("Exit the program (press 0) \n");
printf("Please enter option number: ");
scanf("%d", num); // Takes the selection to be passed out of the function
return num; // Returns the selection to main
}
void searchLast(char FirstName[][21],char LastName[][21], float Scores[],int NumOfRecords)
{
int j;
char Lname[1][21];
printf("Please enter last name to search for");
for (j=0;j<20;j++)
{
scanf("%s",Lname[0][j]);
}
for(j=0;j<NumOfRecords;j++)
{
if(Lname[0] == LastName[j])
{
printf("%s %s %f",FirstName[j],LastName[j],Scores[j]);
}
}
}
void searchFirst(char FirstName[][21],char LastName[][21], float Scores[],int NumOfRecords)
{
int j;
char Fname[1][21];
printf("Please enter last name to search for");
for (j=0;j<20;j++)
{
scanf("%s",Fname[0][j]);
}
for(j=0;j<NumOfRecords;j++)
{
if(Fname[0] == FirstName[j])
{
printf("%s %s %f",FirstName[j],LastName[j],Scores[j]);
}
}
}
void sortLast(char FirstName[][21],char LastName[][21], float Scores[],int NumOfRecords)
{
int j,x = 0;
int k;
for(j = 0; LastName[j] < LastName[j+1] ; j++)
{
for(k = (j+1) ; k < NumOfRecords; k++)
if (LastName[j] < LastName[k])
{
float temp = 0; // function attempts to sort Arrays saving string
char tempFirst; // values in a veriable to then be reassigned to
char tempLast; // appropriate Array index.
temp = Scores[j];
Scores[j] = Scores[k];
Scores[k] = temp;
tempLast = LastName[j];
LastName[j] = LastName[k];
LastName[k] = tempLast;
tempFirst = FirstName[j]
FirstName[j] = FirstName[k];
FirstName[k] = tempFirst;
}
void sortScore(char FirstName[15][21],char LastName[15][21], float Scores[],int NumOfRecords)
{
int j,x = 0;
int k;
for(j = 0; Scores[j] < Scores[j+1] ; j++)
{
for(k = (j+1) ; k < NumOfRecords; k++)
if (Scores[j] < Scores[k])
{
float temp = 0;
char tempFirst;
char tempLast;
temp = Scores[j];
Scores[j] = Scores[k];
Scores[k] = temp;
tempLast = LastName[j];
LastName[j] = LastName[k];
LastName[k] = tempLast;
tempFirst = FirstName[j]
FirstName[j] = FirstName[k];
FirstName[k] = tempFirst;
}
}
printRecords(FirstName,LastName,Scores,NumOfRecords);
}
void printRecords(char FirstName[][21],char LastName[][21], float Scores[],int NumOfRecords)
{
int j = 0;
for (j = 0; j < NumOfRecords ; j++)
{
printf("%s %s %f \n",FirstName[j],LastName[j],Scores[j]);
}
}
//错误：
1>c:\[....]\meg4545.c(139): warning C4047: '=' : 'char' differs in levels of indirection from 'char *'
1>c:\[....]\meg4545.c(140): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(141): warning C4047: '=' : 'char [21]' differs in levels of indirection from 'char'
1>c:\[....]\meg4545.c(141): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(143): warning C4047: '=' : 'char' differs in levels of indirection from 'char *'
1>c:\[....]\meg4545.c(143): error C2146: syntax error : missing ';' before identifier 'FirstName'
1>c:\[....]\meg4545.c(143): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(144): warning C4047: '=' : 'char [21]' differs in levels of indirection from 'char'
1>c:\[....]\meg4545.c(144): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(146): error C2143: syntax error : missing ';' before 'type'
1>c:\[....]\meg4545.c(150): error C2143: syntax error : missing ';' before 'type'
1>c:\[....]\meg4545.c(162): warning C4047: '=' : 'char' differs in levels of indirection from 'char *'
1>c:\[....]\meg4545.c(163): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(164): warning C4047: '=' : 'char [21]' differs in levels of indirection from 'char'
1>c:\[....]\meg4545.c(164): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(166): warning C4047: '=' : 'char' differs in levels of indirection from 'char *'
1>c:\[....]\meg4545.c(166): error C2146: syntax error : missing ';' before identifier 'FirstName'
1>c:\[....]\meg4545.c(166): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(167): warning C4047: '=' : 'char [21]' differs in levels of indirection from 'char'
1>c:\[....]\meg4545.c(167): error C2106: '=' : left operand must be l-value
1>c:\[....]\meg4545.c(174): error C2143: syntax error : missing ';' before 'type'
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:02.31
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
答案 0 :(得分：1)
可能有很多问题：
这里有一组char数组（LastName[][21]）：
void searchLast(char FirstName[][21],char LastName[][21], float Scores[],int NumOfRecords)
{
...
}
您正在尝试复制char数组：
LastName[j] = LastName[k];
这不是你在C中复制字符串的方式。你必须这样做：
strncpy(LastName[j], LastName[k], 21);
修改
我忘了提及：在C中，char数组如果NULL（'\0'）终止则成为字符串。您必须将字符串传递给strncpy才能使其正常工作。