函数类型冲突？

Question

我有一个程序，它在一个结构数组中接收有关 5 个学生的信息，然后使用该信息进行计算以确定学费。现在，我遇到了很多错误，我不知道如何修复。 例如，它说

#include <stdio.h>
#include <stdlib.h>
#define UnitCost 100
#define MAX 60
int calculator(int x, char y);
void getInput(struct student* memb);
void printOutput(struct student * memb);

typedef struct student{
    char name[MAX];
    char housing;
    int total;
    int units;
    } student;
int main()
{
    struct student user[5];
    int total[5] = {0,0,0,0,0};
    int loopControl;
    int i;
    char name[5][MAX];
    int units;
    char housing;
    for (loopControl = 0; loopControl <= 4; loopControl++){

        getInput(&user);
        total[loopControl] = calculator(units, housing);


    }
    for(i = 0; i < 5; i++){
    printf("\nStudent Name: %s", user[i].name);
    printf("\nAmount due: $%d\n", user[i].total);
    }
    printf("\nAverage: %d\n", (total[0] + total[1] + total[2] + total[3] + total[4])/5);
    return 0;
}
// -----------------------------------------------------------------------------
int calculator(int x, char y){
    int onCampusCost = 0;
    int unitCostTotal = 0;
    int unitsEnrolledDiscount = 0;
    if (x > 12){
           unitsEnrolledDiscount = (x - 12) * 10;
        }
    if (y == 'n'){
        onCampusCost = 0;
        }
        else if (y == 'y'){
        (onCampusCost = 1000);
        }
    if (x >12){
        unitCostTotal = (x * 100) - ((x - 12) * 10);
    }
    else{
        unitCostTotal = x * 100;
    }

    return onCampusCost + unitCostTotal;

}

void printOutput(struct student * memb){
}
void getInput(struct student* memb){
    char name[5][MAX];
    char house;
    int uns;
    printf("Enter student name: ");
    if (iter > 0) getchar();
    gets(name);
    memb->name = name;
    printf("Do you live on campus?\ny/n: ");
    scanf("%c", house);
    memb->housing = house;

    printf("How many units are you enrolled in?: ");
    scanf("%d", uns);
    memb->units = uns;
}

错误:

||=== Build: Debug in f (compiler: GNU GCC Compiler) ===| warning: 'struct student' declared inside parameter list| warning: 'struct student' declared inside parameter list|

|In function 'main':|

warning: passing argument 1 of 'getInput' from incompatible pointer type|

note: expected 'struct student ' but argument is of type 'struct student ()[5]'|

warning: unused variable 'name' [-Wunused-variable]|

In function 'calculator':| warning: variable 'unitsEnrolledDiscount' set but not used [-Wunused-but-set-variable]|

error: conflicting types for 'printOutput'|

note: previous declaration of 'printOutput' was here|

error: conflicting types for 'getInput'|

note: previous declaration of 'getInput' was here|

In function 'getInput':|

error: 'iter' undeclared (first use in this function)|

note: each undeclared identifier is reported only once for each function it appears in|

warning: passing argument 1 of 'gets' from incompatible pointer type|

note: expected 'char ' but argument is of type 'char ()[60]'|

error: assignment to expression with array type|

warning: format '%c' expects argument of type 'char *', but argument 2 has type 'int' [-Wformat=]|

warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]| ||=== Build failed: 4 error(s), 9 warning(s) (0 minute(s), 0 second(s)) ===|

请大家帮忙

Answer 1

@Lumii 问题出在您的代码中:-

1. 您已经定义了函数声明，其中在结构定义之前将 (struct Student *) 作为参数传递。因为结构是用户定义的数据类型，这就是编译器给你错误的原因，因为编译器没有得到结构的定义。因此，要么将所有函数声明写在结构定义之后，要么将结构名称写在函数声明之前。喜欢:-

结构学生；

int 计算器(int x, char y);

void getInput(struct Student* memb);

void printOutput(struct Student * memb);