Question

我正在为我的班级编写一个研讨会（我是一个完整的初学者），我遇到了一些问题。

#include <stdio.h>

#define arraylength 100

void GetInt();
void GetFloar();

int main (void)
{
    int i, k, j;

    float price[arraylength];
    int barcode[arraylength];
    int quantity[arraylength];
    int lenght;
    printf("Grocery Store Inventory\n");
    printf("=======================\n");

    for (i = 0; i < arraylength; i++) {
        printf("Barcode: ");
        scanf("%d", &barcode[i]);
        GetInt;
    }

    if (barcode[i] == 0)
        break;

    printf("Price: ");
    scanf("%f", &price[i]);
    printf("Quantity: ");
    scanf("%d", &quantity[i]);
    return 0;
}

void GetInt()
{
    int number;

    printf("Barcode: ");
    while (scanf("%d", &number != 1)){
        printf("Wrong Input , Try Again!\n");
        printf("Insert Correct Barcode:\n");
        while(getchar() != "\n");
    }
    return number;
}

void GetFloat()
{
    float number;
    printf("Barcode: ");
    while (scanf("%d", &number != 1)){
        printf("Wrong Input , Try Again!\n");
        printf("Insert Correct Barcode:\n");
        while (getchar() != "\n");
    }
    return number;
}

我一直收到这些错误：

work.c: In function ‘main’:
work.c:23:5: error: break statement not within loop or switch
work.c: In function ‘GetInt’:
work.c:35:26: warning: comparison between pointer and integer [enabled by default]
work.c:38:18: warning: comparison between pointer and integer [enabled by default]
work.c:40:3: warning: ‘return’ with a value, in function returning void [enabled by default]
work.c: In function ‘GetFloat’:
work.c:45:26: warning: comparison between pointer and integer [enabled by default]
work.c:48:25: warning: comparison between pointer and integer [enabled by default]
work.c:50:7: warning: ‘return’ with a value, in function returning void [enabled by default]

有人可以告诉我发生了什么以及如何解决这个问题吗？

Answer 1

我会尝试指出我在代码中看到的所有错误

#include <stdio.h>

#define arraylength 100
//this might as well be: const int arraylength = 100;

void GetInt();
void GetFloar(); //this is spelled wrong

int main (void)
{
    int i, k, j;

    float price[arraylength];
    int barcode[arraylength];
    int quantity[arraylength];
    int lenght; //this is spelled wrong
    printf("Grocery Store Inventory\n");
    printf("=======================\n");

    for (i = 0; i < arraylength; i++) {
        printf("Barcode: ");
        scanf("%d", &barcode[i]);
        GetInt; //this does nothing; to call GetInt, use GetInt()
    }

    if (barcode[i] == 0) // i == arraylength here so this is illegal
        break; //you can only break from a loop or a switch statement

    printf("Price: ");
    scanf("%f", &price[i]); // i == arraylength here so this is illegal
    printf("Quantity: ");
    scanf("%d", &quantity[i]); // i == arraylength here so this is illegal
    return 0; 
}

void GetInt() //this should be declared as int GetInt(void)
{
    int number;

    printf("Barcode: ");
    while (scanf("%d", &number != 1)){ 
    //&number != -1 is not a valid parameter for scanf
    //Seems like it should be scanf("%d", &number) != 1
        printf("Wrong Input , Try Again!\n");
        printf("Insert Correct Barcode:\n");
        while(getchar() != "\n");
    }
    return number; //you can't return from a void function
}

void GetFloat() //this should be declared float GetFloat(void)
{
    float number;
    printf("Barcode: ");
    while (scanf("%d", &number != 1)){ 
    //&number != -1 is not a valid parameter for scanf
    //also you have the integer format string there
    //Seems like it should be scanf("%f", &number) != 1
        printf("Wrong Input , Try Again!\n");
        printf("Insert Correct Barcode:\n");
        while (getchar() != "\n");
    }
    return number; //you can't return from a void function
}

你应该使用双打而不是浮点数。除了图形处理之外，我不确定浮点数在哪里有用。

Answer 2

如果你在函数中有返回值，它们不能为void，它们必须是int（在你的情况下）：

int GetInt();
int GetFloat();

你的scanf（）函数是incorret，因为你无法比较它的值，它需要是：

while(scanf("%d", &number) != 1)

关于GetInt（）函数和：

while(scanf("%f", &number) != 1)

在GetFloat（）上，因为你正在使用浮点数。在main（）函数中，你什么都不打破，这是一个错误。您的代码必须是：

for (i = 0; i < arraylength; i++) {
   printf("Barcode: ");
   scanf("%d", &barcode[i]);
   GetInt();
   if (barcode[i] == 0){
      break;
   }else{
       printf("Price: ");
       scanf("%f", &price[i]);
       printf("Quantity: ");
       scanf("%d", &quantity[i]);
   }
}

有一些基本的安排。

麻烦为学校编程

2 个答案: