c - 存储用户输入的同时仍然提出问题

Question

首先，我知道下面的源代码很长，你实际上不应该发布这样的代码，但我真的不明白为什么它不起作用，或者我如何在不这样发布的情况下解释我的问题。

我试图存储其中提出的每个问题的答案并将其显示在脚本的末尾。我遇到的最大问题是我收到错误
“下标值既不是数组，也不是指针，也不是 vector scanf("%s", a[i].incdest);”

程序不接受a[i].incdest。它对所有数组值执行此操作。

这也表明在函数中主变量“comp1”未声明。

#include<stdio.h>
#include<string.h>

int c_s(char*, char*);

typedef struct
{
    char constab[30];
    char vicwit[15];
    char witdet[200];
    char incdest[300];
    char comp1[15];
    char comp2[200];;
} sheetstore;

#define ARRAYLEN 2

sheetstore a[ARRAYLEN];
FILE *fp;

int main()
{
    int i, a;
    char wit[10] = "witness";
    char yes[10] = "yes";
    char comp1[10];

    fp = fopen("sheetstore.dat","a+");

    printf("Hate crime reporting system\n\n\n");

    printf("If the crime you are reporting is an emergency,\nplease call 999, do not proceed any further with this form\n\n\n\nPlease press enter to confirm you have read the above and continue\n");
    char enter = 0;
    while (enter != '\r' && enter != '\n') { enter = getchar(); }

    for( i=0; i<ARRAYLEN ; i++)
    {
        printf("Which police constabulary did the offence take place in?\n\n");
        scanf("%s", a[i].constab);
        printf("Are you a victim or witness of the crime?\nPlease answer victim/witness\n\n");
        scanf("%s", a[i].comp1);
        int res1 = (strcmp (comp1, wit));
        if(res1 == 0){
            printf("Please enter the details including phone number and address of any other witnesses that were present\n");
        }
        scanf("%s", a[i].witdet);
        else{
            printf("Where did the incident take place?\nIf in a house please provide the full address including postcode\n");
            scanf("%s", a[i].incdest);
        }

        fwrite(&a[i], sizeof(a), 1, fp);
    }
    fclose(fp);

    fopen("sheetstore.dat", "r");
    for(i=0; i<ARRAYLEN; i++)
    {
        fread(&a[i], sizeof(a), 1, fp );
        printf("Which police constabulary did the offence take place in? : %s\n", a[i].constab);
        printf("Are you a victim or witness of the crime? : %s\n", a[i].comp1);
        printf("Please enter the details including phone number and address of any other witnesses that were present : %s\n", a[i].witdet);
        printf("Where did the incident take place? : %s\n", a[i].incdest);
    }
    fclose(fp);

    return 0;
}

Answer 1

我在您的代码中看到的主要问题是您隐藏了数组 a ( sheetstore a[ARRAYLEN]; ) 通过声明 int在您的main()中具有相同的名称。

你还有一个scanf语句错位。

我修复了你的代码并为每个更改添加了注释 - 现在，我不想检查你的代码的功能，但至少这会编译，并希望能让你更好地理解你错在哪里 - 来自这取决于你:

#include<stdio.h>
#include<string.h>

int c_s(char*, char*);

typedef struct
{
    char constab[30];
    char vicwit[15];
    char witdet[200];
    char incdest[300];
    char comp1[15];
    char comp2[200];;
} sheetstore;

#define ARRAYLEN 2

sheetstore sheetArr[ARRAYLEN]; //change this 'a' to avoid shadowing by the decleration on 'int a' in main
FILE *fp;

int main()
{
    int i, a;
    char wit[10] = "witness";
    char yes[10] = "yes";
    char comp1[10];

    fp = fopen("sheetstore.dat","a+");

    printf("Hate crime reporting system\n\n\n");

    printf("If the crime you are reporting is an emergency,\nplease call 999, do not proceed any further with this form\n\n\n\nPlease press enter to confirm you have read the above and continue\n");
    char enter = 0;
    while (enter != '\r' && enter != '\n') { enter = getchar(); }

    for( i=0; i<ARRAYLEN ; i++)
    {
        printf("Which police constabulary did the offence take place in?\n\n");
        scanf("%s", sheetArr[i].constab);//change name from 'a'
        printf("Are you a victim or witness of the crime?\nPlease answer victim/witness\n\n");
        scanf("%s", sheetArr[i].comp1);//change name from 'a'
        int res1 = (strcmp (sheetArr[i].comp1, wit));//compare with the value set in the struct
        if(res1 == 0){
            printf("Please enter the details including phone number and address of any other witnesses that were present\n");
            /*this scanf should be inside the brackets of 'if(res1 == 0)' */
            scanf("%s", sheetArr[i].witdet);//change name from 'a'
        }
        else{
            printf("Where did the incident take place?\nIf in a house please provide the full address including postcode\n");
            scanf("%s", sheetArr[i].incdest);//change name from 'a'
        }

        fwrite(&sheetArr[i], sizeof(sheetstore), 1, fp);//write a single struct
    }
    fclose(fp);

    fopen("sheetstore.dat", "r");
    for(i=0; i<ARRAYLEN; i++)
    {
        fread(&sheetArr[i], sizeof(sheetstore), 1, fp );//read a single struct
        printf("Which police constabulary did the offence take place in? : %s\n", sheetArr[i].constab);
        printf("Are you a victim or witness of the crime? : %s\n", sheetArr[i].comp1);
        printf("Please enter the details including phone number and address of any other witnesses that were present : %s\n", sheetArr[i].witdet);
        printf("Where did the incident take place? : %s\n", sheetArr[i].incdest);
    }
    fclose(fp);

    return 0;
}