c - 代码无法编译

Question

void Input(int arr[100])
{
    int index;
    printf("Enter the array\n");
    for(index = 0; index < 100; index++)
    {
        printf("Enter %d number\n", index+1);
        scanf("%d", &arr[index]);
    }
}

int minValue = 32767;
int index;
int sort;
for(a = 0;a < 100;a++)
{
    if(arr[a] < minValue)
    {
        index = a;
    }
}
for(a = 0;a < (sizeof(arr)) / 4;a++)
{
    index++;
    arr1[a] = arr[index];
}
for(a = 0;a < (sizeof(arr1))/4;a++)
{
    for(index = a;index < (sizeof(arr1))/4;index++)
    {
        if(arr1[a] > arr1[index])
        {
            sort = arr1[a];
            arr1[a] = arr1[index];
            arr1[index] = sort;
        }
    }
}
for(a = 0;a < (sizeof(arr1))/4;a++)
{
    printf("%d\n", arr1[a]);
}

int main()
{ 
    char choise = '0';
    int loaded = 0;
    int arr[100];
    do
    {   
        printf("---------------MENU----------------\n" );
        printf("- 1.Enter array -\n");
        printf("- 2.Use already entered array -\n");
        printf("- Space for exit program -\n");
        printf("-----------------------------------\n" );
        scanf("%c", &choise);
        if(choise == ' ')
        {
            printf("Bye Bye\n\n");
            return 0;
        }
        switch(choise)
        {
            case '1':
                Input(arr);
                loaded = 1;
                break;
            case '2':
                break;
            default:
                printf("You have entered an invalid value\n");
                break;
        }
        if(!loaded)
        {
            printf("You haven't enter an array yet.Please choose 1 first.\n");
        }
        else
        {
            magic(arr);
        }
    } while(choise != ' ');
    return 0;
} 

您好，这是我的第一个 C 项目，我认为有一些语法错误，并且无法编译？请向我解释一下我的错误在哪里？

我使用 Visual Studio 2010 编写代码。

我使用的指令还有:

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

这是编译器的错误:

1>------ Build started: Project: Georgi, Configuration: Debug Win32 ------
1>  Georgi.cpp
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(14): warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\stdio.h(304) : see declaration of 'scanf'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2059: syntax error : 'for'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2143: syntax error : missing ')' before ';'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2143: syntax error : missing ';' before '<'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2143: syntax error : missing ';' before '++'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20): error C2059: syntax error : ')'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(21): error C2143: syntax error : missing ';' before '{'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(21): error C2447: '{' : missing function header (old-style formal list?)
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2059: syntax error : 'for'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2143: syntax error : missing ')' before ';'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2143: syntax error : missing ';' before '<'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2143: syntax error : missing ';' before '++'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(27): error C2059: syntax error : ')'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(28): error C2143: syntax error : missing ';' before '{'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(28): error C2447: '{' : missing function header (old-style formal list?)
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2059: syntax error : 'for'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2143: syntax error : missing ')' before ';'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2143: syntax error : missing ';' before '<'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2143: syntax error : missing ';' before '++'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(32): error C2059: syntax error : ')'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(33): error C2143: syntax error : missing ';' before '{'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(33): error C2447: '{' : missing function header (old-style formal list?)
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2059: syntax error : 'for'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2143: syntax error : missing ')' before ';'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2143: syntax error : missing ';' before '<'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2143: syntax error : missing ';' before '++'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2086: 'int a' : redefinition
1>          c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(20) : see declaration of 'a'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(44): error C2059: syntax error : ')'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(45): error C2143: syntax error : missing ';' before '{'
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(45): error C2447: '{' : missing function header (old-style formal list?)
1>c:\users\alexievpc\documents\visual studio 2010\projects\georgi\georgi\georgi.cpp(84): error C3861: 'magic': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

您正在函数外部使用语句( for(a = 0;a < 100;a++) 到 int main() )。这不合法 C.

函数magic编译器不知道 - 包含正确的头文件或将其声明/定义添加到编译的源代码中。

另请注意，您的代码既没有声明 a也不arr1 ，后者也可能需要内存分配(不过，查看编译器消息，声明并不包含在您发布的代码片段中)。