构建C程序时出错

Question

这是我的2个源文件:

main.c中:

#include <stdio.h>
#include "part2.c"

extern int var1;
extern int array1[];

int main()
{
    var1 = 4;
    array1[0] = 2;
    array1[1] = 4;
    array1[2] = 5;
    array1[3] = 7;

    display();

    printf("---------------");

    printf("Var1: %d", var1);
    printf("array elements:");

    int x;
    for(x = 0;x < 4;++x)
        printf("%d: %d", x, array1[x]);

    return 0;
}

part2.c

#include <stdio.h>

int var1;
int array1[4];

void display(void);

void display(void)
{
    printf("Var1: %d", var1);
    printf("array elements:");

    int x;
    for(x = 0;x < 4;++x)
        printf("%d: %d", x, array1[x]);
}

当我尝试编译程序时,这就是我得到的:

Ld/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug/Test normal x86_64 cd/Users/John/Xcode/Test setenv MACOSX_DEPLOYMENT_TARGET 10.7 /Applications/Xcode.app/Contents/Developer/工具链/ XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk -L/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug -F/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Products/Debug -filelist/Users/John/Library/Developer /Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/Test.LinkFileList -mmacosx-version-min = 10.7 -o/Users/John/Library/Developer/Xcode中/ DerivedData /试验blxrdmnozbbrbwhcekmouessaprf /编译/产品/调试/测试

ld:/Users/John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/part2.o和/ Users /中的重复符号 _display架构x86_64 clang的John/Library/Developer/Xcode/DerivedData/Test-blxrdmnozbbrbwhcekmouessaprf/Build/Intermediates/Test.build/Debug/Test.build/Objects-normal/x86_64/main.o:错误:链接器命令失败并带有退出代码1(使用-v查看调用)

我正在使用Xcode,这两个文件都在一个名为C的项目中 Test

是什么导致错误,我该如何解决？

Answer 1

删除" #include "part2.c""并将其更改为" #include "part2.h"

并移动您的函数声明:

void display(void);

从" part.c"文件的顶部到名为" part2.h" 的文件,该文件应包含在两个.c文件中(或置于顶部).c文件.