解决git clone时报错：The requested URL returned error: 401 Unauthorized while accessing

版本问题，最直接的解决办法就是重新编辑安装git吧：

下载安装源码

下载：wget -O git.zip https://github.com/git/git/archive/master.zip
解压：unzip git.zip
进入git目录：cd git-master

编译安装：

autoconf
./configure --prefix=/usr/bin/git
make
/usr/bin/perl Makefile.PL PREFIX='/usr/bin' INSTALL_BASE='' --localedir='/usr/bin/share/locale'
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at Makefile.PL line 3.
BEGIN failed--compilation aborted at Makefile.PL line 3.
make[1]: *** [perl.mak] 错误 2
make: *** [perl/perl.mak] 错误 2

make报错了，git 需要perl来编译。然后重新make执行如下

yum install perl-ExtUtils-MakeMaker package

再make，又报错

make
 tclsh failed; using unoptimized loading
    MSGFMT    po/bg.msg make[1]: *** [po/bg.msg] 错误 127
make: *** [all] 错误 2

执行如下

yum install tcl build-essential tk gettext

再make，遇到如下错误

In file included from credential-store.c:1:
cache.h:40:18: warning: zlib.h: No such file or directory
In file included from credential-store.c:1:
cache.h:42: error: expected specifier-qualifier-list before ‘z_stream’
make: *** [credential-store.o] Error 1

安装zlib和zlib-devel

yum install zlib zlib-devel -y

安装之后使用https操作git 出现 ：fatal: Unable to find remote helper for 'https'</li>

yum install -y curl curl-devel`

然后重新安装 git

make install

最后别忘了删掉旧的git，并把新版本的git建立软链接到 /usr/local/bin/git

ln -s /usr/bin/git/bin/git /usr/local/bin/git

#include <stdio.h>
int addition(int i,int j)
{       
        return i + j;
}
int substraction(int i,int j)
{       
        return i - j;
}
int multiplication(int i,int j)
{       
        return i * j;
}
int division(int i,int j)
{       
        return i / j;
}
void menu(void)
{       
        printf("**************************\n");
        printf("**  0 => addition       **\n");
        printf("**  1 => substraction   **\n");
        printf("**  2 => multiplication **\n");
        printf("**  3 => division       **\n");
        printf("**  4 => quit           **\n");
}
int main(void)
{
        // 定义数组，注意这个格式
        int (*actions[])(int,int) = {addition,substraction,multiplication,division};
        int action = 0,max_action_index = sizeof(actions) / sizeof(actions[0]) - 1,left,right,result;
        while(1)
        {
                menu();
                printf("Enter your action:");
                scanf("%d",&action);
                // 清空输出缓冲
                setbuf(stdin,NULL);
                if(action == 4)
                {
                        printf("Bye\n");
                        break;
                }
                if(action > 0 || action < max_action_index)
                {
                        printf("Enter your variables:");
                        scanf("%d %d",&left,&right);
                        result = actions[action](left,right);
                        printf("result is %d\n",result);
                }
                else
                {
                        printf("Bad action!\n");
                }
                // 清空输出缓冲
                while((action = getchar()) != '\n' && c != EOF);
                action = max_action_index;
                //setbuf(stdin,NULL);
        }
}

#include <stdio.h>
#include <stdarg.h>
void average(int length,...)
{       
        // 初始化 va_list 变量用于访问可变参数列表
        va_list list;
        int count;
        float sum=0;
        // 初始化可变参数列表,
        va_start(list,length);
        printf("%p\n",&length);
        printf("%p\n",list);
        printf("%d\n",(int)list - (int)(&length));// 就是在length的地址上加了4个字节
        // 循环获取 va_list 变量的值
        for(count=0;count < length;count++)
        {       
                //printf("%d\n",va_arg(list,int));
                sum+=va_arg(list,int);
        }
        printf("%f\n",sum);
        va_end(list);
}
/* 自己使用指针的方式实现不行了，好像这个实现已经改了  */
void average2(int length,...)
{       
        float sum=0;
        char *p=(char *)(&length);
        p=p+4;
        printf("%p\n",&length);
        printf("%p\n",p);
        printf("%d\n",(int)p - (int)(&length));
        for(int count=1;count<=length;count++)
        {
                //printf("%d => %d\n",count,*p);
                p+=4;
                //sum+=*(p+count);
        }
        //printf("%f\n",*p);
        //printf("%d\n",length);
        //printf("%d\n",sum);
}
int main(void)
{
        printf("average:\n");
        average(5,3,4,5,6,7);
        printf("average2:\n");
        average2(5,3,4,5,6,7);
        int i = 1, j = 2, k = 3, z = 4, num = 4;
        //printf("test1:\n");  
        //test(num, i, j, k, z);   
        return 0;
}