c 字符串拼接

c 字符串拼接

/*
不断地在目录之间跳转，用字符串记录路径。拼接文件夹和文件名
*/
#include
#include

int main(void)
{
 char fullpath [100] = "/home/dimgtui"; //记录路径名
 printf("fullpath:%s ",fullpath);
 
 char * ptr;//记录fullpath的最后位置，用于拼接
 ptr = fullpath + strlen(fullpath);
 *ptr ++ = '/';
 *ptr = 0;

 char * filename = "filename1";
 strcpy(ptr,filename);
 printf("fullpath:%s ",fullpath);
 
 //恢复之前的fullpath
 ptr[-1] = 0;
 printf("fullpath:%s ",fullpath);
 exit(0);
}

/*output
         fullpath :"/home/dimgtui"
         fullpath :"/home/dimgtui/filename1"
  fullpath :"/home/dimgtui"
*/