Environment centos7 programming language c
Today, there is an error reading folders with the stat function. At first, the folder name is returned as-1. Later, it is found that the absolute path is needed. After the combination of the file name and path name is passed into stat, an error is reported. After changing it for a long time, no problem is found in gdb tracking.
the following is the code:

-sharpinclude <sys/types.h>
-sharpinclude <sys/stat.h>
-sharpinclude <dirent.h>
-sharpinclude <unistd.h>
-sharpinclude <string.h>

int main(void)
{
        DIR *dp;
        struct dirent *ep;
        struct stat st;
        char dirp[50];
        char absPath[100];
        printf(":\n");
        scanf("%s",&dirp);
        dp=opendir(dirp);
        printf("filename:\ttype:\tPermission\taccesstime\tlastmodtime\tsize\t\n");
        if(dp!=NULL)
        {
                printf("xxx\n");
                while(ep=readdir(dp))
                {
                        if(ep->d_name[0]!=".")
                        {
                                printf("xx\n");
                                if(strcmp(dirp,"/")==0)
                                {
                                        strcpy(absPath,dirp);
                                        strcat(absPath,ep->d_name);
                                }else
                                {
                                        strcpy(absPath,dirp);
                                        strcat(absPath,"/");
                                        strcpy(absPath,ep->d_name);
                                }
                                printf("%s\n",absPath);
                                if(stat(absPath,&st)!=-1)
                                {
                                        printf("%s\t",ep->d_name);
                                        if((st.st_mode&S_IFMT)==S_IFDIR)
                                                printf("Directory\t");
                                        else if((st.st_mode&S_IFMT)==S_IFBLK)
                                                printf("Block special file\t");
                                        else if((st.st_mode&S_IFMT)==S_IFCHR)
                                                printf("character special file\t");
                                        else if((st.st_mode&S_IFMT)==S_IFREG)
                                                printf("Ordinary file\t");
                                        else if((st.st_mode&S_IFMT)==S_IFIFO)
                                                printf("pipefile file\t");
                                        printf("%o\t",st.st_mode&0x1ff);
                                        printf("%15s\t",ctime(st.st_atime));  // 
                                        printf("%15s\t",ctime(st.st_mtime)); // 
                                        printf("%ld\n",st.st_size);
                                }
                        }
                }
                closedir(dp);
        }else
        {
                puts("Couldn"t open the directory.\n");
        }
        return 0;
       }

run screenshot:

GDB:

I hope you guys can give me a hint for this beginner. Thank you