prog.c: In function ‘main’:
prog.c:10:2: error: unknown type name ‘stud’
stud s;
^~~~
prog.c:10:2: note: use ‘struct’ keyword to refer to the type
prog.c:11:15: error: request for member ‘name’ in something not a structure or union
scanf("%s",&s.name);
^
prog.c:12:15: error: request for member ‘name’ in something not a structure or union
printf("%s",s.name);
^
prog.c:10:7: warning: variable ‘s’ set but not used [-Wunused-but-set-variable]
stud s;
^