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#include <stdio.h>
 
int main(void) {
	char A[2],B[2],C[2],D[2];
printf("Enter letter");
scanf("%s %s %s %s,A,B,C,D);
printf("%-40s%40s\n%-40s%40s","A","B","C","D");
	return 0;
}

prog.c: In function ‘main’:
prog.c:6:7: warning: missing terminating " character
 scanf("%s %s %s %s,A,B,C,D);
       ^
prog.c:6:7: error: missing terminating " character
 scanf("%s %s %s %s,A,B,C,D);
       ^~~~~~~~~~~~~~~~~~~~~~
prog.c:7:47: error: expected ‘)’ before ‘;’ token
 printf("%-40s%40s\n%-40s%40s","A","B","C","D");
                                               ^
prog.c:7:1: warning: passing argument 1 of ‘scanf’ makes pointer from integer without a cast [-Wint-conversion]
 printf("%-40s%40s\n%-40s%40s","A","B","C","D");
 ^~~~~~
In file included from /usr/include/features.h:364:0,
                 from /usr/include/stdio.h:27,
                 from prog.c:1:
/usr/include/stdio.h:448:12: note: expected ‘const char * restrict’ but argument is of type ‘int’
 extern int __REDIRECT (scanf, (const char *__restrict __format, ...),
            ^
prog.c:9:1: error: expected ‘;’ before ‘}’ token
 }
 ^
prog.c:4:22: warning: unused variable ‘D’ [-Wunused-variable]
  char A[2],B[2],C[2],D[2];
                      ^
prog.c:4:17: warning: unused variable ‘C’ [-Wunused-variable]
  char A[2],B[2],C[2],D[2];
                 ^
prog.c:4:12: warning: unused variable ‘B’ [-Wunused-variable]
  char A[2],B[2],C[2],D[2];
            ^
prog.c:4:7: warning: unused variable ‘A’ [-Wunused-variable]
  char A[2],B[2],C[2],D[2];
       ^

Standard output is empty