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#include <stdio.h> 
#include<string.h>
int main(void) {
  char n1[50],n2[50];
  printf("enter your name");
  scanf("%c",n1);
  strcat(hi,n1);
  printf("%c",n1);
 
	return 0;
}

prog.c: In function 'main':
prog.c:7:10: error: 'hi' undeclared (first use in this function)
   strcat(hi,n1);
          ^
prog.c:7:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:8:10: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat=]
   printf("%c",n1);
          ^
prog.c:4:15: warning: unused variable 'n2' [-Wunused-variable]
   char n1[50],n2[50];
               ^

Standard output is empty