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#include <stdio.h>
 
int main(void) {
	//your code goes here
	int dan,i;
	printf("[구구단 출력]\n\n");
	printf("몇 단을 출력 하시겠사옵니까? ")
	scanf("%d",&dan);
	for(i=1;i<10;i++)
    printf("%d&%d-%d\n ");
    return 0:
}

prog.c: In function ‘main’:
prog.c:8:2: error: expected ‘;’ before ‘scanf’
  scanf("%d",&dan);
  ^~~~~
prog.c:10:14: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
     printf("%d&%d-%d\n ");
              ^
prog.c:10:17: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
     printf("%d&%d-%d\n ");
                 ^
prog.c:10:20: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
     printf("%d&%d-%d\n ");
                    ^
prog.c:11:13: error: expected ‘;’ before ‘:’ token
     return 0:
             ^
prog.c:5:6: warning: unused variable ‘dan’ [-Wunused-variable]
  int dan,i;
      ^~~

Standard output is empty