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# include <stdio.h>
 
int mystrlen(char *str);
int main(void)
{
	char input[100];
	int input;
 
	printf("문장을 입력하시오.");
	scanf("%s",input);
	printf("문장의 길이는 %d입니다." mystrlen(input));
}
int mystrlen(char *str);
{
	int i;
	for(i=0; str[i]='\0'; i++);
	return i;
}

prog.c: In function ‘main’:
prog.c:7:6: error: conflicting types for ‘input’
  int input;
      ^~~~~
prog.c:6:7: note: previous declaration of ‘input’ was here
  char input[100];
       ^~~~~
prog.c:10:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  scanf("%s",input);
          ^
prog.c:11:44: error: expected ‘)’ before ‘mystrlen’
  printf("문장의 길이는 %d입니다." mystrlen(input));
                                            ^~~~~~~~
prog.c:11:31: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
  printf("문장의 길이는 %d입니다." mystrlen(input));
                               ^
prog.c: At top level:
prog.c:14:1: error: expected identifier or ‘(’ before ‘{’ token
 {
 ^

Standard output is empty