[완료] 왕초보입니다. gcc 에러메세지의 의미가..

   1 #include <stdio.h>
   2 
   3 int main()
   4 {
   5     char s[1001];
   6     scanf("%s", s);
   7     printf("%d", (int)strlen(s));
   8     return 0;
   9 }   
  10 

err.c: In function ‘main’:
err.c:7:20: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
  printf("%d", (int)strlen(s));
                    ^
err.c:7:20: warning: incompatible implicit declaration of built-in function ‘strlen’
err.c:7:20: note: include ‘<string.h>’ or provide a declaration of ‘strlen’