Отправлено: 07.07.17 20:05. Заголовок: What is this program not compiling?

This is the program:
#include<stdio.h>
int main()
{
char c[];
printf("Enter your sentence: ");
scanf("%s",&c);
printf("\n%s",c);
return 0;
}

I have no idea why isn't this compiling. The error message says "Array size mising" but I had watched a tutorial where the array size was not given but still it compiled and ran correctly. But this one is not compiling. Please help.

 Отправлено: 07.07.17 20:36. Заголовок: You did not specify ..

You did not specify the size of the array.

The program can look like

 
 #include<stdio.h>  
  
 #define N 100 
  
 int main( void )  
 {  
     char s[N];  
  
     printf( "Enter your sentence: " );  
     scanf( "%99s", s );  
     printf( "\n%s", s );  
      
     return 0;  
 }

However if you are going to enter a sentence then you need to use the standard function fgets instead of scanf.

Take into account that according to the C standard the function main without parameters shall be declared like

int main( void )