CTRL+D and CTRL+L signal handling

Code:

#include 

int main()
{
 char c;
 printf("Write: ");
 scanf("%c", &c);
 if(c == 0x0C) printf("ctrl+L was entered\n");
 return 1;
}

but the execution of this doesnt..

Code:

#include 

int main()
{
 char c;
 printf("Write: ");
 scanf("%c", &c);
 if(c == 0x04) printf("ctrl+D was entered\n");
 return 1;
}