Char datatype in c language:

The memory allocated to a character variable is 1 byte while memory allocated to character constant is 4 byte because it returns ASCII value. 

#include<stdio.h> 
int main() {
  char s='a';
  printf("%d",(int)sizeof(s));  
  printf("%d",(int)sizeof('a'));
  return 0;
}

char ch1 = 'a'; 
char ch2 =  ch1;