In C, why is sizeof(char) 1, when 'a' is an int?

Question

I tried

printf(\"%d, %d\\n\", sizeof(char), sizeof(\'c\'));

and got 1, 4 as output. If size of a character is one, why does \'c\'

Answer 1

Th C standard says that a character literal like 'a' is of type int, not type char. It therefore has (on your platform) sizeof == 4. See this question for a fuller discussion.