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Characters

In C, single characters are written enclosed by single quotes. This is in contrast to strings of characters, which use double quotes ("..."). 

int ch;
ch = 'a';

would give ch the value of the character a. The same effect can also be achieved by writing: 

char ch = 'a';

It is also possible to have the type: 

unsigned char

This admits ASCII values from 0 to 255, rather than -128 to 127.