ABL electronic PIC Microcontrollers PIC18 User Manual

Division of two integers returns an integer, while remainder is simply truncated:

/* for example: */

7 / 4;        

// equals 1

7 * 3 / 4;    

// equals 5

/* but: */

7. * 3./ 4.;  

// equals 5.25 as we are working with floats

Remainder operand % works only with integers; sign of result is equal to the sign
of first operand:

/* for example: */

9 % 3;

// equals 0

7 % 3;

// equals 1

-7 % 3;

// equals -1

We can use arithmetic operators for manipulating characters:

'A' + 32;

// equals 'a' (ASCII only)

'G' - 'A' + 'a';

// equals 'g' (both ASCII and EBCDIC)

Unary operators 

++

and 

--

are the only operators in C which can be either prefix

(e.g. 

++k

, 

--k

) or postfix (e.g.

k++

, 

k--

).

When used as prefix, operators 

++

and 

--

(preincrement and predecrement) add or

subtract one from the value of operand before the evaluation. When used as suffix,
operators 

++

and 

--

add or subtract one from the value of operand after the evalu-

ation.

For example:

j = 5; j = ++k;

/* k = k + 1, j = k, which gives us j = 6, k = 6 */

j = 5; j = k++;

/* j = k, k = k + 1, which gives us j = 5, k = 6 */

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