Expressions and operators

Arithmetic.... + - * / % ++ --

Logical.........< <= > >= == !=..|| && !

Bit.............& | ^ ~ ..<< >>

Assignment.... =.. += -= *= etc.

Conditional...(expr)?..value1:..value2

Pointer.........* & -> . sizeof

Type............(type) var...or...(type)(expr)

Division / produces an int if both operands are int, otherwise float.

a%b is a mod b, the remainder after dividing a by b.

++b means preincrement; a.=.++b; is equivalent to.b=b+1;. a=b;

b++ means postincrement; a = b++; is equivalent to a=b; b=b+1;

Use == to test for equality, not = (assignment operator).

&& is short-circuit and; a && b means "evaluate a; if it's false,ignore b
....and produce a false value, otherwise evaluate b and return its (logical)
....value".

The first four bit operators are, in order, And, Or, Exclusive Or, Comple-
....ment, each taken bitwise.

a<<3 means a shifted left 3 bits (multiplied by 8). >> is right shift.

a += 5; is equivalent to a = a+5;.

A conditional evaluates expr; if it's true, it evaluates value1, otherwise it
....evaluates value2.

sizeof(type name) computes the number of bytes needed to represent a
....value of the named type.

A type cast (int) (x/y) coerces a value into the named type.

Examples

Arithmetic
....a+1
....offset%2
....++n
....n++

Logical
....x>0
....(k<n) && (A[k]==key)
....!found

Bit
....status & mask
....1 << offset

Assignment
....sum += A[k];
....status | = OVERFLOW;

Conditional
....max = (a>b)? a : b;
....tax = (income>100000)? 0 :(income>50000)? 10000
........: income;

Pointer
....p = p->next;
....*cp++ = c;
....next_char = *++cp;
....malloc(sizeof (struct listnode))

Type
....ratio = (float) m/n;
....p = (struct listnode *)malloc(sizeof(structlistnode));