4seminar

r means “needs to rework”

Enumerated type

enum color {white = 10, green = 14, red, blue, black = 7, yellow}

index	name	value
0	white	10
1	green	14
2	red	15
3	blue	16
4	black	7
5	yellow	8
enum color my_color; - declare variable of type enum color
my_color = red - assign red

Compiler inserts values instead names

Switch r

switch (<expression>)
{
case 1: <operators>; break;
case 2: <operators>; break;
...
default: <operators>; break;
}

we can merge cases

switch (<>)
{
case 4:
case 5:
case 6: <operators>; break;
default: <operators>; break;
}

break exits switch(). may not write it.

using enum

enum month {jan = 1, feb, ..., dec}
enum month ml = feb

switch (ml) {
case feb: <operators>; break;
case apr:
case dec: <operators>; break;
default: <operators>; break;
}

Constants

enum {N = 5}; - enumerated constant (have field of view)
#define N 1024 - preprocessor constant

Use define only with CAPITAL letters

const int count = 7; - read only variable (technically it’s variable). It’s compile time constant

Functions

int func (int m, int n, double x) {return 0}

procedure is also function

void funcV (int* m, int* n) {}

&m is address of m or it’s pointer
*m - take value from address
int* is int pointer type