unable to understand the code...

embed_v · Jun 6, 2011

hiii

i have some code with structure, enum, fun plz tell me the flow of code
for understanding structure and like other stuff.

Code:

enum A_MODE{
	A = 0,
	B,
        C,
        D,
        E,	 
 };


typedef struct _a_mode
{
	unsigned int sen;
	unsigned int state;
	unsigned int last ;
	unsigned int thick;
	unsigned int count;
	unsigned int status;
} A_MODE;

A_MODE a_modes[MAX];


int Execute(void)
{
 (i am including only some part of this fun. )
	case BILL_PICKING:
				switch (a_mode[slot].sen)
				{
				case CASSETTE_A:
					sensor = SENSOR_A;
					break;

				case CASSETTE_B:
					sensor = SENSOR_B;
					break;
				}
				if (sensor)
				{
					 
					a_modes[slot].state = B;
					a_modes[slot].last= TimingCount;
				}
                                else
                                {}
                               }
}

seadolphine2000 · Jun 6, 2011

enum A_MODE{
A = 0,
B,
C,
D,
E,
};

This is a definition for an enum template called "A_MODE". This enum has five values; A,B,C,D,E. The numerical value of A is 0, numerical value of B is 1 and so on.

typedef struct _a_mode
{
unsigned int sen;
unsigned int state;
unsigned int last ;
unsigned int thick;
unsigned int count;
unsigned int status;
} A_MODE;

A_MODE a_modes[MAX];

This is a definition of structure called "_a_mode" and you create an alias (nickname) for this template called "A_MODE". You then create an array of this structure, the array is called "a_modes" and the number of elements in this array is "MAX".

int Execute(void)
{
(i am including only some part of this fun. )
case BILL_PICKING:
switch (a_mode[slot].sen)
{
case CASSETTE_A:
sensor = SENSOR_A;
break;

case CASSETTE_B:
sensor = SENSOR_B;
break;
}
if (sensor)
{

a_modes[slot].state = B;
a_modes[slot].last= TimingCount;
}
else
{}
}
}

This is switch case statement that checks for the value of the property "sen" of the structure "A_MODE" (it should be "a_modes"), and according to the value of the "sen", a different decision will be taken.

Hope this helps.

alexan_e · Jun 6, 2011

Enumerations are listed constants

Code C - [expand]
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enum A_MODE{
A = 0,
B,
C,
D,
E,
};

A with be 0 , B=1, C=2, D=3, E=4

Structures are used to group variables under one heading or name.

Code C - [expand]
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typedef struct _a_mode
{
    unsigned int sen;
    unsigned int state;
    unsigned int last ;
    unsigned int thick;
    unsigned int count;
    unsigned int status;
} A_MODE;
 
//if you declare a variable of type A_MODE which represents the above structure
A_MODE mystracture;
 
// then you will have all the above members, each one is an individual unsigned int variable, they are just grouped under a variable name
mystracture.sen
mystracture.state
mystracture.last 
mystracture.thick
mystracture.count
mystracture.status

the next line

Code C - [expand]
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A_MODE a_modes[MAX]; // declares an array of the above structure
 
//then you will have: 
 a_modes[0].sen
 a_modes[0].state
 a_modes[0].last 
 a_modes[0].thick
 a_modes[0].count
 a_modes[0].status
 
 a_modes[1].sen
 a_modes[1].state
 a_modes[1].last 
 a_modes[1].thick
 a_modes[1].count
 a_modes[1].status
 
// up to MAX-1
 a_modes[MAX-1].sen
 a_modes[MAX-1].state
 a_modes[MAX-1].last 
 a_modes[MAX-1].thick
 a_modes[MAX-1].count
 a_modes[MAX-1].status

Alex

embed_v · Jun 7, 2011

thanx 2 all

unable to understand the code...

embed_v

Junior Member level 1

seadolphine2000

Advanced Member level 3

alexan_e

Administrator

embed_v

Junior Member level 1

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Code C - [expand]
1 2 3 4 5 6 7	enum A_MODE{ A = 0, B, C, D, E, };

unable to understand the code...

embed_v

Junior Member level 1

seadolphine2000

Advanced Member level 3

alexan_e

Administrator

embed_v

Junior Member level 1

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