int two_d[5][10] ;

two_d[0][0] , two_d[0][1] , two_d[0][2] , …. two_d[0][9] ,
two_d[1][0] , two_d[1][1] , two_d[1][2] , …. two_d[1][9] ,
two_d[2][0] , two_d[2][1] , two_d[2][2] , …. two_d[2][9] ,
two_d[3][0] , two_d[3][1] , two_d[3][2] , …. two_d[3][9] ,
two_d[4][0] , two_d[4][1] , two_d[4][2] , …. two_d[4][9] ,

int matrix[3][4] = {    0,1,2,3,
                                    4,5,6,7,
                                   8,9,10,11 } ;

#include <16F877.h> //register definition file for 
#fuses HS,NOWDT               //a Microchip PIC16F877
#use delay(clock=10000000 //setup the RS232 port for standard output
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,stream=RS232,bits=8)
#include <stdio>

#define TRUE 1
#define FALSE 0

char getkeycode(char *row , char *col);
// the getkeycode routine gets the key press and 
// returns TRUE  if a key is pressed , FALSE if not 

/* look up table for ASCII values */ 
const char keys[4][3] = {       '1' , '2' , '3' ,
                                                '4' , '5' , '6' ,
                                                '7' , '8' , '9' ,
                                                '*' , '0' , '#'   } ;

void main(void}
{
            char row , col ;
            char I ;

            while(1) // while forever… 
            {
i = getkeycode( &row , &col);
// TRUE , if there was a key pressed 
// and row and col contain whitch key
if( i == TRUE) 
                                                // only print the key value that is preassed 
putchar( keys[row][col] ) ;
            }
}

char day_of_week[7][10] = {
            "Sunday" ,
            "Monday" ,
            "Tuesday" ,
            "Wednesday" , 
            "Ttursday" ,
            "Friday" , 
"Saturday"  } ;

prtntf("%s" , day_of_the_week[3][0] ) ;                // prints Wednesday 

prtntf("%s" , day_of_the_week[3] ) ;                         // prints Wednesday 

struct structure_tag_name {
            type member_1;
            type member_2;
            ……………….
            type member_x;
} ; 

OR
struct structure_tag_name {
            type member_1;
            type member_2;
            ……………….
            type member_x;
} structure_var_name;

structure_var_name.member_1  structure_var_name.member_x 

struct DATE {
            int month ; // declare a template for a 
            int day ; // data structure 
            int year ; 
}
// declare a structure variable and initialize ..
struct DATE date_of_birth = { 2, 21, 1961 } ; 

struct PART new_location ( int x , int y )
{
            struct PART temp ; 
            temp.part_name = "" ; // initialize the name to NULL
            temp.sku = 0 ; // and zero to sku number 
            temp.bin.x = x ; // set the location to the passed x and y 
            temp.bin.y = y ; 

            return temp ; // and then returns the structure to the caller 
}

widget = new_location ( 10 , 10 ) ;

union union_tag_name {
            type member_1 ;
            type member_2 ;
            ………………….
            type member_x ;
} ; 

OR

union union_tag_name {
            type member_1 ;
            type member_2 ;
            ………………….
            type member_x ;
} union_var_name ;

union SOME_TYPES {
            char character ; 
            int integer ; 

            long int long_one ;
} my_space;

unsigned char read_eeprom ( unsigned char address ) ;
void write_eeprom ( unsigned char address ,  unsigned char value ) ;

// define port names and bit names
#byte PORTD = 0x08 
#bit PORTD0 = PORTD.0
#bit PORTD1 = PORTD.1
#bit PORTD2 = PORTD.2
#bit PORTD3 = PORTD.3
#bit PORTD4 = PORTD.4
#bit PORTD5 = PORTD.5
#bit PORTD6 = PORTD.6
#bit PORTD7 = PORTD.7

#byte PORTC = 0x07
#bit PORTC2 = PORTC.2

void main(void) 
{
            set_tris_d(0x00) ;                  // set all of port D to ouyput
            set_tris_c(0xFB) ;                  // set all port C bit 2 to output

            while(1)
{
            PORTD++ ;               //lights !!

            if(PORTD4)
                        PORTC2 = 1 ; 
            else
                        PORTC2 = 0 ; 
}
delay_ms(10) ;
}

#include <16F877.h>              //  register definition file for 
#fuses HS , NOWDT                         // a Microchip PIC16F877

#byte PORTA = 0x05
#byte DDRA = 0x85

#bit DDRA0 = DDRA.0
#bit DDRA1 = DDRA.1
#bit PORTA0 = PORTA.0
#bit PORTA1 = PORTA.1

void main(void)
{
            DDRA0 = 0 ;                          // set bit 0 of port A as output
            DDRA1 = 1 ;                          // set bit 1 of port A as input 
            PORTA0 = 1 ;                        // set bit 0 of port A to a 1

while(1)
{
            if ( PORTA1 )            // test bit 1 input of port A 
                        PORTA0= 0 ;
            else
                        PORTA0 = 1 ; 
}
}