Writing user-defined functions and 'for loop'

See more:

C++

Hello ! I'm having trouble with my school homework as none of my friends know how to do this . So this code is for requirement 1 which is
1. PORTC pin 7 is connected to LED 7 and pin0 is connected to LED 0
2. A delay of 3 second interval between each output.
Basically what they're asking is :
LED7 LED0 Both LEDS off
0 0
LED7 LED0
1:1 0 Blink 5 times with ratio of 1:1
LED7 LED0
0 2:1 Blink 10 times with ratio of 2:1
LED7 LED0
1:1 1:1 Blink 10 times with ratio of 1:1

Now the problem is i need to rewrite the code so that it will do this for my next requirement :
1. No input are required
2. PORTD to LEDs (RD0 to L0 , RD1 to L1 and so on )
3. Write user-define delay functions
4. write user-defind function for the specific tasks
5. Use "for' loop to repeat a task. <<<< this is the part I don't understand.

So now its
L7-L0
All LEDs off, No function require
L7-L0
All LEDs Blinking , Blink with ratio of 1:1
L7-L0
Running LED from L0 to L7 , Introduce logical shift left command (<<)
L7-L0
Running LED from L7 to L0 , Introduce logical sh*t right command (>>)

Im pretty much stuck at requirement 2 and i would appreciate any help given .. Thanks

Here is the code for requirement 1 .
[C] writing user-defined functions and 'for loop' - Pastebin.com[^]

What I have tried:

I'm pretty much stuck with this and don't know what to do . I'm sorry if this is the basics but im pretty much new to this

[EDIT - the code from the link]

#include <p18f4520.h>
#include <delays.h>

//2.0 Configure Controller
#pragma config OSC = HS //set external High-speed (HS) oscillation
#pragma config WDT = OFF //disable the Watchdog feature of the MCU
#pragma config LVP = OFF //disable low voltage programming (LVP)
#pragma config PBADEN = OFF //Port B Analogue to Digital module is OFF

//3.0 Definition: define which pin each LED is connected to using bit-oriented instruction
#define L0 PORTCbits.RC0 //RC0 assigned as L0
#define L7 PORTCbits.RC7 //RC7 assigned as L7

//4.0 user define functions

//declare and define a long delay for 1:2
void delay_long(void)
{
	int x;
	for(x; x<20000;x++)
	{
		// do nothing for 20000 times
	}
}
//declare and define a short delay for 1:1
void delay_short(void)
{
	int x;
	for(x=0; x<10000;x++)
	{
		//do nothing for 10000 times
	}
}

//function for LED7 (1:1) and LED0 (0)
void display_1(void)
{
	L0=0;
	L7=1;
	delay_short();
	L7=0;
	delay_short();
}

//function for LED7 (0) and LED0 (2:1)
void display_2(void)
{
	L7=0;
	L0=1;
	delay_long();
	L0=0;
	delay_short();
}

//5.0 start of main program
void main(void)
{
	//5.1 Declare variables
	int i;

	//5.2 configure I/O ports
	TRISCbits.TRISC0 =0; //configure only RC0 as output
	TRISCbits.TRISC7 =0; //configure only RC7 as output

	//5.3 initialize variables and output ports
	i=0; //assign 0 to interger i
	PORTCbits.RC0 = 0; // clear bit RC0 only using a bitwise instruction
	PORTCbits.RC7 = 0; // clear bit RC7 only using a bitwise instruction

	// infinite loop
	while(1)
	{
		L0=0; //off both LEDs
		L7=0;

		Delay10KTCYx(3000); // 3 sec delay @4Mhz oscillator

		for(i=0; i<5;++) // loop 5 times
		{
			display_1(); //call the display_1() function
		}
		Delay10KTCYx(3000); //3 sec delay @4Mhz oscillator

		for(i=10; i<10; i++) // loop 10 times
		{
			display_2(); //call the display_2() function
		}

		Delay10KTCYx(3000); // 3 sec delay @4Mhz oscillator

		for(i=0; i<10;i++) //loop 10 times
		{
			L0=1; //on both LEDS
			L7=1;
			delay_short(); //call delay_short() function
			L0=0; //off both LEDS
			L7=0;
			delay_short(); //call delay_short() function
		}
	} //end of while loop
} //end of main program