To change the text color in C you need to install my ‘.c’ file using the link below :

Change-Colour

After downloading the file copy it and paste it in C > MinGW > include

Then you need to include my file like this ‘#include <Change_Colour.c>‘

The basic code will be :

#include <stdio.h>
#include <Change_Colour.c>

int main()
{
    
    return 0;
}

Simple Functions

Now to change color the functions are as follows :

By using these functions you can change the color of the output text.

Advanced Functions

There is one advanced function in this file : change_colour(color_val, bold);

The color can be changed by the value of the parameter ‘color_val’.

The following table shows describes it :

Now for the second parameter ‘bold’ there can be 2 values ‘1’ or ‘0’ as describes in the following table:

The code can be like this as follows :

#include <stdio.h>
#include <Change_Colour.c>

int main()
{
    printf("\n");

    change_colour_to_black();
    printf("black \n");
    change_colour_to_blue();
    printf("blue\n");
    change_colour_to_cyan();
    printf("cyan\n");
    change_colour_to_green();
    printf("green\n");
    change_colour_to_purple();
    printf("purple\n");
    change_colour_to_red();
    printf("red\n");
    change_colour_to_white();
    printf("white\n");
    change_colour_to_yellow();
    printf("yellow\n");

    change_colour(7, 0);
    printf("Text unbold\n");
    change_colour(7, 1);
    printf("Text bold\n");

    printf("\n");

    return 0;
}

Output :

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So for this you will need ‘Loading Screen.c’ which you can get using the link below :

Loading-Screen-C

After downloading the file copy it and paste it in C > MinGW > include

The basic code will be :

#include <stdio.h>
#include <Loading Screen.c>

int main()
{
    return 0;
}

Here we have included the ‘Loading Screen.c‘ file.

Now to add a loading screen we will use ‘loading_screen()‘

The parameters are as follows :

Now you can modify the code like this :

#include <stdio.h>
#include <Loading Screen.c>

int main()
{
    loading_screen(20, 50, 1, 5, 5, 1, 1);
    return 0;
}

Output :

 |####################|

I we put type = 2 and arrow = 1 then the loading screen will be :

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Basics Of Function

This is our basic code structure :

#include <stdio.h>

int main()
{
    /* code */
    return 0;
}

Now if I want to ask a user input for five times and print it back then the code will be as follows :

PS C:\C> .\a.exe   
Enter no : 3
You entered 3
Enter no : 53
You entered 53
Enter no : 12 
You entered 12
Enter no : 53 
You entered 53
Enter no : 23
You entered 23
PS C:\C>

Then the code will be :

#include <stdio.h>

int main()
{
    int no;

    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n", no);

    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n", no);

    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n", no);

    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n", no);

    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n", no);

    return 0;
}

But I have an alternative. I will create a function. Here is an example of function :

void get_no()
{
    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n\n", no);
}

This code will ask the number and print it back to the user when executed. Now to execute it we will modify the code like this :

#include <stdio.h>

void get_no()
{
    printf("Enter no : ");
    scanf("%d", &no);
    printf("You entered %d\n\n", no);
}

int main()
{
    get_no();
    return 0;
}

In main function we have called/executed out function.

Arguments Of Functions

Functions too take arguments in C. For example I want to print

1. Enter no 1 :
2. Enter no 2 :
3. Enter no 3 :
4. Enter no 4 :
5. Enter no 5 :

Then I can modify the code like this :

#include <stdio.h>

void get_no(int no)
{
    printf("Enter no %d : ", no);
    scanf("%d", &no);
    printf("You entered %d\n\n", no);
}

int main()
{
    get_no(1);
    get_no(2);
    get_no(3);
    get_no(4);
    get_no(5);
    return 0;
}

We have entered ‘int no‘ in the two round brackets of declaration of our function.

Now to execute in we need to put the argument. Here i have put 1,2,3,4,5 an the arguments.

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#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>

First we will include all the header files.

int choice;
char save_bill_or_not;
int order_no = 0;
int total = 0;
int active = 1;

Here are the variables and their functions.

struct items_details
{
    char item_name[100];
    float item_price;
    int item_quantity;
};

struct order_details
{
    char customer_name[100];
    int no_of_items;
    struct items_details items_details[100];
    int total;
    int net_total;
};

struct order_details order[100];

struct order_details order_read;

Then we will declare them with their variables.

void delay(int number_of_seconds)
{
    int milli_seconds = 300 * number_of_seconds;
    clock_t start_time = clock();
    while (clock() < start_time + milli_seconds)
        ;
}

This code allows us to give a delay using the time library.

void generate_menu()
{
    system("cls");
    printf("1]Generate Bill\n");
    printf("2]Exit\n");
}

Now using this function we will generate a menu.

void generate_bill_head(int no_of_items, char name[100])
{
    printf("====================================BILL====================================\n");
    printf("Bill for :%s \n", name);
    printf("Date : ");
    printf(__DATE__);
    printf("\n");
    printf("----------------------------------------------------------------------------\n");
    printf("Item\t\t\tQuantity\t\tPrice\t\tTotal\n");
    printf("----------------------------------------------------------------------------\n");
}

In this code we will generate the Bill Head. It will have two parameters :

• no_of_items
• name (item name)

void generate_bill_body(char item_name[100], float price, int quantity)
{
    printf("%s\t\t\t%d\t\t\t%f\t%f\n", item_name, quantity, price, (quantity * price));
}

We can generate bill body using this function. It has three parameters :

• item_name
• price
• quantity

void generate_bill_foot(float total)
{
    printf("----------------------------------------------------------------------------\n");
    printf("Total\t\t\t\t\t\t\t\t%f\n", total);
    printf("Discount\t\t\t\t\t\t\t%f\n", (total * 10 / 100));
    printf("CGST\t\t\t\t\t\t\t\t%f\n", ((total - (total * 10 / 100)) * 9 / 100));
    printf("SGST\t\t\t\t\t\t\t\t%f\n", ((total - (total * 10 / 100)) * 9 / 100));
    printf("----------------------------------------------------------------------------\n");
    printf("Net Total\t\t\t\t\t\t\t%f\n", ((total - (total * 10 / 100)) + ((total - (total * 10 / 100)) * 18 / 100)));
    printf("----------------------------------------------------------------------------\n");
    printf("Thank you for visiting\n");
    order[order_no].net_total = total;
    order[order_no].net_total = ((total - (total * 10 / 100)) * 9 / 100);
}

In this function we will generate the bill foot. It will contain

• Total
• Discount
• GST
• Net Total

It has one parameter :

• total

int main()
{
    while (active)
    {
        generate_menu();
        printf("Enter your choice : ");
        scanf("%d", &choice);
        system("cls");

        switch (choice)
        {
        case 1:
            fgetc(stdin);
            printf("Enter name of customer : ");
            fgets(order[order_no].customer_name, 100, stdin);
            printf("Enter no of items : ");
            scanf("%d", &order[order_no].no_of_items);
            printf("\n");
            for (int i = 0; i < order[order_no].no_of_items; i++)
            {
                fgetc(stdin);

                printf("Enter item no %d name : ", (i + 1));
                fgets(order[order_no].items_details[i].item_name, 100, stdin);
                printf("Enter item no %d price : ", (i + 1));
                scanf("%f", &order[order_no].items_details[i].item_price);
                printf("Enter item no %d quantity : ", (i + 1));
                scanf("%d", &order[order_no].items_details[i].item_quantity);

                printf("\n\n");
                order[order_no].items_details[i].item_name[strlen(order[order_no].items_details[i].item_name) - 1] = '\0';
            }

            printf("Generating Bill");
            for (int i = 0; i < 5; i++)
            {
                delay(1);
                printf(".");
            }
            printf("\n");
            printf("\n");
            generate_bill_head(order[order_no].no_of_items, order[order_no].customer_name);
            printf("\n");

            for (int i = 0; i < order[order_no].no_of_items; i++)
            {
                total = total + (order[order_no].items_details[i].item_price * order[order_no].items_details[i].item_quantity);
                generate_bill_body(order[order_no].items_details[i].item_name, order[order_no].items_details[i].item_price, order[order_no].items_details[i].item_quantity);
            }

            generate_bill_foot(total);
            order[order_no].total = total;
            order[order_no].net_total = ((total - (total * 10 / 100)) * 9 / 100);

            printf("Enter 1 to Finish : ");
            scanf("%d", &choice);

            order_no++;

            break;

        case 2:
            printf("Exit\n");
            active = 0;
            break;
        default:
            printf("Exit\n");
            active = 0;
            break;
        }
    }
}

The code written in the main function is as follows:

• First we will create a while loop with argument ‘active’.
• Then we will generate the menu and ask the user for its choice.
• According to user’s choice we will switch using ‘switch’ statement with argument ‘choice’.
• If user enters ‘1’ them we will create a bill. For that first we will ask for his\her name and number of items.
• We will use a for loop, in it we will ask for item name, item price, item quantity. The loop will go on till ‘i‘(iterator) is not greater than or equal to no of items.
• Then we will generate the bill head using ‘generate_bill_head()’.
• We will run a for loop again and use ‘generate_bill_body()’. The loop will run till ‘i'(iterator) is not greater than or equal to no of items.
• Then we will generate the bill foot using ‘generate_bill_foot()’.
• The bill will be generated and displayed on the screen.
• Then we will ‘Enter 1 to finish’ to finish the bill generation process.  Then we will return back to menu.
• If the user enters ‘2’ then the program will exit.

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