#include <stdio.h>
#include <stdlib.h>

#include <ctype.h>

void gotoxy(int column, int line);
int main();
int addProduct();
int displayProduct(); //prototype

struct product {
    int quantity, reorder, i, id;
    char name[20];
    float price;
};

COORD coord = { 0, 0 };

void gotoxy(int x, int y) {
    coord.X = x; coord.Y = y;

    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

int main() {
    int choice;

    gotoxy(17, 5);
    printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2 SYZ INVENTORY PROGRAM \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

    gotoxy(17, 20);
        printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

    gotoxy(22, 8);
    printf("1. Add Product\n\n");

    gotoxy(22, 10);
    printf("2. Display Product\n\n");

    gotoxy(22, 12);
    printf("3. Search Product\n\n");

    gotoxy(22, 14);
    printf("4. Reorder Level of Product\n\n");

    gotoxy(22, 16);
    printf("5. Update Product\n\n");

    gotoxy(22, 18);
    printf("6. Exit\n\n");

    gotoxy(22, 22);
    printf("Please Enter Your Choice : ");
    scanf(" %d", &choice);

    switch (choice) {
      case 1:
        addProduct();
        break;
      case 2:
        displayProduct();
        break;
      case 3:
        searchProduct();
        break;
      case 4:
        reorderProduct();
        break;
      case 5:
        updateProduct();
        break;
      case 6:
        break;
      default:
        system("cls");
        main();
    }
    return (0);
}

/*MENU CODE ENDS !*/

int addProduct() {
    FILE *fp;

    int i = 0;
    struct product a;
    system("cls");

    fp = fopen("inventory.txt", "a+t");

    char checker;

    do {
        system("cls");

        gotoxy(17, 5);
        printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2 SYZ INVENTORY PROGRAM \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

        gotoxy(17, 20);
        printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

        gotoxy(22, 8);
        printf("Enter product ID : ");
        scanf(" %d", &a.id);

        gotoxy(22, 10);
        printf("Enter product name : ");
        scanf(" %s", a.name);

        gotoxy(22, 12);
        printf("Enter product quantity : ");
        scanf(" %d", &a.quantity);

        gotoxy(22, 14);
        printf("Enter product price : ");
        scanf(" %f", &a.price);

        gotoxy(22, 17);
        fprintf(fp, "%d %s %d %f\n\n", a.id, a.name, a.quantity, a.price); //SAVE TO TXT FILE LINE !
        printf("Record saved!\n\n");

        fclose(fp);

        gotoxy(22, 22);
        printf("Do you want to enter new product? Y / N : ");

        scanf(" %c", &checker);
        checker = toupper(checker);

        i++;

        system("cls");
    } while (checker=='Y');

    if (checker == 'N') {
        main();
    } else {
        do {
            system("cls");

            gotoxy(17, 5);
            printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2 SYZ INVENTORY PROGRAM \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

            gotoxy(17, 20);
            printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

            gotoxy(18, 8);
            printf(">>> Wrong Input! Please Enter Y Or N Only! <<<");

            gotoxy(19, 12);
            printf("Do You Want To Enter New Product? Y / N : ");
            scanf(" %c", &checker);
            checker = toupper(checker);
        } while (checker != 'Y' && checker != 'N');

        if (checker == 'Y'){
            addProduct();
        }

        if (checker == 'N') {
            system("cls");
            main();
        }
    }
    return(0);
}

/*ADD PRODUCT LINE ENDS !*/

int displayProduct() {
    FILE *fp;
    struct product a;

    char true;
    system("cls");

    fp = fopen("inventory.txt", "r");

    gotoxy(17, 5);
    printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2 SYZ INVENTORY PROGRAM \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

    gotoxy(5, 6);
    printf("======================================================================");

    gotoxy(5, 7);
    printf("Product ID\t\t Product Name\t\t Quantity\t Unit Price\n"); //TABLE TITLES !

    gotoxy(5, 8);
    printf("======================================================================");

    gotoxy(5,10);
    while (fscanf(fp, "%d %s %d %f", &a.id, a.name, &a.quantity, &a.price) == 4) {
        printf("%d\t\t\t %s\t\t\t %d\t\t %.2f\n\n", a.id, a.name, a.quantity, a.price); //PRINT FROM TXT FILE TO COMMAND PROMPT.
    }
    fclose(fp);

    printf("\t\t \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2");

    printf("\nPress any key to return to Main Menu.");

    getch();

    int main();

    return (0);
} 

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#include <stdio.h>
int main()
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    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
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About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}  

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition); 

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}