Product Management Software using Structure in C.

#include <stdio.h>

#include<string.h>

struct product

{

    char name[100];

    int id;

    int price;

    char discription[100];

    int discount;

    int total_price;

};

struct product p[100];

int index=0;

int menu()

{

    printf("Press 1 to Show All product
");

    printf("press 2 to Add Product
");

    printf("Press 3 to Delete Product
");

    printf("Press 4 to Search a product
");

    printf("Press 5 to count all  product
");

    printf("Press 10 to Exit
");

}

int showallproduct()

{

    int i=0;

    FILE *fp;

    fp=fopen("showallproduct.txt","w");

    if(index==0)

    {

        printf("No Data
");

    }

    else

    {

        for(i=0; i<index; i++)

        {

            fprintf(fp,"Name: %s
",p[i].name);

            fprintf(fp,"ID: %d
",p[i].id);

            fprintf(fp,"product Price: %d
",p[index].price);

            fprintf(fp,"Description: %s
",p[i].discription);

            fprintf(fp,"discount: %d
",p[index].discount);

            fprintf(fp,"Total Balance: %d
",p[index].total_price);

        }

    }

    return 0;

}

int addproduct()

{

    int i=0,j;

    int flag =0;

    printf("Please Enter The Product name: 
");

    fflush(stdin);

    gets(p[index].name);

    while(p[index].name[i] != '')

    {

        if(p[index].name[0]>=97 && p[index].name[0]<=122)

        {

            p[index].name[0]=p[index].name[0]-32;

        }

        i++;

    }

    printf("Please Enter The product id: 
");

    scanf("%d",&p[index].id);

    int q=0;

    while(p[index].id%10!=0)

    {

        q++;

        if(q-1<9 || q-1>9)

        {

            printf("Please Enter The product id: 
");

            scanf("%d",&p[index].id);

            break;

        }

    }

    printf("Please Enter The product Price:
");

    scanf("%d",&p[index].price);

    printf("Please Enter Description: 
");

    fflush(stdin);

    gets(p[index].discription);

    printf("Please Enter The the discount:");

    scanf("%d",&p[index].discount);

    p[index].total_price=(p[index]. price-p[index].discount);

    index++;

    return 0;

}

int deleteproduct()

{

    int i,j,n;

    int a;

    printf("Please Enter The Product Code Which You Want To Delete: 
");

    scanf("%d",&a);

    for(i=0; i<index; i++)

    {

        if(p[i].id==a)

        {

            for(j=i; j<index; i++,j++)

            {

                p[i]=p[i+1];

            }

            index--;

        }

    }

    return 0;

}

int  search()

{

    int a,i;

    printf("Please Enter The product ID you want to search:
");

    scanf("%d",&a);

    for(i=0; i<index; i++)

    {

        if(p[i].id==a)

        {

            printf("Name: %s
",p[i].name);

            printf("ID: %d
",p[i].id);

            printf("product Price: %d
",p[index].price);

            printf("Description: %s
",p[i].discription);

            printf("discount: %d
",p[index].discount);

            printf("Total Balance: %d
",p[index].total_price);

        }

    }

    return 0;

}

int countproduct()

{

    int n,i;

    FILE *fp;

    fp=fopen("Count.txt","w");

    fprintf(fp,"Total Product: %d 
",index);

    fclose(fp);

    return 0;

}

int main()

{

    printf("!!!!!!!! search()!!!Welcome!!!!!!!
");

    int n;

    while(1)

    {

        menu();

        printf("Please Enter your choice: 
");

        scanf("%d",&n);

        if(n==1)

        {

            showallproduct();

        }

        if(n==2)

        {

            addproduct();

        }

        if(n==3)

        {

            deleteproduct();

        }

        if(n==4)

        {

            search();

        }

        if(n==5)

        {

            countproduct();

        }

        if(n==10)

        {

            printf("
Good Bye
");

            break;

        }

    }

    return 0;

}