How to do the option for Yes and No?

Hello. I’m new to C-programming. Can anyone help me out? I can’t find the code to solve this-

• Display a WELCOME MENU.
• Ask the user if they would like to continue. ‘Y’ to continue and ‘N’ to stop.
• As long as the choice is ‘Y’ then :

o Ask the user to enter the customer’s name.
o Ask the user to enter the weight of the groceries.

Code:

---


#include<stdio.h>
#include<string.h>
 

void main()

{
   
    char customer_name[30] , ans;
    float weight;
   
   
    printf("\n***********************************************");
    printf("\\n*        WELCOME TO THE GROCERIES SHOP            *");
    printf("\n***********************************************");
   
 
    printf("Would you like to continue (Y/N)?");
    scanf("%c", ans);
   
    if(ans == 'y' || ans == 'Y')
    {
    printf("\nEnter customer’s name: ");
    gets(customer_name);
    printf("\nEnter weight of groceries[KG]: ");
    scanf("f" ,&weight);
    }   
   
    else(ans == 'n' || ans == 'N');
    break;
  {
 
   
}

---

It depends on whether you want to require 'y', 'Y', 'n' and 'N' as valid input. Either way, you would use at least one loop.

use a while loop

Code:

---

  printf("Would you like to continue (Y/N)?");
  scanf("%c", &ans);

  while (ans == 'y' || ans == 'Y'){
    /*code to be repeted*/
   
    printf("Would you like to continue (Y/N)?");
    scanf("%c", &ans);
  }

---

edit:

also

Code:

---

    printf("\\n*        WELCOME TO THE GROCERIES SHOP            *");

---

will output

Code:

---

"\n*        WELCOME TO THE GROCERIES SHOP            *"

---

you have a extra '\'


(from post below mine)

Quote:

---

Originally Posted by itCbitC

scanf() requires pointers to the conversion format.

---

the '&' symbol in front of the variable (you used it inside the if statement but left it out when you asked for ans)

scanf() requires pointers to the conversion format.

scanf("%c"

will leave \n char in the buffer, which will be read by gets

you need to clear the buffer before reading string - read FAQ how

And while you'll be there - read why you should not use gets

And why you should not use void main

I cannot get gets() to work in while loop, any get arounds?

Quote:

---

Originally Posted by Vast87

I cannot get gets() to work in while loop, any get arounds?

---

do not use gets - use fgets

do not mix it with scanf

Code:

---

#include <stdio.h>

int main()
{
       
        int choice;
        char name[30];

        printf("Would you like to continue? Type 0 to stop or 1 to continue: ");
        scanf("%d", &choice);

        while(choice == 1)
        {
                printf("Enter customer name: ");
                gets(name);       
       
        fflush(stdin);
        printf("Would you like to continue? Type 0 to stop or 1 to continue: ");
        scanf("%d", &choice);
        }
        printf("Customer Name: %s", name);

getche();
}

---

How to enter customer name?

Code:

---

#include <stdio.h>

void myflush(void);

int main()
{
       
        int choice;
        char name[30];

        printf("Would you like to continue? Type 0 to stop or 1 to continue: ");
        ;

        while(scanf("%d", &choice) == 1 && choice == 1)
        {
                printf("Enter customer name: ");
                scanf(" %29[^\n]",name);       
                printf("Customer Name: <%s>\n", name);
                myflush(); /* if name is longer then buffer - need to get rid of the rest of chars */

                printf("Would you like to continue? Type 0 to stop or 1 to continue: ");
        }

}

void myflush(void)
{
        int c;
        while((c=getchar()) != EOF && c != '\n');
}

---

fflush for stdin undefined - read FAQ

Thank you for your help people. I think i manage to do the YES and NO.
but there is some questions -

1- how can i display total customer?
2- where should i put the fflush?

thank you again

Code:

---


#include<stdio.h>
#include<string.h>


void main()
{
    char customer_name[30], x, y, n, choice;
    float weight, price, payment, total =0;
   
   
   
        printf("\n********************************");
        printf("\n**  WELCOME TO GROCERIES SHOP  **");
        printf("\n********************************");
   
   
        x=1;
        while(x<=3)
        {
          printf("\nWould you like to continue [Y/N] : ");
          scanf("%c",&choice);
       
        while(choice=='y' || choice=='Y')
              {
                printf("\nEnter customer name: ");
                scanf("%s",&customer_name);
               
                printf("\nEnter weight [KG]    :  ");
                scanf("%f",&weight);
               
       
                printf("\n-------------------------------");
                printf("\n-    BILLING RECEIPT        -");
                printf("\n-------------------------------");
               
                printf("\nCustomer name    :%s",&customer_name);
                printf("\nLaundy weight [KG]:%.2f",weight);
               
                  //nested if
                 
              if (weight<=3.0)
                    {
                    printf("\nPrice equals to :$ 1.20");
                    price==1.20;
                    }
             
              else if (weight>3.0 && weight<6.0)
                    {
                    printf("\nPrice equals to :$ 1.00");
                    price==1.00;
                    }
                   
                else
                    {
                    printf("\nPrice equals to  :$ 0.80");
                    price==0.80;
                    }
                 
                               
                  payment = price * weight;
                 
                  printf("\n-------------------------------");
                  printf("\n-    TODAY'S SUMMARY          -");
                  printf("\n-------------------------------");
                  printf("\nPayment :%.2f"); //why can't i put ,payment at the end?
                  //How can i display Total Customer?
           
                printf("\nWould you like to continue [Y/N] : ");
                scanf("%c",&choice);
                 
             
                 
              x++ ;
                }
             
               
                    printf("\n----------------------------");
                    printf("\n-      Thank you          -");
                    printf("\n----------------------------");
                 
             
             
             
        }
        getch();
   
}

---

Quote:

---

Originally Posted by karipap

Thank you for your help people. I think i manage to do the YES and NO.
but there is some questions -

1- how can i display total customer?
2- where should i put the fflush?

thank you again

---

What is the purpose of the variable x?

The customer can continue to shop as long as they want, right?

We need a touch up, here.

I would change it to something like this:

Code:

---


#include<stdio.h>
#include<string.h>


int main()
{
    char customer_name[30], x, y, n, choice;
    float weight, price, payment, total =0;
   
   
    do
          {
   
          printf("\n********************************");
          printf("\n**  WELCOME TO GROCERIES SHOP  **");
          printf("\n********************************");
   
   
          printf("\nEnter customer name: ");
          scanf(" %s",&customer_name);
           
          printf("\nEnter weight [KG]    :  ");
          scanf(" %f",&weight);
               
       
          printf("\n-------------------------------");
          printf("\n-    BILLING RECEIPT        -");
          printf("\n-------------------------------");
               
          printf("\nCustomer name    :%s", customer_name);
          printf("\nLaundy weight [KG]:%.2f",weight);
               
          //nested if
                 
          if (weight<=3.0)
            {
            printf("\nPrice equals to :$ 1.20");
            price==1.20;
            }
             
          else if (weight>3.0 && weight<6.0)
            {
            printf("\nPrice equals to :$ 1.00");
            price==1.00;
            }
                   
          else
            {
            printf("\nPrice equals to  :$ 0.80");
            price==0.80;
            }
                 
          payment = price * weight;
          total += payment;
          payment = 0;
                 
           
          printf("\nWould you like to continue [Y/N] : ");
          scanf(" %c",&choice);
    }while(choice=='y' || choice=='Y')
 
    printf("\n-------------------------------");
    printf("\n-    TODAY'S SUMMARY          -");
    printf("\n-------------------------------");
    printf("\nTotal:%.2f" total);
               
    printf("\n----------------------------");
    printf("\n-      Thank you          -");
    printf("\n----------------------------");
                 
             
    getch();
    return 0;
}

---

You are right Adak. I think the variable x should be out. I did it base on the output example that shown only 3 customers.

I noticed there's something wrong -
The 'Thank You' will appear 2 times.

and also there is no condition for 'N==NO'

What would no mean, to a customer? Early exit before going through the do loop?

My "Thank You" is outside the do while loop. You will only see it once.

Oh yeah. No fflush is needed in this version. :)

Adak - The Yes No at the start is to ask and check whether there is any customer at that time. Thank you Adak for helping me out!

This is the latest code i've been working on. Everything looks ok, but if the user enter name that have 2 or more such as - Jackie Chan or Edward Scissor Hands , the Weight per [KG] will be skip.

No problem for single name such as Jack, Donald, Fatimah.

How can i fix this?

thank you

Code:

---

#include<stdio.h>
#include<string.h>


void main()
{
    char customer_name[30], y, n, choice;
    float weight, price, payment, total=0;
    int customer=0;
   
        printf("\n******************************************");
        printf("\n**        WELCOME TO GROCERIES SHOP      **");
        printf("\n******************************************");
       
       
        printf("\nWould you like to continue? [Y/N]:  ");
        scanf("%c",&choice); 
       
        while(choice=='y' || choice=='Y')
       
          {
             
        printf("\nEnter customer name              :  ");
        scanf("%s",&customer_name);
        printf("\nEnter weight [KG]                :  ");
        scanf("%f",&weight);
               
       
        printf("\n------------------------------------------");
        printf("\n-            BILLING RECEIPT            -");
        printf("\n------------------------------------------");
               
        printf("\nCustomer name                    : %s  ",&customer_name);
        printf("\nLaundy weight [KG]              : %.2f",weight);
               
                             
        //nested if
                 
        if (weight<=3.0)
        {
        printf("\nPrice per [KG]                  :$ 1.20");
        price=1.20;
        }
             
        else if (weight>3.0 && weight<6.0)
        {
        printf("\nPrice per [KG]                  :$ 1.00");
        price=1.00;
        }
                   
        else
        {
        printf("\nPrice per [KG]                  :$ 0.80");
        price=0.80;
        }
                 
        payment = price*weight;
        total = total + payment;
       
        printf("\nPayment                          :$ %.2f ",total);
                     
       
       
        fflush(stdin);
        printf("\nWould you like to continue [Y/N] : ");
        scanf("%c",&choice);
       
        customer++;
       
               
       
      }
        printf("\n------------------------------------------");
        printf("\n-            TODAY'S SUMMARY            -");
        printf("\n------------------------------------------");
        printf("\nTotal Payment  :$ %.2f " ,total);
        printf("\nTotal Customer : %d  " ,customer);
               
        printf("\n------------------------------------------");
        printf("\n-              THANK YOU                -");
        printf("\n------------------------------------------");
                 
             
      getch();
   
}

---

you are wrong about
scanf("%s",&customer_name);

it has problems itself even with the single word names - & should be lost

the fix for reading till the end of line instead of till the first whitespace is easy:

scanf("%29[^\n]",customer_name);

I have added the 29 - width specifier to avoid buffer overrun on very long names

in this case you will need to skip the rest of the line for next read to succed

Do u mean like this?
It skips the name ?

Code:

---

printf("\nEnter customer name              :  ");
scanf("%29[^\n]",customer_name);
printf("\nEnter weight [KG]                :  ");
scanf("%f",&weight);

---

try this
scanf(" %29[^\n]",customer_name);
to skip \n char left by the previous scanf

Thanks Vart!
now its all ok!