Question

In this lab, you will write a program that will read a canonical phone number form the user, then prints it back to the properly formatted in the for “xxx-xxxx”. You program must achieve the following requirements: 1. If the user enters the number “0”, the program should exit immediately. 2. If the user enters any phone number that is grater than or less than 7-digits, the program should report an error back. In other words, only valid 7-digit numbers are accepted, so entering an 8-digits number or 5-digits number for example should trigger an error message. 3. If the users enters an invalid phone number, then the program should report the error to the user. Hint: central office code doesn’t start with “0” or “1”. 4. If the user enters a valid 7-digit numbers, then the program should format the phone number in a hyphenated 7-digit representation, i.e, “7274723” will become “727-4723”. 5. Bonus: You get 2 bonus marks if the program continue looping infinitely until the user explicitly enters “0”.

i need a c langeuage code

Answer 1

Thanks for the question.

Below is the code you will be needing Let me know if you have any doubts or if you need anything to change.

Thank You !!

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

int digitCount(char phone_number[]){
  
   int i=0;
   int digits=0;
   while(phone_number[i]!='\0'){
      
       char letter = phone_number[i];
       if('0'<=letter && letter<='9')digits++;
       i++;
   }
   return digits;
}

void printFormatttedPhoneNumber(char phone_number[]){
  
  
   int i=0;
   int digits=0;
   printf("Formatted phone number: ");
   while(phone_number[i]!='\0'){
      
       char letter = phone_number[i];
       if('0'<=letter && letter<='9'){
           digits++;
           if(digits==4)printf("-%c",letter);
           else printf("%c",letter);
       }
       i++;
   }
   printf("\n");
  
  
  
}

int main(){
  
   char phone_number[20];
   int digits=0;
   while(1){
       printf("Enter the phone number: ");
       scanf("%19s",phone_number);
       if(strcmp(phone_number,"0")==0)break;
       digits=digitCount(phone_number);
       if(digits==7){
           printFormatttedPhoneNumber(phone_number);
       }else{
           printf("ERROR.The phone number is not correct.\n");
       }
   }
  
}

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