Program 308: Store Contacts in Text file using C

Program 308: Store Contacts in Text file using C
 

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
int GetValidContactOrNot(char contact[]);
main()
{
 int choice,i,flag,j=1;
 char contact[10],name[20],storeContact[100];
 
 do{
  if(choice==1)
  {
      printf("Enter Name\n");
      fflush(stdin);
      gets(name);
      printf("Enter Mobile Number\n");
      fflush(stdin);
      gets(contact);
      flag=GetValidContactOrNot(contact);
      if(flag==1)
      {
       FILE *contactFile;
       contactFile=fopen("contactlist.txt","a");
       char c;
       if(contactFile==NULL)
                {
                   printf("Contact File Not Found\n");
                   exit(0);
                }
                else
                {
                 strcpy(storeContact,"Name    : ");
                 strcat(storeContact,name);
                 strcat(storeContact,"\n");
                 strcat(storeContact,"Contact : ");
                 strcat(storeContact,contact);
                 strcat(storeContact,"\n");
                 fputs(storeContact,contactFile);
                  fputs("----------------------------------------------------\n",contactFile);
                 printf("Contact has been added Successfully\n");
                }
                fclose(contactFile);
       }
      else
      {
       printf("Invalid Contact Number.It should contain only numbers and should have 10 digits\n");
      }
     }
     if(choice==2)
     {
      FILE *contactFile;
      contactFile=fopen("contactlist.txt","r");
      char c;
      while(1)
      {
       if(contactFile==NULL)
       {
        printf("Contact File Not Found\n");
       }
       else
       {
        c=fgetc(contactFile);
        if(c==EOF)
        break;
        printf("%c",c);
       }
      }
      fclose(contactFile);
        }
  printf("Press\n1 - Add Contact\n2 - View Contact List\nany other number to exit\n");
  scanf("%d",&choice);
  
 }while(choice==1 || choice==2);
}

int GetValidContactOrNot(char contact[])
{
 int i,flag;
 if(strlen(contact)==10)
  {
   flag=1;
   for(i=0;i<strlen(contact);i++)
   {
    if(!isdigit(contact[i]))
       flag=0;
   }
  }
  else
  {
   return(0);
  }
  return(flag);
}

Explanation:

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Output: