Question

//Done in C please!

//Any help appreciated!

Write two programs to write and read from file the age and first and last names of people. The programs should work as follows:

1. The first program reads strings containing first and last names and saves them in a text file (this should be done with the fprintf function). The program should take the name of the file as a command line argument. The loop ends when the user enters 0, the program should function as follows (items in italics to be entered by user):

This program reads and saves ages and names in a binary file.

Enter person (age, first last):40, John Smith

Enter person (age, first last):32, Bill Jones

Enter person (age, first last):0

2. The second program reads in from the text file above (with the fscanf function) and prints out the ages and names on the screen. The program should take the name of the file as a command line argument. The program should function as follows (items in italics to be entered by user):

This program prints ages and names from a text file.

Name: 40, John Smith

Name: 32, Bill Jones

Algorithm design process

1. First program:

a. Declare needed variables.

b. Use command line arguments to open the file specified by the user for writing.

c. Enter the prompt and read the information from the user.

d. In a loop (until the user enters 0)

    i. Use scanf to read age, first name, last name

      ii. Use fprintf to write age, first name, last name to the file

e. Close the file.

2. Second program:

a. Declare needed variables (to store age, name string).

b. Use command line arguments to open the file specified by the user for reading.

c. In a loop until reaching the end of the file (EOF)

               i. Use fscanf to read age, first name, last name

               ii. If fscanf returns an integer not equal to 3, break the loop

              iii. Print the information on the screen.

d. Close the file.

Write two programs to write and read from file the age and first and last names of people. The programs should work as follows: 1. The first program reads strings containing first and last names and saves them in a text file (this should be done with the fprintf function). The program should take the name of the file as a command line argument. The loop ends when the user enters 0 e This program reads and saves ages and names in a binary file Enter person (age, first last) :40, John Smith Enter person (age, First last) :32, Bill Jones Enter person (age, first last):0 nre, Eirat last):3 The second program reads in from the text file above (with the fscanf function) and prints out the ages and names on the screen. The program should take the name of the file as a command line argument. 2. This program prints ages and names from a text file Name 40, John Smith Name: 32, Bill Jones Algorithm design process 1. First program: a. Declare needed variables. b. Use command line arguments to open the file specified by the user for writing. c. Enter the prompt and read the information from the user d. In a loop (until the user enters 0) i. Use scanf to read age, first name, last name ii. Use fprintf to write age, first name, last name to the file Close the file. e. 2. Second program: Declare needed variables (to store age, name string). Use command line arguments to open the file specified by the user for reading. In a loop until reaching the end of the file (EOF) i. Use fscanf to read age, first name, last name ii. If fscanf returns an integer not equal to 3, break the loop ii. Print the information on the screen. a. b. c. d. Close the file

Answer 1

1)

/*
C program that promts user to enter age,
fist name, last name and then write the data
to binary file, person_data.txt*/
//include header files
#include<stdio.h>
#include<string>
#include<conio.h>
//Person structure
struct Person
{
   int age;
   char fname[20];
   char lname[20];

};
int main()
{

   int index=0;
   char comma;
   int age;
   char firstName[20];
   char lastName[20];
   struct Person person;

   printf("This program reads and saves ages and names in a binary file.\n");
   //Prompt user to enter age ,first and last names and write to file
   //in binary mode
   FILE* outFile=fopen("person_data.dat", "wb");
   printf("Enter person (age, first last):");
   scanf("%d",&age);
  
   while(age!=0)
   {
       scanf("%c%s%s",&comma,&firstName,&lastName);
       person.age=age;
       strcpy(person.fname,firstName);
       strcpy(person.lname,lastName);
       //write to file
       fwrite (&person, sizeof(struct Person), 1, outFile);
       printf("Enter person (age, first last):");
       scanf("%d",&age);
   }

   //close the file object
   fclose(outFile);

  
   getch();
   return 0;
  
}

Sample Ouptut:

his program reads and saves ages and names in a binary file Enter person (age, first last):40, John Smith Enter person (age, first last):32, Bill Jones Enter person (age, first last):e

-------------------------------------------------------------------------------------------------------------------------------------------

2)

/**
C program that read an input file person_data.txt file
and then print the Person age, name on console output.
*/
//include header files
#include<stdio.h>
#include<string>
#include<conio.h>
//Person structure
struct Person
{
   int age;
   char fname[20];
   char lname[20];

};
int main()
{
   char comma;
   int age;
   char firstName[20];
   char lastName[20];
   struct Person person;
   FILE *infile;   

   // Open person_data.dat for reading
   infile = fopen ("person_data.dat", "r");
   if (infile == NULL)
   {
       fprintf(stderr, "\nError opening file\n");
       exit (1);
   }

   printf("This program prints age and names from a text file.\n");
   // read file contents till end of file
   while(fread(&person, sizeof(struct Person), 1, infile))
       printf ("Name = %d, %s %s\n", person.age,person.fname, person.lname);

   getch();
   return 0;
}

Sample Output:

is program prints age and names from a text file. Name 40, John Smith Name = 32, Bill Jones Th

Note :Do not open person_data.dat since it is in binary format.Not user readble format.