Question

I/O program for C

Write a program in direct1.c which reads from standard input a line and then outputs that line immediately to standard output. it should read the first line only !

Then, write another program called direct2.c which reads from standard input every line until end of input and outputs them to standard output. Everything that goes in should come out exactly as it was.

Compile both programs and run them on the input files given below

The direct1 program should be run, redirecting input1.txt to standard input and redirecting output to output1.txt.

The direct2 program should be run, redirecting input2.txt to standard input and redirecting output to output2.txt.

Please write two programs direct1.c and direct2.c

Contents of Input1.txt
Hi what is your name.

What What what What what

Contents of Input2.txt

The quick brown fox jumps over the lazy dog
​The lazy dog jumps over the quick brown fox.

So , output1.txt should display- Hi what is your name, (not all the whats below that)

​On output2.txt , it should display

The quick brown fox jumps over the lazy dog
​The lazy dog jumps over the quick brown fox.​ (Entire document until end of line)

Please also write linux command for I/O redirection as mentioned in question . If you know only though .

Answer 1

/**The sample c++ that prompts user to enter
a text until user press a enter key and print
the text to console.*/
//code.cpp
#include<stdio.h>
#include<conio.h>
#define MAX 255
int main()
{
   char letters[MAX]={0};
int i = 0, c;
   FILE *file;
   file=fopen("output1.txt","w");
printf ("Enter a line and press Enter key: ");
   /*Read text from user until user press enter*/
while (i + 1 < MAX && (c = getchar()) != '\n')
letters[i++] = c;
   //terminate the letters last char with null
letters[i] = '\0';   

printf ("String entered: %s\n", letters);
   //write the letters to console
   fprintf (file,"%s", letters);

   //close the file
   fclose(file);

   //pause program output on console
   getch();
return 0;
}

Sample Ouptut :

outputl.txt x sample.cpp Hi what is your name.

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

/**The sample c++ that prompts user to enter
a text until user press . to stop reading input
and then text
write to output2.txt .*/
//code.cpp
#include<stdio.h>
#include<conio.h>
#define MAX 1024
int main()
{
   char letters[MAX]={0};
int i = 0, c;
   FILE *file;
   file=fopen("output2.txt","w");
printf ("Enter a line and press Enter . to stop: ");
   /*Read text from user until user press cntl+Z from keyboard*/
while (i< MAX && (c = getchar()) != '.')
letters[i++] = c;
   //terminate the letters last char with null
letters[i] = '\0';   

printf ("String entered: %s\n", letters);
   //write the letters to console
   fprintf (file,"%s", letters);

   //close the file
   fclose(file);

   //pause program output on console
   getch();
return 0;
}

Sample Output :

Enter a line and press Enter . to stop: The quick brown fox jumps over the lazy dog String entered: The quick brown fox jumps over the lazy dog The lazy dog jumps over the quick brown fox

output2.txt X The quick brown fox jumps over the lazy dog The lazy dog jumps over the quick brown fox