Program to write file in C

Algorithm

Let's first see what should be the step-by-step procedure to compare two integers−

START
      
   Step 1 → Take two integer variables, say A & B
          
   Step 2 → Assign values to variables

   Step 3 → Compare variables if A is greater than B
   
   Step 4 → If true print A is greater than B
   
   Step 5 → If false print A is not greater than B

STOP

Flow Diagram

We can draw a flow diagram for this program as given below −

Pseudocode

Let's now see the pseudocode of this algorithm −

procedure compare(A, B)

   IF A is greater than B
      DISPLAY "A is greater than B"
   ELSE
      DISPLAY "A is not greater than B"
   END IF
      
end procedure

Implementation

Now, we shall see the actual implementation of the program −

#include <stdio.h>
 
int main()
{
   FILE *fp;
   char *filename = "sample.txt";
   char *content = "Hey there!  You've successfully created a file with content in c programming language.";

   /*  open for writing */
   fp = fopen(filename, "w");

   if( fp == NULL )
   {
      printf("%s: failed to open. \n", filename);
      return -1;
   }
   else
   {
      printf("%s: opened in write mode.\n", filename);
   }

   /* Write content to file */
   fprintf(fp, "%s\n", content);

   if( !fclose(fp) )
      printf("%s: closed successfully.\n", filename);

   return 0;
}

Output

Output of this program should be −

sample.txt: opened in write mode.
sample.txt: closed successfully.