Progra to check if file exists

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>
#include <sys/stat.h>
 
int main()
{
    FILE *fp;
    struct stat st;
    char *filename = "sample.txt";
    int flag;
    
    flag = stat(filename, &st);
 
    if(!flag)
        printf("File exists.");
    else
        printf("File does not exist.");

   return 0;
}

Output

Output of this program should be −

File does not exist.