Question

In C Programming Language, write a command line argument(s) program. The line should have program_name.exe input_file1.txt “char_string”. The program should print an error message if there are not exactly three arguments on the line. input_file1.txt will have a word in it different than the “char_string”. The program will print on one line the char_string concatenated with input_file1.txt followed by the program name. Upon success print on new line, “Program finished!”

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
   int* arr1;
   int i = 0;
   char line[1000];
   FILE *fptr;
   if(argc == 3){
      if ((fptr = fopen(argv[1], "r")) == NULL)
      {
         printf("Error! opening file");
         exit(1);
      }
   
      printf("%s\n",argv[2]);
      while (fgets(line, sizeof line, fptr) != NULL) {
         printf("%s",line);
      }
      printf("Program finished!\n");
      fclose(fptr);
   }
   else{
      printf("Error: Please provide 3 command line arguments\n");
   }
   return 0;
}

Note: Please comment below if you have any doubts