Command line arguments – Theory and Programs [Learn to code]

What are Command line arguments? Learn syntax for using Command line arguments, programs on Command line arguments.

• 101. Write a program accept a file name from user and print content of that file

  #include<stdio.h>
  int main(int argc, char *argv)
  {
      if ( argc != 2 ){
           printf( "usage: %s filename", argv );
      }
      else 
      {
          FILE *file = fopen( argv, "r" );
  
          if(file == NULL)
               printf("Could not open file\n");
          else 
          {
              int x;
              while((x=fgetc(file)) != EOF)
                   printf( "%c", x );
              fclose( file );
          }
      }
  }