Parameters of an objective-C program and Main Function

# Import <Foundation/Foundation. h> Int Main ( Int Argc, Char * Argv []) {  If (Argc = 1  ) {Nslog (  @"  You need to provide a file name  "  );  Return   1 ;} File * File = fopen (argv [ 1 ], "  R  "  );  Char Words [ 100  ];  While (Fgets (words, 100  , File) {words [strlen (words) - 1 ] = '  \ 0 '  ; Nslog (  @"  % S is % d character long  "  , Words, strlen (words);} fclose (File );  Return   0  ;} 

 

Argc is the number of parameters, and argv is the parameter value:

For exampleProgramEnter:

./Main.exe words.txt

 

If argc = 1, only./main.exe is input, and the file name is missing.

The name of the stored program in argv [0] (./main.exe );

The file name (words.txt) is saved in argv1_1second ).