1 00:00:01,160 --> 00:00:01,790 Hi everyone. 2 00:00:01,790 --> 00:00:06,660 So in this lesson we are going to write the code for writing data to a fight. 3 00:00:06,840 --> 00:00:08,450 So let's see. 4 00:00:08,480 --> 00:00:10,290 So this is my folder. 5 00:00:10,640 --> 00:00:11,350 File handling. 6 00:00:11,360 --> 00:00:12,590 And this is my file. 7 00:00:12,620 --> 00:00:14,670 So writing into a file guard CBP. 8 00:00:14,720 --> 00:00:17,260 So that does open this filing. 9 00:00:17,330 --> 00:00:23,000 So this is the file now for writing data to a file first of all we have to include a File f a stream 10 00:00:24,340 --> 00:00:27,900 so f stream is filed stream. 11 00:00:27,910 --> 00:00:32,700 So now we have to create an object. 12 00:00:32,740 --> 00:00:40,290 So what is the name of the class output file stream and let's add the name of the objectives or office 13 00:00:41,010 --> 00:00:41,880 and what do you have to do. 14 00:00:41,880 --> 00:00:47,730 So you have to call the constructor for cutting the constructor to the name of the file is my file not 15 00:00:47,820 --> 00:00:58,890 the 60 and the second bedroom it is optional so you can give us truncate or you can give us append so 16 00:00:58,890 --> 00:01:00,330 truncate this by default. 17 00:01:00,330 --> 00:01:02,780 So let's leave truncate only. 18 00:01:02,880 --> 00:01:06,530 So I want to truncate to basically file doesn't even exist. 19 00:01:07,930 --> 00:01:14,450 Now let's say I want to insert some data so office let's say I want to insert that data off a student 20 00:01:14,480 --> 00:01:22,170 so that any of the student is Brock Lesnar or you can simply say Brock let's say I want to insert the 21 00:01:22,170 --> 00:01:23,250 roll number of Brock. 22 00:01:23,310 --> 00:01:24,680 So the roll number is 30. 23 00:01:24,690 --> 00:01:31,930 For example and let's say that gives a computer science student to the branch of CSC 24 00:01:39,910 --> 00:01:42,430 So initially this file might find out the 60. 25 00:01:42,460 --> 00:01:43,420 You can see. 26 00:01:43,420 --> 00:01:49,410 So this four lays empty this full list containing only one file so this file my file not the excuse 27 00:01:49,430 --> 00:01:50,220 does not exist. 28 00:01:50,340 --> 00:01:52,230 So if I will run this code what will happen. 29 00:01:52,240 --> 00:01:57,270 It will create this file and it will open that file and then it will insert the new time block today 30 00:01:57,300 --> 00:01:58,590 and CSC. 31 00:01:58,590 --> 00:02:00,030 So we'll let us know what program 32 00:02:03,750 --> 00:02:05,190 so we are not printing anything. 33 00:02:05,190 --> 00:02:07,110 So that's why the output is empty. 34 00:02:07,140 --> 00:02:10,590 And now let's see what is the situation of our folder. 35 00:02:10,710 --> 00:02:13,010 So my folders containing these two files. 36 00:02:13,320 --> 00:02:16,580 And this is the file that our program has created. 37 00:02:16,590 --> 00:02:18,150 This file was not present earlier. 38 00:02:18,510 --> 00:02:22,790 So now let us open this file and this is the data that we inserted. 39 00:02:22,810 --> 00:02:32,780 BLOCK The NCIC simple nullity what I want to do so let us insert some data here. 40 00:02:32,800 --> 00:02:39,820 So for example this wireless already containing some data hello world and let's say ABC be anything 41 00:02:40,420 --> 00:02:41,240 and let's say 42 00:02:44,170 --> 00:02:48,050 Okay so this is the situation of my file no. 43 00:02:48,070 --> 00:02:48,300 Okay. 44 00:02:48,310 --> 00:02:54,880 So this is the situation of my file no save. 45 00:02:54,960 --> 00:02:56,080 Now what I want to do. 46 00:02:56,160 --> 00:02:58,160 So I do not want to lose my data. 47 00:02:58,170 --> 00:03:01,430 So now this time you will and deprogram my file already exist. 48 00:03:01,530 --> 00:03:03,420 But this time I do not want to lose my data. 49 00:03:03,450 --> 00:03:10,960 So what I will do I will use append and now if you will insert this data. 50 00:03:10,990 --> 00:03:14,270 So this data will now be inserted in this file. 51 00:03:14,320 --> 00:03:18,130 So this time this file already exists and it is containing some data. 52 00:03:18,280 --> 00:03:22,220 And I want to insert my new data after that data. 53 00:03:22,230 --> 00:03:28,340 So I am using append so this data will get appended inside my file. 54 00:03:28,460 --> 00:03:30,900 So let's turn our program. 55 00:03:30,910 --> 00:03:31,120 Okay. 56 00:03:31,130 --> 00:03:33,640 So let's change the name so that you can understand. 57 00:03:33,640 --> 00:03:34,910 So the name is list not 58 00:03:37,670 --> 00:03:38,230 selectee 59 00:03:40,900 --> 00:03:44,350 so again now what output screen is empty because we are not printing anything. 60 00:03:45,070 --> 00:03:46,880 Now let's see our fault again. 61 00:03:46,900 --> 00:03:48,870 So this time the file already exists. 62 00:03:48,880 --> 00:03:50,290 So it would not create new file. 63 00:03:50,290 --> 00:03:55,270 Now let us open this file so this was our original data. 64 00:03:55,480 --> 00:04:00,850 And now this is the data that we inserted using our program. 65 00:04:00,850 --> 00:04:07,690 Now one thing that V4 got to do is basically after writing our program after doing all the work you 66 00:04:07,690 --> 00:04:09,900 have to call the function close. 67 00:04:10,000 --> 00:04:16,310 So if it's not close so clauses in big function of output files stained glass. 68 00:04:16,390 --> 00:04:17,890 So this is very important. 69 00:04:17,950 --> 00:04:19,410 You have to call this function. 70 00:04:19,480 --> 00:04:26,450 And so very good practice so I hope you know now how to write it down to a file. 71 00:04:26,520 --> 00:04:29,520 So in the next video we will learn how to read data from a file. 72 00:04:29,880 --> 00:04:31,920 So I will see you in the next video by.