Noob Data Engineer

In this tutorial, we are working with the files in the C. File handling in any language requires Three main steps to follow Open the file in Read/Write mode. Do various operation that you want to do. Close the file. We are using fopen(file stream). there is some modes to open a file. Read mode  opens file into the read mode if file not found returns -1. Write mode opens file into the write mode if the file does not present creates a new file if there is previous data it will be overwritten. Append mode opens the file in the append mode and append data to it Without wasting much time lets start working. Create a New C file of whatever name you want mine is files.c. create the basic schema of C language. #include <stdio.h> int main(int argc, char const *argv[]) { /* code */ return 0; } Read From the file Create a FILE pointer to point a stream and open a file into the read mode using "r". you may need to include the string.h to your headers. the data of the file is #in

Pointers in C A pointer is a variable which contains the address of the variable specified. for example:  int x = 100; int *data; data = &x; this variable data contains the address of the block in the memory which contains the value 100. * specifies that this is the pointer variable. & gives the address. that is the what I am doing here assigning the address of the integer variable x to the pointer variable data. to get the data from the pointers we have to use the * sign. for the previous example to get the data of the memory block of the printf("%d\n",*data );  this should print the output like the image. Further digging into deep for the pointers. we can use them for the array. if we change content in the memory block pointed by the data, then this change should reflect the in the content of the x. Because variable x has the content of that memory block. (this is the great advantage of the using the pointers) we can read, change anything without copying the data fr