Computing Commands in CLS
In computing, CLS (for clear screen) is a command used by the command-line interpreters on various operating systems to clear the screen or console window of commands and any output generated by them.
- CLS: This command is used to clear the screen or wipe out everything written on the screen.
File Related Commands in C Programming
-
fread and fwrite: The functions fread and fwrite are used for reading/writing data from/to the file opened by the fopen function. These functions accept three arguments. In case of success, fread/fwrite return the number of bytes actually read/written from/to the stream opened by fopen function.
-
fseek and ftell in C:
- ftell(): Used to store the current file position.
- fseek(): Used to relocate to one of the following:
- A file position stored by ftell()
- A calculated record number (SEEK_SET)
- A position relative to the current position (SEEK_CUR)
Examples of File Manipulation in C Programming
Example of feof with fread
The following example shows the usage of feof() function.
#include <stdio.h>
int main () {
FILE *fp;
int c;
fp = fopen("file.txt","r");
if(fp == NULL) {
perror("Error in opening file");
return(-1);
}
while(1) {
c = fgetc(fp);
if( feof(fp) ) {
break ;
}
printf("%c", c);
}
fclose(fp);
return(0);
}Captionless Image Output
Explanation: The output of the given code is "Hii".
Struct in Programming
A struct in the C programming language is a composite data type declaration that defines a physically grouped list of variables under one name in a block of memory, allowing the different variables to be accessed via a single pointer or by the struct declared name which returns the.