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rewind() in C programming
File Handling: rewind() in C programming
File Handling is a very useful operation in C programming as it help to curb with various insufficiency and error of normal limitation of stdout console in the language. Some insufficiency are, unable to display large size of data in the stdout console. There are various functions in File handling and here we will talk about rewind() in C programming.
rewind() in C programming
rewind() function is used to set the file pointer or indicator associated with the stream to the beginning of the given stream or file.
Syntax:
void rewind(FILE*stream);
Explanation:
- File- it is used to represent the file that is pointed by the indicator and specifies that it is open.
- stream- it is a pointer to the file that identifies the stream for which a memory is associated with it.
Return Value:
- rewind()- it does not return any value.
Also there is no upfront way to check is rewind() function worked in your program or not.
Example 1:
Run
#include<stdio.h> int main() { int i; FILE *rewi; rewi = fopen("file.txt", "r"); if (rewi) { while ((i = getc(rewi)) != EOF) { putchar(i); } rewind(rewi); putchar('\n'); while ((i = getc(rewi)) != EOF) { putchar(i); } } fclose(rewi); return 0; } Output:
File opened successfully File opened successfully
Alert This output is assumed to show you that this program will print 2 times due to the rewind() function and will print the content of the file. Also this code would not work in online compiler as File Handling works on device memory.
Example 2:
Run
#include <stdio.h> #include <conio.h> void main() { FILE *flptr; char b; clrscr(); flptr = fopen("myfile.txt","r"); while((c = fgetc(flptr)) != EOF) { printf("%c",b); } rewind(flptr); while((b=fgetc(flptr))!=EOF) { printf("%c",b); } fclose(flptr); getch(); } Input:
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Output:
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