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fseek() in C/C++
fseek() in C language, is use to move file pointer to a specific position. Offset and stream are the destination of pointer, is given in the function parameters. If successful, it returns zero. If it is not successful, it returns non-zero value.
Here is the syntax of fseek() in C language,
int fseek(FILE *stream, long int offset, int whence)
Here are the parameters used in fseek()
stream − This is the pointer to identify the stream.
offset − This is the number of bytes from the position.
whence − This is the position from where offset is added.
whence is specified by one of the following constants.
SEEK_END − End of file.
SEEK_SET − Starting of file.
SEEK_CUR − Current position of file pointer.
Here is an example of fseek() in C language.
Let’s say we have “demo.txt” file with the following content −
This is demo text! This is demo text! This is demo text! This is demo text!
Now let us see the code.
Example
#include<stdio.h>
void main() {
FILE *f;
f = fopen("demo.txt", "r");
if(f == NULL) {
printf("\n Can't open file or file doesn't exist.");
exit(0);
}
fseek(f, 0, SEEK_END);
printf("The size of file : %ld bytes", ftell(f));
getch();
}Output
The size of file : 78 bytes
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