C fseek() function

The fseek() function is used to set the file pointer to the specified offset. It is used to write data into file at desired location.

Syntax:

int fseek(FILE *stream, long int offset, int whence)

 

There are 3 constants used in the fseek() function for whence: SEEK_SET, SEEK_CUR and SEEK_END.

Example:

#include <stdio.h>
void main(){
FILE *fp;

fp = fopen("myfile.txt","w+");
fputs("This is anmolknowledge", fp);

fseek( fp, 7, SEEK_SET );
fputs("anmol", fp);
fclose(fp);
}

 

myfile.txt

This is anmol