C – fseek() function

fseek(): It is used to move the cursor position in the opened file, to perform read and write operations.

int  fseek(FILE* steam,  long offset,  int origin);

Parameters:

• “offset” is a long type variable that represents the number of bytes to move.
  • Positive offset moves the cursor in forward direction
  • Negative offset moves the cursor in backward direction.
• Origin comes with
  • SEEK_SET : Start of the file
  • SEEK_CURR : Current cursor position
  • SEEK_END : End of the file
• On success, if specified location is present, it moves the cursor and returns 0
• On failure, it returns -1.

#include<stdio.h> int main() {             FILE* p;             int ch;               p = fopen(“code.c”, “r”);             if(p==NULL){                         printf(“No such file to open \n”);             }             else{                         fseek(p, 100, SEEK_SET);                         while((ch=fgetc(p)) != -1){                                     printf(“%c”, ch);                                    }                         fclose(p);             }             return 0; }