fseek in c code example

Example 1: fseek function in c

FILE* fp;
// if file is 50 bytes long:
fseek(fp, /* from the end */ 23, SEEK_END); // <- at 50 - 23 so 27
fseek(fp, /* from the start */ 23, SEEK_SET); // 23
fseek(fp, /* from the the current (see ftell) */ 10, SEEK_CUR); // 33

Example 2: fputs in c

#include <stdio.h>

int main () {
   FILE *fp;
   int c;

   fp = fopen("file.txt","r");
   while(1) {
      c = fgetc(fp);
      if( feof(fp) ) {
         break ;
      }
      printf("%c", c);
   }
   fclose(fp);
   return(0);
}

Example 3: fputs in c

#include <stdio.h>

int main () {
   FILE *fp;

   fp = fopen("file.txt", "w+");

   fputs("This is c programming.", fp);
   fputs("This is a system programming language.", fp);

   fclose(fp);
   
   return(0);
}