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Input / Output - Programming

Q1:

Point out the error in the program? 
#include<stdio.h>

int main()
{
    FILE *fp;
    fp=fopen('trial', 'r');
    fseek(fp, '20', SEEK_SET);
    fclose(fp);
    return 0;
}

A Error: unrecognised Keyword SEEK_SET

B Error: fseek() long offset value

C No error

D None of above

ANS:A - Error: unrecognised Keyword SEEK_SET

Instead of '20' use 20L since fseek() need a long offset value.