C Programming - Input / Output

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Exercise

"Weakness of attitude becomes weakness of character."

- Albert Einstein

Point out the error in the program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    unsigned char;
    FILE *fp;
    fp=fopen("trial", "r");
    if(!fp)
    {
        printf("Unable to open file");
        exit(1);
    }
    fclose(fp);
    return 0;
}

A.	Error: in unsigned char statement
B.	Error: unknown file pointer
C.	No error
D.	None of above

Point out the error in the program?

#include<stdio.h>

int main()
{
    char ch;
    int i;
    scanf("%c", &i);
    scanf("%d", &ch);
    printf("%c %d", ch, i);
    return 0;
}

A.	Error: suspicious char to in conversion in scanf()
B.	Error: we may not get input for second scanf() statement
C.	No error
D.	None of above

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

Point out the error in the program?

#include<stdio.h>

/* Assume there is a file called 'file.c' in c:\tc directory. */
int main()
{
    FILE *fp;
    fp=fopen("c:\tc\file.c", "r");    
    if(!fp) 
      printf("Unable to open file.");        

    fclose(fp);
    return 0;
}

A.	No error, No output.
B.	Program crashes at run time.
C.	Output: Unable to open file.
D.	None of above

Point out the error/warning in the program?

#include<stdio.h>

int main()
{
    unsigned char ch;
    FILE *fp;
    fp=fopen("trial", "r");
    while((ch = getc(fp))!=EOF)
        printf("%c", ch);
    fclose(fp);
    return 0;
}

A.	Error: in unsigned char declaration
B.	Error: while statement
C.	No error
D.	It prints all characters in file "trial"