C Programming Questions and Answers

Showing 1 - 4 of 4 questions

Point out the error in the program?

#include < stdio.h >#include < stdlib.h >int main()
{
    unsignedchar;
    FILE *fp;
    fp=fopen("trial", "r");
    if(!fp)
    {
        printf("Unable to open file");
        exit(1);
    }
    fclose(fp);
    return0;
}

Error: in unsigned char statement

Error: unknown file pointer

No error

None of above

correct answer c

Answer :

Option C

Explanation :

This program tries to open the file trial.txt in read mode. If file not exists or unable to read it prints "Unable to open file" and then terminate the program.
If file exists, it simply close the file and then terminates the program.

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);
    return0;
}

No error, No output.

Program crashes at run time.

Output: Unable to open file.

None of above

correct answer c

Answer :

Option C

Explanation :

The path of file name must be given as "c:\\tc\file.c"

Point out the error/warning in the program?

#include < stdio.h >int main()
{
    unsignedchar ch;
    FILE *fp;
    fp=fopen("trial", "r");
    while((ch = getc(fp))!=EOF)
        printf("%c", ch);
    fclose(fp);
    return0;
}

Error: in unsigned char declaration

Error: while statement

No error

It prints all characters in file "trial"

correct answer a

Answer :

Option A

Explanation :

Here, EOF is -1. As 'ch' is declared as unsigned char it cannot deal with any negative value.

Point out the correct statements about the program?

#includeint main()
{
    FILE *fptr;
    char str[80];
    fptr = fopen("f1.dat", "w");
    if(fptr == NULL)
        printf("Cannot open file");
    else
    {
        while(strlen(gets(str))>0)
        {
            fputs(str, fptr);
            fputs("\n", fptr);
        }
        fclose(fptr);
    }
    return0;
}