C Programming MCQ - File Handling

11. If there is any error while opening a file, fopen will return?

A. Nothing
B. EOF
C. NULL
D. Depends on compiler

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12. It is not possible to combine two or more file opening mode in open () method.

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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13. What is the return value of putchar()?

A. The character written
B. EOF if an error occurs
C. Nothing
D. Both character written & EOF if an error occurs

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14. Which is true?

A. The symbolic constant EOF is defined in
B. The value is -1
C. The symbolic constant EOF is defined in & value is -1
D. Only value is -1

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15. What is the purpose of "rb" in fopen() function used below in the code? FILE *fp; fp = fopen("demo.txt", "rb");

A. Open "demo.txt" in binary mode for reading
B. Create a new file "demo.txt" for reading and writing
C. Open "demo.txt" in binary mode for reading and writing
D. None of the above

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16. Which files will get closed through the fclose() in the following program?

void main()
{
       FILE *fp, *ft;
       fp = fopen("a.txt", "r");
       ft = fopen("b.txt", "r");
       fclose(fp,ft);
}

A. a, b
B. a
C. b
D. Error in fclose

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17. When fopen() is not able to open a file, it returns

A. EOF
B. NULL
C. Run-time Error
D. None of the above

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18. getc() returns EOF when

A. When getc() fail to read the character
B. When end of file is reached
C. Both A and B
D. None of the above

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19. What is the output of this program?

#include <stdio.h>
int main(){
    FILE *fp;
    char *str;
    fp=fopen("demo.txt","r");// demo.txt :you are a good programmer
    while(fgets(str,6,fp)!=NULL)
    puts(str);
    fclose(fp);
    return 0;
}

A. you are a good programmer
B. e a good programmer
C. you ar
D. you are

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20. What is the output of this program?

#include <stdio.h>
int main(){
    char c;
    FILE *fp;
    fp=fopen("demo.txt","r");
    while((c=fgetc(fp))!=EOF)
         printf("%c",c);
    fclose(fp);
    return 0;
}

A. It will print the content of file demo.txt
B. It will print the content of file till it encouter new line character
C. Compilation Error
D. None of the above

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