Test 1

1. Which of the following statements are correct about the below C-program?

#include

int main()

{

    int x = 10, y = 100%90, i;

    for(i=1; i<10; i++)

    if(x != y);

        printf("x = %d y = %d\n", x, y);

    return 0;

}

1 : The printf() function is called 10 times.
2 : The program will produce the output x = 10 y = 10
3 : The ; after the if(x!=y) will NOT produce an error.
4 : The program will not produce output
1
2,3
3,4
4

2. What will be the output of the program?

#include<stdio.h>

int main()

{

    int k, num=30;

    k = (num>5 ? (num <=10 ? 100 : 200): 500);

    printf('%d\n', num);

    return 0;

}

200
100
30
500

3. Point out the error in the following program.

#include

int main()

{

    struct emp

    {

        char name[20];

        float sal;

    };

    struct emp e[10];

    int i;

    for(i=0; i<=9; i++)

        scanf('%s %f', e[i].name, &e[i].sal);

    return 0;

}

Floating point formats not linked (Run time error)
Cannot use scanf() for structures
Strings cannot be nested inside structures
Suspicious pointer conversion

4. The keyword used to transfer control from a function back to the calling function is
switch
go back
goto
return

5. Which of the following statements are correct about the function?

long fun(int num)

{

    int i;

    long f=1;

    for(i=1; i<=num; i++)

        f = f * i;

    return f;

}

The function calculates the value of 1 raised to power num.
The function calculates the factorial value of an integer
None of above
The function calculates the square root of an integer

6. Which of the statements is correct about the program?

#include



int main()

{

    float a=3.14;

    char *j;

    j = (char*)&a;

    printf("%d\n", *j);

    return 0;

}

It will print a garbage value
It prints character equivalent of the binary number present in the first byte of a float variable a.
It will print 3
It prints ASCII value of the binary number present in the first byte of a float variable a.

7. Will the program compile in Turbo C?

#include<stdio.h>

int main()

{

    int a=10, *j;

    void *k;

    j=k=&a;

    j++;

    k++;

    printf("%u %u\n", j, k);

    return 0;

}

Yes
No

8. Which of the following statements are correct about an array?

1 : The array int num[26]; can store 26 elements.
2 : The expression num[1] designates the very first element in the array.
3 : It is necessary to initialize the array at the time of declaration.
4 : The declaration num[SIZE] is allowed if SIZE is a macro.
1
2, 4
2, 3
1, 4

9. The library function used to find the last occurrence of a character in a string is
strrchr()
strnstr()
aststr()
strstr()

10. If char=1, int=4, and float=4 bytes size, What will be the output of the program?

#include<stdio.h>



int main()

{

    char ch = 'A';

    printf("%d, %d, %d", sizeof(ch), sizeof('A'), sizeof(3.14f));

    return 0;

}

2, 4, 8
1, 2, 4
1, 4, 4
2, 2, 4

11. What will be the output of the program?

#include



int main()

{

    char str[] = "London";

    str[1]='i';

    printf("%s, ", str);

    str = "Bristol"%s", str+1);

    return 0;

}

Lindon, istol
Lindon, Bristol
London, Bristol
Error

12. What will be the output of the program?

#include<stdio.h>



int main()

{

    int i=4, j=8;

    printf("%d, %d, %d\n", i|j&j|i, i|j&j|i, i^j);

    return 0;

}

112, 1, 12
-64, 1, 12
32, 1, 12
12, 12, 12

13. Bit fields CANNOT be used in union.
False
True

14. Which of the following statement is correct about the program?

#include<stdio.h>



int main()

{

    FILE *fp;

    char ch;

    int i=1;

    fp = fopen("myfile.c", "r");

    while((ch=getc(fp))!=EOF)

    {

        if(ch == '\n')

            i++;

    }

    fclose(fp);

    return 0;

}

The code counts number of words in the file
The code counts number of lines in the file
The code counts number of characters in the file
The code counts number of blank lines in the file

15. The first argument to be supplied at command-line must always be count of total arguments.

False
True

16. What will be the output of the program?

#include<stdio.h>



int main()

{

    char c=48;

    int i, mask=01;

    for(i=1; i<=5; i++)

    {

        printf("%c", c|mask);

        mask = mask<<1;

    }

    return 0;

}

12480
12500
12556
12400

17. What is the output of the program?

typedef struct data;

{

    int x;

    sdata *b;

}sdata;

Error: in typedef.
None of above
Error: Declaration missing ';'
No error

18. Which header file should you include, if you are going to develop a function, which can accept variable number of arguments?

varagrg.h
stdlib.h
stdio.h
stdarg.h

19. Point out the error in the following program.

#include<stdio.h>

#include<stdarg.h>

void varfun(int n, ...);



int main()

{

    varfun(3, 7, -11.2, 0.66);

    return 0;

}

void varfun(int n, ...)

{

    float *ptr;

    int num;

    va_start(ptr, n);

    num = va_arg(ptr, int);

    printf("%d", num);

}

Error: invalid access to list member
Error: ptr must be type of va_list
Error: too many parameters
No error

20. va_list is an array that holds information needed by va_arg and va_end

True
False