Online C Programming Test - C Programming Test 5

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Total number of questions: 20.
Time allotted: 20 minutes.
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The modulus operator cannot be used with a long double.

True

False

[#]

What will be the output of the program?

#include<stdio.h>
int main()
{
    int i=-3, j=2, k=0, m;
    m = ++i && ++j && ++k;
    printf("%d, %d, %d, %d\n", i, j, k, m);
    return 0;
}

-2, 3, 1, 1

2, 3, 1, 2

1, 2, 3, 1

3, 3, 1, 2

[#]

In a function two return statements should never occur.

Yes

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

No, In a function two return statements can occur but not successively.

Example:


#include <stdio.h>
int mul(int, int); /* Function prototype */

int main()
{
    int a = 0, b = 3, c;
    c = mul(a, b);
    printf("c = %d\n", c);
    return 0;
}

/* Two return statements in the mul() function */
int mul(int a, int b)
{
   if(a == 0 || b == 0)
   {
        return 0;
   }
   else
   {
        return (a * b);
   }
}

Output:
c = 0

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[#]

It is necessary that a header files should have a .h extension?

Yes

[#]

How many bytes are occupied by near, far and huge pointers (DOS)?

near=2 far=4 huge=4

near=4 far=8 huge=8

near=2 far=4 huge=8

near=4 far=4 huge=8

[#]

What will be the output of the program ?

#include<stdio.h>

int main()
{
    void *vp;
    char ch=74, *cp="JACK";
    int j=65;
    vp=&ch;
    printf("%c", *(char*)vp);
    vp=&j;
    printf("%c", *(int*)vp);
    vp=cp;
    printf("%s", (char*)vp+2);
    return 0;
}

JCK

J65K

JAK

JACK

[#]

What will be the output of the program ?

#include<stdio.h>

int main()
{
    int x=30, *y, *z;
    y=&x; /* Assume address of x is 500 and integer is 4 byte size */
    z=y;
    *y++=*z++;
    x++;
    printf("x=%d, y=%d, z=%d\n", x, y, z);
    return 0;
}

x=31, y=502, z=502

x=31, y=500, z=500

x=31, y=498, z=498

x=31, y=504, z=504

[#]

Which of the statements is correct about the program?

#include<stdio.h>

int main()
{
    int arr[3][3] = {1, 2, 3, 4};
    printf("%d\n", *(*(*(arr))));
    return 0;
}

Output: Garbage value

Output: 1

Output: 3

Error: Invalid indirection

[#]

What will be the output of the program ?

#include<stdio.h>
#include<string.h>

int main()
{
    char str[] = "India\0\BIX\0";
    printf("%s\n", str);
    return 0;
}

BIX

India

India BIX

India\0BIX

[#]

10.

What will be the output of the program in Turbo C (under DOS)?

#include<stdio.h>

int main()
{
    struct emp
    {
        char *n;
        int age;
    };
    struct emp e1 = {"Dravid", 23};
    struct emp e2 = e1;
    strupr(e2.n);
    printf("%s\n", e1.n);
    return 0;
}

Error: Invalid structure assignment

DRAVID

Dravid

No output

[#]

11.

Point out the error in the program?

#include<stdio.h>
#include<string.h>
void modify(struct emp*);
struct emp
{
    char name[20];
    int age;
};
int main()
{
    struct emp e = {"Sanjay", 35};
    modify(&e);
    printf("%s %d", e.name, e.age);
    return 0;
}
void modify(struct emp *p)
{
     p ->age=p->age+2;
}

Error: in structure

Error: in prototype declaration unknown struct emp

No error

None of above

[#]

12.

Point out the error in the program?

#include<stdio.h>

int main()
{
    struct a
    {
        float category:5;
        char scheme:4;
    };
    printf("size=%d", sizeof(struct a));
    return 0;
}

Error: invalid structure member in printf

Error in this float category:5; statement

No error

None of above

[#]

13.

The '.' operator can be used access structure elements using a structure variable.

True

False

[#]

14.

Can we specify a variable filed width in a scanf() format string?

Yes

[#]

15.

Which header file should be included to use functions like malloc() and calloc()?

memory.h

stdlib.h

string.h

dos.h

[#]

16.

If malloc() successfully allocates memory it returns the number of bytes it has allocated.

True

False

[#]

17.

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

True

False

[#]

18.

We can allocate a 2-Dimensional array dynamically.

True

False

[#]

19.

Are the following declarations same?

char far *far *scr;
char far far** scr;

Yes

[#]

20.

What is the purpose of fflush() function.

flushes all streams and specified streams.

flushes only specified stream.

flushes input/output buffer.

flushes file buffer.

[#]

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