PAGE 3 C++ AN C

1.	What will be the output of the program ? #include<stdio.h> int main() { static char *s[] = {"black", "white", "pink", "violet"}; char **ptr[] = {s+3, s+2, s+1, s}, ***p; p = ptr; ++p; printf("%s", **p+1); return 0; }
	A. ink B. ack C. ite D. let

Answer: Option A

2.	What will be the output of the program ? #include<stdio.h> int main() { int i=3, *j, k; j = &i; printf("%d\n", i**j*i+*j); return 0; }
	A. 30 B. 27 C. 9 D. 3

Answer: Option A
3. 
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;
} 

A.	x=31, y=502, z=502	B.	x=31, y=500, z=500
C.	x=31, y=498, z=498	D.	x=31, y=504, z=504

Answer: Option D

4.	What will be the output of the program ? #include<stdio.h> int main() { char str[20] = "Hello"; char *const p=str; *p='M'; printf("%s\n", str); return 0; }
	A. Mello B. Hello C. HMello D. MHello

Answer: Option A
5. 
What will be the output of the program If the integer is 4bytes long?

#include<stdio.h>

int main()
{
    int ***r, **q, *p, i=8;
    p = &i;
    q = &p;
    r = &q;
    printf("%d, %d, %d\n", *p, **q, ***r);
    return 0;
} 

A.	8, 8, 8	B.	4000, 4002, 4004
C.	4000, 4004, 4008	D.	4000, 4008, 4016

Answer: Option A

6.	What will be the output of the program ? #include<stdio.h> void fun(void *p); int i; int main() { void *vptr; vptr = &i; fun(vptr); return 0; } void fun(void *p) { int **q; q = (int**)&p; printf("%d\n", **q); }
	A. Error: cannot convert from void** to int** B. Garbage value C. 0 D. No output

Answer: Option C

7. 
What will be the output of the program ?

#include<stdio.h>

int main()
{
    char *str;
    str = "%s";
    printf(str, "K\n");
    return 0;
} 

A.	Error	B.	No output
C.	K	D.	%s

Answer: Option C

8. 
What will be the output of the program ?

#include<stdio.h>
int *check(static int, static int);

int main()
{
    int *c;
    c = check(10, 20);
    printf("%d\n", c);
    return 0;
}
int *check(static int i, static int j)
{
    int *p, *q;
    p = &i;
    q = &j;
    if(i >= 45)
        return (p);
    else
        return (q);
} 

A.	10
B.	20
C.	Error: Non portable pointer conversion
D.	Error: cannot use static for function parameters

Answer: Option C
Explanation:

In TurboC, the output will be 2, 1 because the size of the pointer is 2 bytes in 16-bit platform.

But in Linux, the output will be 4, 1 because the size of the pointer is 4 bytes.

This difference is due to the platform dependency of C compiler.

10. 
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;
}

A.	JCK	B.	J65K
C.	JAK	D.	JACK

Answer: Option D

11.	What will be the output of the program? #include<stdio.h> int main() { int arr[2][2][2] = {10, 2, 3, 4, 5, 6, 7, 8}; int *p, *q; p = &arr[1][1][1]; q = (int*) arr; printf("%d, %d\n", *p, *q); return 0; }
	A. 8, 10 B. 10, 2 C. 8, 1 D. Garbage values

Answer: Option A

12.	What will be the output of the program assuming that the array begins at the location 1002 and size of an integer is 4 bytes? #include<stdio.h> int main() { int a[3][4] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }; printf("%u, %u, %u\n", a[0]+1, *(a[0]+1), *(*(a+0)+1)); return 0; }
	A. 448, 4, 4 B. 520, 2, 2 C. 1006, 2, 2 D. Error

Answer: Option C

13.	What will be the output of the program? #include<stdio.h> int main() { int arr[3] = {2, 3, 4}; char *p; p = arr; p = (char*)((int*)(p)); printf("%d, ", *p); p = (int*)(p+1); printf("%d", *p); return 0; }
	A. 2, 3 B. 2, 0 C. 2, Garbage value D. 0, 0

Answer: Option B

14.	What will be the output of the program ? #include<stdio.h> int main() { char *str; str = "%d\n"; str++; str++; printf(str-2, 300); return 0; }
	A. No output B. 30 C. 3 D. 300 Answer & Explanation Answer: Option D

15.	What will be the output of the program ? #include<stdio.h> int main() { printf("%c\n", 7["IndiaBIX"]); return 0; }
	A. Error: in printf B. Nothing will print C. print "X" of IndiaBIX D. print "7" Answer & Explanation Answer: Option C