Online C Programming Test - C Programming Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following is the correct usage of conditional operators used in C?

a>b ? c=30 : c=40;

a>b ? c=30;

max = a>b ? a>c?a:c:b>c?b:c

return (a>b)?(a:b)

[#]

Will the expression *p = p be disallowed by the compiler?

Yes

[#]

Are the following two statement same?

1.	a <= 20 ? (b = 30): (c = 30);
2.	(a <=20) ? b : (c = 30);

Yes

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

No, the expressions 1 and 2 are not same.

1. a <= 20 ? (b = 30) : (c = 30); This statement can be rewritten as,


if(a <= 20)
{
    b = 30;
}
else
{
    c = 30;
}

2. (a <=20) ? b : (c = 30); This statement can be rewritten as,


if(a <= 20)
{
    //Nothing here
}
else
{
    c = 30;
}

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Learn more problems on : Expressions

[#]

We want to round off x, a float, to an int value, The correct way to do is

y = (int)(x + 0.5)

y = int(x + 0.5)

y = (int)x + 0.5

y = (int)((int)x + 0.5)

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

Rounding off a value means replacing it by a nearest value that is approximately equal or smaller or greater to the given number.

y = (int)(x + 0.5); here x is any float value. To roundoff, we have to typecast the value of x by using (int)

Example:


#include <stdio.h>

int main ()
{
  float x = 3.6;
  int y = (int)(x + 0.5);
  printf ("Result = %d\n", y );
  return 0;
}

Output:
Result = 4.

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Learn more problems on : Floating Point Issues

[#]

What is the notation for following functions?

1.  int f(int a, float b)
    {
        /* Some code */
    }

2.  int f(a, b)
    int a; float b;
    {
        /* Some code */
    }

1. KR Notation
2. ANSI Notation

1. Pre ANSI C Notation
2. KR Notation

1. ANSI Notation
2. KR Notation

1. ANSI Notation
2. Pre ANSI Notation

[#]

Names of functions in two different files linked together must be unique

True

False

[#]

Would the following typedef work?
typedef #include l;

Yes

[#]

Which of the following statements mentioning the name of the array begins DOES NOT yield the base address?

1:	When array name is used with the sizeof operator.
2:	When array name is operand of the & operator.
3:	When array name is passed to scanf() function.
4:	When array name is passed to printf() function.

A, B

B, D

[#]

What will be the output of the program ?

#include<stdio.h>

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

Error

IndiaBIX

Base address of str

No output

[#]

10.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    float a=3.15529;
    printf("%2.1f\n", a);
    return 0;
}

3.00

3.15

3.2

[#]

11.

What will be the output of the program (sample.c) given below if it is executed from the command line?
cmd> sample one two three

/* sample.c */
#include<stdio.h>

int main(int argc, char *argv[])
{
    int i=0;
    i+=strlen(argv[1]);
    while(i>0)
    {
        printf("%c", argv[1][--i]);
    }
    return 0;
}

three two one

owt

eno

eerht

[#]

12.

Bitwise & can be used to check if more than one bit in a number is on.

True

False

[#]

13.

What is x in the following program?

#include<stdio.h>

int main()
{
    typedef char (*(*arrfptr[3])())[10];
    arrfptr x;
    return 0;
}

x is a pointer

x is an array of three pointer

x is an array of three function pointers

Error in x declaration

[#]

14.

What will be the output of the program?

#include<stdio.h>

int main()
{
    typedef int LONG;
    LONG a=4;
    LONG b=68;
    float c=0;
    c=b;
    b+=a;
    printf("%d,", b);
    printf("%f\n", c);
    return 0;
}

72, 68.000000

72.000000, 68

68.000000, 72.000000

68, 72.000000

[#]

15.

Assume integer is 2 bytes wide. How many bytes will be allocated for the following code?

#include<stdio.h>
#include<stdlib.h>
#define MAXROW 3
#define MAXCOL 4

int main()
{
    int (*p)[MAXCOL];
    p = (int (*) [MAXCOL])malloc(MAXROW *sizeof(*p));
    return 0;
}

56 bytes

128 bytes

24 bytes

12 bytes

[#]

16.

Which of the following statement is correct prototype of the malloc() function in c ?

int* malloc(int);

char* malloc(char);

unsigned int* malloc(unsigned int);

void* malloc(size_t);

[#]

17.

What will be the output of the program?

#include<stdio.h>
#include<stdarg.h>
void fun1(char, int, int *, float *, char *);
void fun2(char ch, ...);
void (*p1)(char, int, int *, float *, char *);
void (*p2)(char ch, ...);

int main()
{
    char ch='A'; int i=10;
    float f=3.14; char *p="Hello";
    p1=fun1;
    p2=fun2;
    (*p1)(ch, i, &i, &f, p);
    (*p2)(ch, i, &i, &f, p);
    return 0;
}
void fun1(char ch, int i, int *pi, float *pf, char *p)
{
    printf("%c %d %d %f %s \n", ch, i, *pi, *pf, p);
}
void fun2(char ch, ...)
{
    int i, *pi; float *pf; char *p;
    va_list list;
    printf("%c ", ch);
    va_start(list, ch);
    i = va_arg(list, int);
    printf("%d ", i);
    
    pi = va_arg(list, int*);
    printf("%d ", *pi);
    pf = va_arg(list, float*);
    printf("%f ", *pf);
    p = va_arg(list, char *);
    printf("%s", p);
}

A 10 3.14
A 10 3.14

A 10 10 3.140000 Hello
A 10 10 3.140000 Hello

A 10 Hello
A 10 Hello

Error

[#]

18.

What will be the output of the program?

#include<stdio.h>
#include<stdarg.h>
void display(int num, ...);

int main()
{
    display(4, 'A', 'B', 'C', 'D');
    return 0;
}
void display(int num, ...)
{
    char c, c1; int j;
    va_list ptr, ptr1;
    va_start(ptr, num);
    va_start(ptr1, num);
    for(j=1; j<=num; j++)
    {
        c = va_arg(ptr, int);
        printf("%c", c);
        c1 = va_arg(ptr1, int);
        printf("%d\n", c1);
    }
}

A, A
B, B
C, C
D, D

A, a
B, b
C, c
D, d

A, 65
B, 66
C, 67
D, 68

A, 0
B, 0
C, 0
C, 0

[#]

19.

Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

Yes

[#]

20.

What will be the output of the program?

#include<stdio.h>
typedef void v;
typedef int i;

int main()
{
    v fun(i, i);
    fun(2, 3);
    return 0;
}
v fun(i a, i b)
{
    i s=2;
    float i;
    printf("%d,", sizeof(i));
    printf(" %d", a*b*s);
}

2, 8

4, 8

2, 4

4, 12

[#]

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