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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What is the output of the program

#include<stdio.h>
int main()
{
    struct emp
    {
        char name[20];
        int age;
        float sal;
    };
    struct emp e = {"Tiger"};
    printf("%d, %f\n", e.age, e.sal);
    return 0;
}

0, 0.000000

Garbage values

Error

None of above

[#]

Which of the following operations are INCORRECT?

int i = 35; i = i%5;

short int j = 255; j = j;

long int k = 365L; k = k;

float a = 3.14; a = a%3;

[#]

Which of the following is the correct order of evaluation for the below expression?
z = x + y * z / 4 % 2 - 1

* / % + - =

= * / % + -

/ * % - + =

* % / - + =

[#]

What will be the output of the program?

#include<stdio.h>
int main()
{
    float d=2.25;
    printf("%e,", d);
    printf("%f,", d);
    printf("%g,", d);
    printf("%lf", d);
    return 0;
}

2.2, 2.50, 2.50, 2.5

2.2e, 2.25f, 2.00, 2.25

2.250000e+000, 2.250000, 2.25, 2.250000

Error

[#]

What will be the output of the program?

#include<stdio.h>
int fun(int(*)());

int main()
{
    fun(main);
    printf("Hi\n");
    return 0;
}
int fun(int (*p)())
{
    printf("Hello ");
    return 0;
}

Infinite loop

Hello Hi

Error

[#]

What will be the output of the program?

#include<stdio.h>
int func1(int);

int main()
{
    int k=35;
    k = func1(k=func1(k=func1(k)));
    printf("k=%d\n", k);
    return 0;
}
int func1(int k)
{
    k++;
    return k;
}

k=35

k=36

k=37

k=38

[#]

What will be the output of the program?

#include<stdio.h>
#define FUN(i, j) i##j

int main()
{
    int va1=10;
    int va12=20;
    printf("%d\n", FUN(va1, 2));
    return 0;
}

1020

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

The following program will make you understand about ## (macro concatenation) operator clearly.

#include<stdio.h>
#define FUN(i, j) i##j

int main()
{
    int First  	= 10;
    int Second  = 20;

    char FirstSecond[] = "IndiaBIX";

    printf("%s\n", FUN(First, Second) );

    return 0;
}

Output:
-------
IndiaBIX

The preprocessor will replace FUN(First, Second) as FirstSecond.

Therefore, the printf("%s\n", FUN(First, Second) ); statement will become as printf("%s\n", FirstSecond );

Hence it prints IndiaBIX as output.

Like the same, the line printf("%d\n", FUN(va1, 2)); given in the above question will become as printf("%d\n", va12 );.

Therefore, it prints 20 as output.

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Learn more problems on : C Preprocessor

[#]

Will the program compile successfully?

#include<stdio.h>

int main()
{
    printf("India" "BIX\n");
    return 0;
}

Yes

[#]

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;
}

448, 4, 4

520, 2, 2

1006, 2, 2

Error

[#]

10.

Which of the following statements correctly declare a function that receives a pointer to pointer to a pointer to a float and returns a pointer to a pointer to a pointer to a pointer to a float?

float **fun(float***);

float *fun(float**);

float fun(float***);

float ****fun(float***);

[#]

11.

What will happen if in a C program you assign a value to an array element whose subscript exceeds the size of array?

The element will be set to 0.

The compiler would report an error.

The program may crash if some important data gets overwritten.

The array size would appropriately grow.

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

If the index of the array size is exceeded, the program will crash. Hence "option c" is the correct answer. But the modern compilers will take care of this kind of errors.

Example: Run the below program, it will crash in Windows (TurboC Compiler)

#include<stdio.h>

int main()
{
    int arr[2];
    arr[3]=10;
    printf("%d",arr[3]);
    return 0;
}

Since C is a compiler dependent language, it may give different outputs at different platforms. We have given the Turbo-C Compiler (Windows) output.

Please try the above programs in Windows (Turbo-C Compiler) and Linux (GCC Compiler), you will understand the difference better.

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Learn more problems on : Arrays

[#]

12.

What will be the output of the program ?

#include<stdio.h>

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

0, 0, 0
1, 1, 1
2, 2, 2
3, 3, 3

1, 1, 2
2, 2, 3
3, 3, 4
4, 4, 1

1, 1, 1
2, 2, 2
3, 3, 3
3, 4, 4

0, 1, 2
1, 2, 3
2, 3, 4
3, 4, 5

[#]

13.

What will be the output of the program in 16-bit platform (under DOS)?

#include<stdio.h>

int main()
{
    struct node
    {
        int data;
        struct node *link;
    };
    struct node *p, *q;
    p = (struct node *) malloc(sizeof(struct node));
    q = (struct node *) malloc(sizeof(struct node));
    printf("%d, %d\n", sizeof(p), sizeof(q));
    return 0;
}

2, 2

8, 8

5, 5

4, 4

[#]

14.

Which of the following statements correct about the below program?

#include<stdio.h>

int main()
{
    union a
    {
        int i;
        char ch[2];
    };
    union a u1 = {512};
    union a u2 = {0, 2};
    return 0;
}

1:	u2 CANNOT be initialized as shown.
2:	u1 can be initialized as shown.
3:	To initialize char ch[] of u2 '.' operator should be used.
4:	The code causes an error 'Declaration syntax error'

1, 2

2, 3

1, 2, 3

1, 3, 4

[#]

15.

A text stream is an ordered sequence of characters composed into lines, each line consisting of zero or more characters plus a terminating new-line character.

True

False

[#]

16.

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

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

int main(int argc, int *argv)
{
    int i;
    for(i=1; i<argc; i++)
        printf("%s\n", argv[i]);
    return 0;
}

*.c

"*.c"

sample *.c

List of all files and folders in the current directory

[#]

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.

Can we write a function that takes a variable argument list and passes the list to another function?

Yes

[#]

19.

What do the following declaration signify?

char *scr;

scr is a pointer to pointer variable.

scr is a function pointer.

scr is a pointer to char.

scr is a member of function pointer.

[#]

20.

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

#include<stdio.h>
double i;

int main()
{
    (int)(float)(char) i;
    printf("%d", sizeof((int)(float)(char)i));
    return 0;
}

[#]

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