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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Identify which of the following are declarations

1 :	extern int x;
2 :	float square ( float x ) { ... }
3 :	double pow(double, double);

1 and 3

[#]

Which of the structure is incorrcet?

1 :	`struct aa { int a; float b; };`
2 :	`struct aa { int a; float b; struct aa var; };`
3 :	`struct aa { int a; float b; struct aa *var; };`

1, 2, 3

[#]

Point out the error, if any in the program.

#include<stdio.h>
int main()
{
    int i = 1;
    switch(i)
    {
        case 1:
           printf("Case1");
           break;
        case 1*2+4:
           printf("Case2");
           break;
    }
return 0;
}

Error: in case 1*2+4 statement

Error: No default specified

Error: in switch statement

No Error

[#]

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()
{
    float f=43.20;
    printf("%e, ", f);
    printf("%f, ", f);
    printf("%g", f);
    return 0;
}

4.320000e⁺⁰¹, 43.200001, 43.2

4.3, 43.22, 43.21

4.3e, 43.20f, 43.00

Error

[#]

What will be the output of the program?

#include<stdio.h>
int main()
{
    float a=0.7;
    if(a < 0.7f)
        printf("C\n");
    else
        printf("C++\n");
    return 0;
}

C++

Compiler error

Non of above

Your Answer: Option

(Not Answered)

Correct Answer: Option

Explanation:

if(a < 0.7f) here a is a float variable and 0.7f is a float constant. The float variable a is not less than 0.7f float constant. But both are equal. Hence the if condition is failed and it goes to else it prints 'C++'
Example:

#include<stdio.h>
int main()
{
    float a=0.7;
    printf("%.10f %.10f\n",0.7f, a);
    return 0;
}

Output:
0.6999999881 0.6999999881

Discuss about this problem : Discuss in Forum

Learn more problems on : Floating Point Issues

[#]

What will be the output of the program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int i=0;
    i++;
    if(i<=5)
    {
        printf("IndiaBIX");
        exit(1);
        main();
    }
    return 0;
}

Prints "IndiaBIX" 5 times

Function main() doesn't calls itself

Infinite loop

Prints "IndiaBIx"

[#]

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

#include<stdio.h>

int main()
{
    int fun();
    int i;
    i = fun();
    printf("%d\n", i);
    return 0;
}
int fun()
{
    _AX = 1990;
}

Garbage value

0 (Zero)

1990

No output

[#]

What will be the output of the program?

#include<stdio.h>
void fun(int);
typedef int (*pf) (int, int);
int proc(pf, int, int);

int main()
{
    int a=3;
    fun(a);
    return 0;
}
void fun(int n)
{
    if(n > 0)
    {
        fun(--n);
        printf("%d,", n);
        fun(--n);
    }
}

0, 2, 1, 0,

1, 1, 2, 0,

0, 1, 0, 2,

0, 1, 2, 0,

[#]

10.

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

[#]

11.

In the following program add a statement in the function fact() such that the factorial gets stored in j.

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

int main()
{
    int i=5;
    fact(&i);
    printf("%d\n", i);
    return 0;
}
void fact(int *j)
{
    static int s=1;
    if(*j!=0)
    {
        s = s**j;
        *j = *j-1;
        fact(j);
        /* Add a statement here */
    }
}

j=s;

*j=s;

*j=&s;

&j=s;

[#]

12.

Are the expressions arr and &arr same for an array of 10 integers?

Yes

[#]

13.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    static char mess[6][30] = {"Don't walk in front of me...", 
                               "I may not follow;", 
                               "Don't walk behind me...", 
                               "Just walk beside me...", 
                               "And be my friend." };

    printf("%c, %c\n", *(mess[2]+9), *(*(mess+2)+9));
    return 0;
}

t, t

k, k

n, k

m, f

[#]

14.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    printf(5+"Good Morning\n");
    return 0;
}

Good Morning

Good

Morning

[#]

15.

The maximum combined length of the command-line arguments including the spaces between adjacent arguments is

128 characters

256 characters

67 characters

It may vary from one operating system to another

[#]

16.

Specify the 2 library functions to dynamically allocate memory?

malloc() and memalloc()

alloc() and memalloc()

malloc() and calloc()

memalloc() and faralloc()

[#]

17.

What will be the output of the program?

#include<stdio.h>
#include<stdarg.h>
void fun1(int num, ...);
void fun2(int num, ...);

int main()
{
    fun1(1, "Apple", "Boys", "Cats", "Dogs");
    fun2(2, 12, 13, 14);
    return 0;
}
void fun1(int num, ...)
{
    char *str;
    va_list ptr;
    va_start(ptr, num);
    str = va_arg(ptr, char *);
    printf("%s ", str);
}
void fun2(int num, ...)
{
    va_list ptr;
    va_start(ptr, num);
    num = va_arg(ptr, int);
    printf("%d", num);
}

Dogs 12

Cats 14

Boys 13

Apple 12

[#]

18.

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>
fun(...);

int main()
{
    fun(3, 7, -11.2, 0.66);
    return 0;
}
fun(...)
{
    va_list ptr;
    int num;
    va_start(ptr, n);
    num = va_arg(ptr, int);
    printf("%d", num);
}

Error: fun() needs return type

Error: ptr Lvalue required

Error: Invalid declaration of fun(...)

No error

[#]

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(i));
    return 0;
}

[#]

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