Online C Programming Test - C Programming Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Which of the structure is correct?

1 :	`struct book { char name[10]; float price; int pages; };`
2 :	`struct aa { char name[10]; float price; int pages; }`
3 :	`struct aa { char name[10]; float price; int pages; }`

All of above

[#]

Which of the following correctly represents a long double constant?

6.68

6.68L

6.68f

6.68LF

[#]

Which of the following is not logical operator?

[#]

A function cannot be defined inside another function

True

False

[#]

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

Discuss about this problem : Discuss in Forum

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[#]

What will be the output of the program?

#include<stdio.h>
#define JOIN(s1, s2) printf("%s=%s %s=%s \n", #s1, s1, #s2, s2);
int main()
{
    char *str1="India";
    char *str2="BIX";
    JOIN(str1, str2);
    return 0;
}

str1=IndiaBIX str2=BIX

str1=India str2=BIX

str1=India str2=IndiaBIX

Error: in macro substitution

[#]

A preprocessor directive is a message from compiler to a linker.

True

False

[#]

What will be the output of the program ?

#include<stdio.h>
power(int**);
int main()
{
    int a=5, *aa; /* Address of 'a' is 1000 */
    aa = &a;
    a = power(&aa);
    printf("%d\n", a);
    return 0;
}
power(int **ptr)
{
    int b;
    b = **ptr***ptr;
    return (b);
}

125

Garbage value

[#]

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***);

[#]

10.

What will be the output of the program ?

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

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

[#]

11.

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

[#]

12.

A pointer union CANNOT be created

Yes

[#]

13.

What will be the output of the program ?

#include<stdio.h>

int main()
{
    int a=250;
    printf("%1d\n", a);
    return 0;
}

1250

250

[#]

14.

Point out the error in the program?

#include<stdio.h>

int main()
{
    FILE *fp;
    fp=fopen("trial", "r");
    fseek(fp, "20", SEEK_SET);
    fclose(fp);
    return 0;
}

Error: unrecognised Keyword SEEK_SET

Error: fseek() long offset value

No error

None of above

[#]

15.

Which of the following statement is correct about the program?

#include<stdio.h>

int main()
{
    FILE *fp;
    char ch;
    int i=1;
    fp = fopen("myfile.c", "r");
    while((ch=getc(fp))!=EOF)
    {
        if(ch == '\n')
            i++;
    }
    fclose(fp);
    return 0;
}

The code counts number of characters in the file

The code counts number of words in the file

The code counts number of blank lines in the file

The code counts number of lines in the file

[#]

16.

Does there exist any way to make the command-line arguments available to other functions without passing them as arguments to the function?

Yes

[#]

17.

Bitwise & can be used to check if a bit in number is set or not.

True

False

[#]

18.

A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

True

False

[#]

19.

The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

True

False

[#]

20.

Can we pass a variable argument list to a function at run-time?

Yes

[#]

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