C Language quiz questions

On declaring a structure 0 bytes are reserved in memory.

1. True

2. False

Point out the error in the program?

struct emp
{
    int ecode;
    struct emp *e;
};

1. Error: in structure declaration

2. Linker Error

3. No Error

4. None of above

What will be the output of the program ?

#include<stdio.h>
    struct course
    {
        int courseno;
        char coursename[25];
    };
int main()
{
    struct course c[] = { {102, "Java"}, 
                          {103, "PHP"}, 
                          {104, "DotNet"}     };
    printf("%d ", c[1].courseno);
    printf("%s\n", (*(c+2)).coursename);
    return 0;
}

1. 103 DotNet

2. 102 Java

3. 103 PHP

4. 104 DotNet

What will be the output of the program ?

#include<stdio.h>
#include<string.h>
int main()
{
    char sentence[80];
    int i;
    printf("Enter a line of text\n");
    gets(sentence);
    for(i=strlen(sentence)-1; i >=0; i--)
        putchar(sentence[i]);
    return 0;
}

1. The sentence will get printed in same order as it entered

2. The sentence will get printed in reverse order

3. Half of the sentence will get printed

4. None of above

The library function used to reverse a string is

1. strstr()

2. strrev()

3. revstr()

4. strreverse()

What will be the output of the program if the array begins at 65472 and each integer occupies 2 bytes?

#include<stdio.h>
int main()
{
    int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0};
    printf("%u, %u\n", a+1, &a+1);
    return 0;
}

1. 65474, 65476

2. 65480, 65496

3. 65480, 65488

4. 65474, 65488

Is this a correct way for NULL pointer assignment?
int i=0;
char *q=(char*)i;

1. Yes

2. No

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;
}

1. No output

2. 30

3. 3

4. 300

Macros have a local scope.

1. True

2. False

Are the following two statement same?

1. Yes

2. No

What will be the output of the program?

#include<stdio.h>
int main()
{
    int i=4, j=-1, k=0, w, x, y, z;
    w = i || j || k;
    x = i && j && k;
    y = i || j &&k;
    z = i && j || k;
    printf("%d, %d, %d, %d\n", w, x, y, z);
    return 0;
}

1. 1, 1, 1, 1

2. 1, 1, 0, 1

3. 1, 0, 0, 1

4. 1, 0, 1, 1

Which of the following statements are correct about the program?

#include<stdio.h>
int main()
{
    int x = 30, y = 40;
    if(x == y)
        printf("x is equal to y\n");
    else if(x > y)
        printf("x is greater than y\n");
    else if(x < y)
        printf("x is less than y\n")
    return 0;
}

1. Error: Statement missing

2. Error: Expression syntax

3. Error: Lvalue required

4. Error: Rvalue required

Point out the error, if any in the program.

#include<stdio.h> 
int main()
{
    int a = 10, b;
    a >=5 ? b=100: b=200;
    printf("%d\n", b);
    return 0;
}

1. 100

2. 200

3. Error: L value required for b

4. Garbage value

Which of the following cannot be checked in a switch-case statement?

1. Character

2. Integer

3. Float

4. enum

What will be the output of the program?

#include<stdio.h>
int main()
{
    unsigned int res;
    res = (64 >>(2+1-2)) & (~(1<<2));
    printf("%d\n", res);
    return 0;
}

1. 32

2. 64

3. 0

4. 128

What will be the output of the program?

#define P printf("%d\n", -1^~0);
#define M(P) int main()\
             {\
                P\
                return 0;\
             }
M(P)

1. 1

2. 0

3. -1

4. 2

To scan a and b given below, which of the following scanf() statement will you use?

#include<stdio.h>
float a;
double b;

1. scanf("%f %f", &a, &b);

2. scanf("%Lf %Lf", &a, &b);

3. scanf("%f %Lf", &a, &b);

4. scanf("%f %lf", &a, &b);

Can we have an array of bit fields?

1. Yes

2. No

Nested unions are allowed

1. True

2. False

What will be the output of the program ?

#include<stdio.h>
int main()
{
    union var
    {
        int a, b;
    };
    union var v;
    v.a=10;
    v.b=20;
    printf("%d\n", v.a);
    return 0;
}

1. 10

2. 20

3. 30

4. 0