Introduction to Operator in C - Quiz

Q: What is the output of this C code?


#include<stdio.h>
void main()
{
if(sizeof(int)>-1)
 printf("yes");
 else
  printf("No");
}

A. Yea
B. No
C. 6
D. None of these

Correct Option: B
Remarks:

Explanation: Option B is Correct Answer

Q: Assuming an integer 2-bytes, What will be the output of the program?


#include<stdio.h>

int main()
{
    printf("%x\n", -1<<3);
    return 0;
}

A. ffff
B. fff8
C. 0
D. -1

Correct Option: B
Remarks:

Explanation: Option B:

The system will treat negative numbers in 2's complement method.

Example:

Assume the size of int is 2-bytes(16 bits). The integer value 1 is represented as given below:

Binary of 1: 00000000 00000001 (this is for positive value of 1)

1's complement of binary 1: 11111111 11111110
2's complement of binary 1: 11111111 11111111

Thy system will store '11111111 11111111' in memory to represent '-1'.

If we do left shift (3 bits) on 11111111 11111111 it will become as given below:

11111111 11111111 ---(left shift 3 times)---> 11111111 11111000.

So, 11111111 11111000 ---(binary to hex)---> FF F8. (Required Answer)

Note:

How is the negative number obtained from 2's complement value?

As stated above, -1 is represented as '11111111 11111111' in memory.

So, the system will take 2's complement of '11111111 11111111' to the get the original negative value back.

Example:

Bit Representation of -1: 11111111 11111111

Since the leftmost bit is 1, it is a negative number. Then the value is

1's complement: 00000000 00000000
2's complement: 00000000 00000001 (Add 1 to the above result)

Therefore, '00000000 00000001' = 1 and the sign is negative.

Hence the value is -1.

Q: Identify the correct output of the following code:


#include<stdio.h> 
void main()
{
   int w=10, x=5, y=3, z=3;
   if( (w < x ) && (y=z++) )
      printf("%d %d %d %d", w, x, y, z);
   else
      printf("%d %d %d %d", w, x, y, z);
}

A. 10 5 4 4
B. 10 5 4 3
C. 10 5 3 3
D. 10 5 3 4

Correct Option: C
Remarks:

Explanation: 10 5 3 3

Q: Relational operators cannot be used on:

A. structure
B. long
C. strings
D. float

Correct Option: A
Remarks:

Explanation: <p> Answer: Option A </p> <p>The following table shows all the relational operators supported by C language. Assume variable <strong>A</strong> holds 10 and variable <strong>B</strong> holds 20 then −</p> <table class="table table-bordered"> <tbody> <tr> <th>Operator</th> <th>Description</th> <th>Example</th> </tr> <tr> <td class="ts">==</td> <td>Checks if the values of two operands are equal or not. If yes, then the condition becomes true.</td> <td class="ts">(A == B) is not true.</td> </tr> <tr> <td class="ts">!=</td> <td>Checks if the values of two operands are equal or not. If the values are not equal, then the condition becomes true.</td> <td class="ts">(A != B) is true.</td> </tr> <tr> <td class="ts">></td> <td>Checks if the value of left operand is greater than the value of right operand. If yes, then the condition becomes true.</td> <td class="ts">(A > B) is not true.</td> </tr> <tr> <td class="ts"><</td> <td>Checks if the value of left operand is less than the value of right operand. If yes, then the condition becomes true.</td> <td class="ts">(A < B) is true.</td> </tr> <tr> <td class="ts">>=</td> <td>Checks if the value of left operand is greater than or equal to the value of right operand. If yes, then the condition becomes true.</td> <td class="ts">(A >= B) is not true.</td> </tr> <tr> <td class="ts"><=</td> <td>Checks if the value of left operand is less than or equal to the value of right operand. If yes, then the condition becomes true.</td> <td class="ts">(A <= B) is true.</td> </tr> </tbody> </table>

Q: What is the output of this C code?

    int main()
    {
        int x = -2;
        if (!0 == 1)
            printf("yes\n");
        else
            printf("no\n");
    }

A. Yes
B. No
C. Run time error
D. Undefined

Correct Option: A
Remarks:

Explanation: Option A

Q: What is the output of this C code?

    void main()
    {
        int x = 4, y, z;
        y = --x;
        z = x--;
        printf("%d%d%d", x, y, z);
    }

A. 3 2 3
B. 2 2 3
C. 3 2 2
D. 2 3 3

Correct Option: D
Remarks:

Explanation: Option D

Q: What is the output of this C code?

    void main()
    {
        int x = 4;
        int *p = &x;
        int *k = p++;
        int r = p - k;
        printf("%d", r);
    }

A. 4
B. 8
C. 1
D. Run time error

Correct Option: C
Remarks:

Explanation: Option C

Q: Are logical operators sequence points?

A. True
B. False
C. Depends on the compiler
D. Depends on the standard

Correct Option: A
Remarks:

Explanation: Option A

Q: What is the output of this C code?

    int main()
    {
        int a = 1, b = 1, d = 1;
        printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++);
    }

A. 9, 3, 5
B. 9, 6, 9
C. 15, 4, 5
D. 6, 4, 6

Correct Option: C
Remarks:

Explanation: Option C

Q: What is the output of this C code?

    int main()
    {
        int i = 0;
        int j = i++ + i;
        printf("%d\n", j);
    }

B. 1
C. 2
D. Compile time error

Correct Option: A
Remarks:

Explanation: Option A

Introduction to Operator in C - Quiz

What is the output of this C code?

Assuming an integer 2-bytes, What will be the output of the program?

Identify the correct output of the following code:

Relational operators cannot be used on:

What is the output of this C code?
int main() { int x = -2; if (!0 == 1) printf("yes\n"); else printf("no\n"); }

What is the output of this C code?
void main() { int x = 4, y, z; y = --x; z = x--; printf("%d%d%d", x, y, z); }

What is the output of this C code?
void main() { int x = 4; int p = &x; int k = p++; int r = p - k; printf("%d", r); }

Are logical operators sequence points?

What is the output of this C code?
int main() { int a = 1, b = 1, d = 1; printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++); }

What is the output of this C code?
int main() { int i = 0; int j = i++ + i; printf("%d\n", j); }

Introduction to Operator in C - Quiz

What is the output of this C code? #include<stdio.h> void main() { if(sizeof(int)>-1) printf("yes"); else printf("No"); }

Assuming an integer 2-bytes, What will be the output of the program? #include<stdio.h> int main() { printf("%x\n", -1<<3); return 0; }

Identify the correct output of the following code: #include<stdio.h> void main() { int w=10, x=5, y=3, z=3; if( (w < x ) && (y=z++) ) printf("%d %d %d %d", w, x, y, z); else printf("%d %d %d %d", w, x, y, z); }

Relational operators cannot be used on:

What is the output of this C code? int main() { int x = -2; if (!0 == 1) printf("yes\n"); else printf("no\n"); }

What is the output of this C code? void main() { int x = 4, y, z; y = --x; z = x--; printf("%d%d%d", x, y, z); }

What is the output of this C code? void main() { int x = 4; int *p = &x; int *k = p++; int r = p - k; printf("%d", r); }

Are logical operators sequence points?

What is the output of this C code? int main() { int a = 1, b = 1, d = 1; printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++); }

What is the output of this C code? int main() { int i = 0; int j = i++ + i; printf("%d\n", j); }

What is the output of this C code?

Assuming an integer 2-bytes, What will be the output of the program?

Identify the correct output of the following code:

What is the output of this C code?
int main() { int x = -2; if (!0 == 1) printf("yes\n"); else printf("no\n"); }

What is the output of this C code?
void main() { int x = 4, y, z; y = --x; z = x--; printf("%d%d%d", x, y, z); }

What is the output of this C code?
void main() { int x = 4; int p = &x; int k = p++; int r = p - k; printf("%d", r); }

What is the output of this C code?
int main() { int a = 1, b = 1, d = 1; printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++); }

What is the output of this C code?
int main() { int i = 0; int j = i++ + i; printf("%d\n", j); }