C/C /C Multiple Choice Questions C Operators Sample Test,Sample questions

Question:
 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++);
    }

1.15, 4, 5

2.9, 6, 9

3. 9, 3, 5

4.6, 4, 6


Question:
 What is the output of this C code?

    int main()
    {
        int a = 20, b = 15, c = 5;
        int d;
        d = a == (b + c);
        printf("%d", d);
    }
A. 1

1.1

2. 40

3.10

4.5


Question:
 What is the output of this C code?

    int main()
    {
        int a = 20;
        double b = 15.6;
        int c;
        c = a + b;
        printf("%d", c);
    }

1.35

2.36

3.35.6

4.30


Question:
 What is the output of this C code?

    void main()
    {
        char a = 'a';
        int x = (a % 10)++;
        printf("%d
", x);
    }

1.6

2.Junk value

3.Compile time error

4.7


Question:
 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);
    }

1.4

2.8

3.1

4.Run time error


Question:
Are logical operators sequence points?

1.True

2.False

3.Depends on the compiler

4.Depends on the standard


Question:
Comment on the output of this C code?

    int main()
    {
        int i = 2;
        int i = i++ + i;
        printf("%d
", i);
    }

1.= operator is not a sequence point

2.++ operator may return value with or without side effects

3. it can be evaluated as (i++)+i or i+(++i)

4.Both a and b


Question:
Comment on the output of this C code?

    int main()
    {
        int i, n, a = 4;
        scanf("%d", &n);
        for (i = 0; i < n; i++)
            a = a * 2;
    }

1.Logical Shift left

2.No output

3.Arithmetic Shift right

4.bitwise exclusive OR


Question:
Does logical operators in C language are evaluated with short circuit?

1.True

2.False

3.Depends on the compiler

4.depends on the standard


Question:
for c = 2, value of c after c <<= 1;

1.c = 1;

2. c = 2;

3.c = 3;

4. c = 4;


Question:
For which of the following, "PI++; code will fail?

1.#define PI 3.14

2.char *PI = A";

3.float PI = 3.14;

4.Both (A) and (B)


Question:
Operation "a = a * b + a can also be written as:

1. a *= b + 1

2.(c = a * b)!=(a = c + a)

3.a = (b + 1)* a;

4.All of the mentioned


Question:
Relational operators cannot be used on:

1.structure

2.long

3.strings

4.float


Question:
Result of a logical or relational expression in C is?

1.True or False

2.0 or 1

3.0 if expression is false and any positive number if expression is true

4.None of the mentioned


Question:
The precedence of arithmetic operators is (from highest to lowest)?

1.%, *, /, +, -

2.%, +, /, *, -

3. +, -, %, *, /

4.%, +, -, *, /


Question:
What is the difference between the following 2 codes?

//Program 1
    int main()
    {
        int d, a = 1, b = 2;
        d =  a++ + ++b;
        printf("%d %d %d", d, a, b);
    }


 //Program 2
    int main()
    {
        int d, a = 1, b = 2;
        d =  a++ + ++b;
        printf("%d %d %d", d, a, b);
    }

1.No difference as space doesn't make any difference, values of a, b, d are same in both the case

2.No difference as space doesn't make any difference, values of a, b, d are different

3.Program 1 has syntax error, program 2 is not

4.Program 2 has syntax error, program 1 is not


Question:
What is the final value of j in the below code?

    int main()
    {
        int i = 0, j = 0;
        if (i && (j = i + 10))
            //do something
            ;
    }

1.0

2.10

3.Depends on the compiler

4.Depends on language standard


Question:
What is the output of this C code?


    int main()
    {
        int i = 0;
        int x = i++, y = ++i;
        printf("%d % d
", x, y);
        return 0;
    }

1.0, 2

2.0, 1

3.1, 2

4.Undefined


Question:
What is the output of this C code?

    int main()
    {
        if (7 & 8)
        printf("Honesty");
            if ((~7 & 0x000f) == 8)
                printf("is the best policy
");
    }

1.Honesty is the best policy

2.Honesty

3.is the best policy

4. No output


Question:
What is the output of this C code?

    int main()
    {
        if (~0 == 1)
            printf("yes
");
        else
            printf("no
");
    }

1.Yes

2.No

3.Compile time error

4.undefined


Question:
What is the output of this C code?

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

1.a = 1, b = 1

2.a = 2, b = 1

3.a = 1, b = 2

4. a = 2, b = 2


Question:
What is the output of this C code?

    int main()
    {
        int a = 1, b = 2;
        a += b -= a;
        printf("%d %d", a, b);
    }

1.1 1

2.1 2

3. 2 1

4.2 2


Question:
What is the output of this C code?

    int main()
    {
        int a = 10, b = 10;
        if (a = 5)
        b--;
        printf("%d, %d", a, b--);
    }

1.a = 10, b = 9

2.a = 10, b = 8

3.a = 5, b = 9

4.a = 5, b = 8


Question:
What is the output of this C code?

    int main()
    {
        int a = 10, b = 5, c = 3;
        b != !a;
        c = !!a;
        printf("%d	%d", b, c);
    }

1.5 1

2.0 3

3.5 3

4.1 1


Question:
What is the output of this C code?

    int main()
    {
        int a = 10;
        if (a == a--)
            printf("TRUE 1	");
        a = 10;
        if (a == --a)
            printf("TRUE 2	");
    }

1.TRUE 1

2.TRUE 2

3.TRUE 1 TRUE 2

4.No output


Question:
What is the output of this C code?

    int main()
    {
        int a = 2;
        if (a >> 1)
           printf("%d
", a);
    }

1.0

2.1

3.2

4.No output


Question:
What is the output of this C code?

    int main()
    {
        int a = 2;
        if (a >> 1)
           printf("%d
", a);
    }

1.0

2.0

3.1

4.No output


Question:
What is the output of this C code?

    int main()
    {
        int a = 4, n, i, result = 0;
        scanf("%d", n);
        for (i = 0;i < n; i++)
        result += a;
    }

1.Addition of a and n

2.Subtraction of a and n.

3.Multiplication of a and n

4.Division of a and n.


Question:
What is the output of this C code?

    int main()
    {
        int c = 2 ^ 3;
        printf("%d
", c);
    }

1.1

2.8

3.9

4.0


Question:
What is the output of this C code?

    int main()
    {
        int i = -5;
        int k = i %4;
        printf("%d
", k);
    }

1. Compile time error

2.-1

3.1

4.None


Question:
What is the output of this C code?

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

1.0

2.1

3.2

4.Compile time error


Question:
What is the output of this C code?

    int main()
    {
        int i = 10;
        int *p = &i;
        printf("%d
", *p++);
    }

1.10

2.11

3.Garbage value

4.Address of i


Question:
What is the output of this C code?

    int main()
    {
        int i = 1;
        if (i++ && (i == 1))
            printf("Yes
");
        else
            printf("No
");
    }

1.Yes

2.No

3.Depends on the compiler

4.Depends on the standard


Question:
What is the output of this C code?

    int main()
    {
        int i = 2;
        int j = ++i + i;
        printf("%d
", j);
    }

1.6

2.5

3.4

4.Compile time error


Question:
What is the output of this C code?

    int main()
    {
        int i = 5;
        int l = i / -4;
        int k = i % -4;
        printf("%d %d
", l, k);
        return 0;
    }

1.Compile time error

2. -1 1

3.1 -1

4.Run time error


Question:
What is the output of this C code?

    int main()
    {
        int i = 7;
        i = i / 4;
        printf("%d
", i);
       return 0;
    }

1.Run time error

2.1

3.3

4.Compile time error


Question:
What is the output of this C code?

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

1.Yes

2.No

3.Run time error

4.undefined


Question:
What is the output of this C code?

    int main()
    {
        int x = -2;
        x = x >> 1;
        printf("%d
", x);
    }

1.1

2. -1

3. 2 ^ 31 "“ 1 considering int to be 4 bytes

4.Either (b) or (c)


Question:
What is the output of this C code?

    int main()
    {
        int x = 1, y = 0, z = 3;
        x > y ? printf("%d", z) : return z;
    }

1.3

2.1

3.Compile time error

4.Run time error


Question:
What is the output of this C code?

    int main()
    {
        int x = 2, y = 1;
        x *= x + y;
        printf("%d
", x);
        return 0;
    }

1.5

2.6

3.Undefined behaviour

4.Compile time error


Question:
What is the output of this C code?

    int main()
    {
        int x = 2, y = 2;
        x /= x / y;
        printf("%d
", x);
        return 0;
    }

1.2

2.1

3.0.5

4.Undefined behaviour


Question:
What is the output of this C code?

    int main()
    {
        int x = 2;
        x = x << 1;
        printf("%d
", x);

1.4

2.1

3.Depends on the compiler

4.Depends on the endianness of the machine


Question:
What is the output of this C code?

    int main()
    {
        int y = 0;
        if (1 |(y = 1))
            printf("y is %d
", y);
        else
            printf("%d
", y);
 
    }

1.1

2.0

3.Run time error

4.undefined


Question:
What is the output of this C code?

    int main()
    {
        int y = 1;
        if (y & (y = 2))
            printf("true %d
");
        else
            printf("false %d
");
 
    }

1.true 2

2.false 2

3. Either option a or option b

4.true 1


Question:
What is the output of this C code?

    int main()
    {
        unsigned int a = 10;
        a = ~a;
        printf("%d
", a);
    }

1.-9

2.-10

3.-11

4.10


Question:
What is the output of this C code?

    void main()
    {
        1 < 2 ? return 1: return 2;
    }

1.returns 1

2.returns 2

3.varies

4.Compile time error


Question:
What is the output of this C code?

    void main()
    {
        int a = -5;
        int k = (a++, ++a);
        printf("%d
", k);
    }

1.-3

2.-5

3.4

4.Undefined


Question:
What is the output of this C code?

    void main()
    {
        int a = -5;
        int k = (a++, ++a);
        printf("%d
", k);
    }
A. -4B. -5C. 4D. -3

1.4

2.8

3.1

4.Run time error


Question:
What is the output of this C code?

    void main()
    {
        int a = 5, b = -7, c = 0, d;
        d = ++a && ++b || ++c;
        printf("
%d%d%d%d", a,  b, c, d);
    }

1.6 -6 0 0

2.6 -5 0 1

3.-6 -6 0 1

4. 6 -6 0 1


Question:
What is the output of this C code?

    void main()
    {
        int a = 5, b = -7, c = 0, d;
        d = ++a && ++b || ++c;
        printf("
%d%d%d%d", a, b, c, d);
    }

1.6 -6 0 0

2.6 -5 0 1

3.-6 -6 0 1

4.6 -6 0 1


Question:
What is the output of this C code?

    void main()
    {
        int a = 5;
        int b = ++a + a++ + --a;
        printf("Value of b is %d", b);
    }

1. Value of x is 16

2.Value of x is 21

3.Value of x is 15

4.Undefined behaviour


Question:
What is the output of this C code?

    void main()
    {
        int k = 8;
        int x = 0 == 1 && k++;
        printf("%d%d
", x, k);
    }

1.0 9

2. 0 8

3. 1 9

4. 1 8


Question:
What is the output of this C code?

    void main()
    {
        int x = 0, y = 2, z = 3;
        int a = x & y | z;
        printf("%d", a);
    }

1.3

2.0

3.2

4.Run time error


Question:
What is the output of this C code?

    void main()
    {
        int x = 0;
        if (x = 0)
            printf("Its zero
");
        else
            printf("Its not zero
");
    }

1.ts not zero

2. Its zero

3.Run time error

4.None


Question:
What is the output of this C code?

    void main()
    {
        int x = 1, y = 0, z = 5;
        int a = x && y && z++;
        printf("%d", z);
    }

1.6

2.5

3.0

4.Varies


Question:
What is the output of this C code?

    void main()
    {
        int x = 1, y = 0, z = 5;
        int a = x && y || z++;
        printf("%d", z);
    }

1.6

2.5

3.0

4.Varies


Question:
What is the output of this C code?

    void main()
    {
        int x = 1, z = 3;
        int y = x << 3;
        printf(" %d
", y);
    }

1.-2147483648

2.-1

3.Run time error

4. 8


Question:
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);
    }

1. 3 2 3

2. 2 3 3

3.3 2 .3

4. 2 3 4


Question:
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);
    }

1.3 2 3

2.2 2 3

3.3 2 2

4.2 3 3


Question:
What is the output of this C code?

    void main()
    {
        int x = 4.3 % 2;
        printf("Value of x is %d", x);
    }

1.Value of x is 1.3

2. Value of x is 2

3.Value of x is 0.3

4.Compile time error


Question:
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);
    }

1.48

2.8

3.1

4.Run time error


Question:
What is the output of this C code?

    void main()
    {
        int x = 97;
        int y = sizeof(x++);
        printf("X is %d", x);
    }

1.X is 97

2. X is 94

3. X is 99

4.Run time error


Question:
What is the output of this C code?

    void main()
    {
        int x = 97;
        int y = sizeof(x++);
        printf("x is %d", x);
    }

1. x is 97

2. x is 98

3. x is 99

4.Run time error


Question:
What is the output of this C code?

    void main()
    {
        int y = 3;
        int x = 7 % 4 * 3 / 2;
        printf("Value of x is %d", x);
    }

1.Value of x is 1

2.Value of x is 2

3.Value of x is 3

4.Compile time error


Question:
What is the output of this C code?

    void main()
    {
        unsigned int x = -5;
        printf("%d", x);
    }

1.Run time error

2.Varies

3.-5

4.5


Question:
What is the output of this C code?

    void main()
    {
        unsigned int x = -5;
        printf("%d", x);
    }

1.Run time error

2.Varies

3.-5

4.5


Question:
What is the type of the below assignment expression if x is of type float, y is of type int?
        y = x + y;

1. int

2. float

3.There is no type for an assignment expression

4.double


Question:
What is the value of the below assignment expression
      (x = foo())!= 1 considering foo() returns 2

1.2

2.True

3.1

4.0


Question:
What is the value of x in this C code?

    void main()
    {
        int x = 4 *5 / 2 + 9;
    }

1.6.75

2.1.85

3.19

4.3


Question:
What will be the value of d in the following program?

    int main()
    {
        int a = 10, b = 5, c = 5;
        int d;
        d = b + c == a;
        printf("%d", d);
    }
A

1.Syntax error

2.1

3.5

4.10


Question:
Which among the following is NOT a logical or relational operator?
A. !=B. ==C. ||D. =
Which among the following is NOT a logical or relational operator?

1.!=

2.==

3.||

4.=


Question:
Which of the following data type will throw an error on modulus operation(%)?

1.char

2.short

3.float

4.int


Question:
Which of the following is an invalid assignment operator?

1.a %= 10;

2. a /= 10

3.a |= 10

4.None of the mentioned


Question:
Which of the following is not an arithmetic operation?

1.a *= 20;

2.a /= 30;

3.a %= 40;

4.a != 50;


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