Operators MCQ in C - Sanfoundry

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Assignment Operators & Expressions – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        if (x = 0)
```
```
            printf("Its zero\n");
```
```
        else
```
```
            printf("Its not zero\n");
```
```
    }
```

a) Its not zero
b) Its zero
c) Run time error
d) None
View Answer

Answer: a
Explanation: In the above C code, we assign a zero value to the variable x. In the if condition, we are reassigning a value of zero to x. Remember, we are “NOT” comparing its values to zero (you can see that it is a single ‘=’ sign, it’s not a double ‘==’ sign). Hence, the if-condition becomes false and the printf() function of the else condition will be executed which will display “Its not zero”.

2. What will be the output of the following C code?

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```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int k = 8;
```
```
        int x = 0 == 1 && k++;
```
```
        printf("%d%d\n", x, k);
```
```
    }
```

a) 0 9
b) 0 8
c) 1 8
d) 1 9
View Answer

Answer: b
Explanation: None.

3. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char a = 'a';
```
```
        int x = (a % 10)++;
```
```
        printf("%d\n", x);
```
```
    }
```

a) 6
b) Junk value
c) Compile time error
d) 7
View Answer

Answer: c
Explanation: None.

4. What will be the output of the following C code snippet?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        1 < 2 ? return 1: return 2;
```
```
    }
```

a) returns 1
b) returns 2
c) Varies
d) Compile time error
View Answer

Answer: d
Explanation: None.

5. What will be the output of the following C code snippet?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        unsigned int x = -5;
```
```
        printf("%d", x);
```
```
    }
```

a) Run time error
b) Aries
c) -5
d) 5
View Answer

Answer: c
Explanation: None.

6. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 2, y = 1;
```
```
        x *= x + y;
```
```
        printf("%d\n", x);
```
```
        return 0;
```
```
    }
```

a) 5
b) 6
c) Undefined behaviour
d) Compile time error
View Answer

Answer: b
Explanation: None.

7. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 2, y = 2;
```
```
        x /= x / y;
```
```
        printf("%d\n", x);
```
```
        return 0;
```
```
    }
```

a) 2
b) 1
c) 0.5
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

8. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 1, y = 0;
```
```
        x &&= y;
```
```
        printf("%d\n", x);
```
```
    }
```

a) Compile time error
b) 1
c) 0
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

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