C Programming Questions and Answers - Precedence and Order of Evaluation - 2

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Precedence and Order of Evaluation – 2”.

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>
```
```
    int main()
```
```
    {
```
```
        int x = 2, y = 2;
```
```
        float f = y + x /= x / y;
```
```
        printf("%d %f\n", x, f);
```
```
        return 0;
```
```
    }
```

a) 2 4.000000
b) Compile time error
c) 2 3.500000
d) Undefined behaviour
View Answer

Answer: b
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 1, y = 2;
```
```
        if (x && y == 1)
```
```
            printf("true\n");
```
```
        else
```
```
            printf("false\n");
```
```
    }
```

a) true
b) false
c) compile time error
d) undefined behaviour
View Answer

Answer: b
Explanation: None.

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

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

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

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 3, y = 2;
```
```
        int z = x /= y %= 2;
```
```
        printf("%d\n", z);
```
```
    }
```

a) 1
b) Compile time error
c) Floating point exception
d) Segmentation fault
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 3, y = 2;
```
```
        int z = x << 1 > 5;
```
```
        printf("%d\n", z);
```
```
    }
```

a) 1
b) 0
c) 3
d) Compile time error
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 3; //, y = 2;
```
```
        const int *p = &x;
```
```
        *p++;
```
```
        printf("%d\n", *p);
```
```
    }
```

a) Increment of read-only location compile error
b) 4
c) Some garbage value
d) Undefined behaviour
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 2, y = 2;
```
```
        int z = x ^ y & 1;
```
```
        printf("%d\n", z);
```
```
    }
```

a) 1
b) 2
c) 0
d) 1 or 2
View Answer

Answer: b
Explanation: None.

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

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

a) 0
b) 1
c) Compile time error
d) 2
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 0, y = 2;
```
```
        if (!x && y)
```
```
            printf("true\n");
```
```
        else
```
```
            printf("false\n");
```
```
    }
```

a) True
b) False
c) Compile time error
d) Undefined behaviour
View Answer

Answer: a
Explanation: None.

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

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

a) -1
b) 2
c) 0
d) Compile time error
View Answer

Answer: b
Explanation: None.

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