Increment & Decrement Operators - C Programming Questions and Answers

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

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

1. What is the difference between the following 2 codes?

```
    #include <stdio.h> //Program 1
```
```
    int main()
```
```
    {
```
```
        int d, a = 1, b = 2;
```
```
        d =  a++ + ++b;
```
```
        printf("%d %d %d", d, a, b);
```
```
    }
```

```
    #include <stdio.h> //Program 2
```
```
    int main()
```
```
    {
```
```
        int d, a = 1, b = 2;
```
```
        d =  a++ +++b;
```
```
        printf("%d %d %d", d, a, b);
```
```
    }
```

a) No difference as space doesn’t make any difference, values of a, b, d are same in both the case
b) Space does make a difference, values of a, b, d are different
c) Program 1 has syntax error, program 2 is not
d) Program 2 has syntax error, program 1 is not
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1, b = 1, c;
```
```
        c = a++ + b;
```
```
        printf("%d, %d", a, b);
```
```
    }
```

a) a = 1, b = 1
b) a = 2, b = 1
c) a = 1, b = 2
d) a = 2, b = 2
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1, b = 1, d = 1;
```

        printf("%d, %d, %d", ++a + ++a+a++, a++ + ++b, ++d + d++ + a++);

```
    }
```

a) 15, 4, 5
b) 9, 6, 9
c) 9, 3, 5
d) Undefined (Compiler Dependent)
View Answer

Answer: d
Explanation: None.

4. For which of the following, “PI++;” code will fail?
a) #define PI 3.14
b) char *PI = “A”;
c) float PI = 3.14;
d) none of the Mentioned
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 10, b = 10;
```
```
        if (a = 5)
```
```
        b--;
```
```
        printf("%d, %d", a, b--);
```
```
    }
```

a) a = 10, b = 9
b) a = 10, b = 8
c) a = 5, b = 9
d) a = 5, b = 8
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        int j = i++ + i;
```
```
        printf("%d\n", j);
```
```
    }
```

a) 0
b) 1
c) 2
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 i = 2;
```
```
        int j = ++i + i;
```
```
        printf("%d\n", j);
```
```
    }
```

a) 6
b) 5
c) 4
d) Compile time error
View Answer

Answer: a
Explanation: None.

8. Comment on the behaviour of the following C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 2;
```
```
        i = i++ + i;
```
```
        printf("%d\n", i);
```
```
    }
```

a) = operator is not a sequence point
b) ++ operator may return value with or without side effects
c) it can be evaluated as (i++)+i or i+(++i)
d) = operator is a sequence point
View Answer

Answer: a
Explanation: None.

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