250+ TOP MCQs on Static Variables and Answers

Posted on April 16, 2024April 16, 2024 by engineerLeave a comment

C programming questions on “Static Variables” along with answers, explanations and/or solutions:

1. What will be the output of the following C code if these two files namely test.c and test1.c are linked and run?

```
      -------file test.c-------
```
```
    #include 
```
```
    #include ""test.h""
```
```
    int main()
```
```
    {
```
```
        i = 10;
```
```
        printf(""%d "", i);
```
```
        foo();
```
```
    }
```
```
    -----file test1.c------
```
```
    #include 
```
```
    #include ""test.h""
```
```
    int foo()
```
```
    {
```
```
        printf(""%dn"", i);
```
```
    }
```
```
    -----file test.h-----
```
```
    #include 
```
```
    #include 
```
```
    static int i;
```

a) 10 0
b) 0 0
c) 10 10
d) Compilation Error

Answer: a
Clarification: None.

2. Functions have static qualifier for its declaration by default.
a) True
b) False
c) Depends on the compiler
d) Depends on the standard

Answer: b
Clarification: None.

3. Is initialisation mandatory for local static variables?
a) Yes
b) No
c) Depends on the compiler
d) Depends on the standard

Answer: b
Clarification: None.

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

```
    #include 
```
```
    int main()
```
```
    {
```
```
        foo();
```
```
        foo();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        int i = 11;
```
```
        printf("%d ", i);
```
```
        static int j = 12;
```
```
        j = j + 1;
```
```
        printf("%dn", j);
```
```
    }
```

a) 11 12 11 12
b) 11 13 11 14
c) 11 12 11 13
d) Compile time error

Answer: b
Clarification: None.

5. Assignment statements assigning value to local static variables are executed only once.
a) True
b) False
c) Depends on the code
d) None of the mentioned

Answer: b
Clarification: None.

6. What is the format identifier for “static a = 20.5;”?
a) %s
b) %d
c) %f
d) Illegal declaration due to absence of data type

Answer: b
Clarification: None.

7. Which of the following is true for the static variable?
a) It can be called from another function
b) It exists even after the function ends
c) It can be modified in another function by sending it as a parameter
d) All of the mentioned

Answer: b
Clarification: None.

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

```
    #include 
```
```
    void func();
```
```
    int main()
```
```
    {
```
```
        static int b = 20;
```
```
        func();
```
```
    }
```
```
    void func()
```
```
    {
```
```
        static int b;
```
```
        printf("%d", b);
```
```
    }
```

a) Output will be 0
b) Output will be 20
c) Output will be a garbage value
d) Compile time error due to redeclaration of static variable

Answer: a
Clarification: None.

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