C MCQ set number 00686

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    const int a = 1,  b = 2;
```
```
    int main()
```
```
    {
```
```
        int x = 1;
```
```
        switch (x)
```
```
        {
```
```
        case a:
```
```
            printf("yes ");
```
```
        case b:
```
```
            printf("non");
```
```
            break;
```
```
        }
```
```
    }
```

a) yes no
b) yes
c) no
d) Compile time error

Answer

Answer: d [Reason:] None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    #define max(a) a
```
```
    int main()
```
```
    {
```
```
        int x = 1;
```
```
        switch (x)
```
```
        {
```
```
        case max(2):
```
```
            printf("yesn");
```
```
        case max(1):
```
```
            printf("non");
```
```
            break;
```
```
        }
```
```
    }
```

a) yes no
b) yes
c) no
d) Compile time error

Answer

Answer: c [Reason:] None.

3. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        switch (printf("Do"))
```
```
        {
```
```
        case 1:
```
```
            printf("Firstn");
```
```
            break;
```
```
        case 2:
```
```
            printf("Secondn");
```
```
            break;
```
```
        default:
```
```
            printf("Defaultn");
```
```
            break;
```
```
        }
```
```
    }
```

a) Do
b) DoFirst
c) DoSecond
d) DoDefault

Answer

Answer: c [Reason:] None.

4. Comment on the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1;
```
```
        switch (a)
```
```
        case 1:
```
```
            printf("%d", a);
```
```
        case 2:
```
```
            printf("%d", a);
```
```
        case 3:
```
```
            printf("%d", a);
```
```
        default:
```
```
            printf("%d", a);
```
```
    }
```

a) No error, output is 1111
b) No error, output is 1
c) Compile time error, no break statements
d) Compile time error, case label outside switch statement

Answer

Answer: d [Reason:] None.

5. Switch statement accepts.
a) int
b) char
c) long
d) all of the mentioned

Answer

Answer: d [Reason:] None.

6. Comment on the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1;
```
```
        switch (a)
```
```
        {
```
```
        case a:
```
```
            printf("Case A ");
```
```
        default:
```
```
            printf("Default");
```
```
        }
```
```
    }
```

a) Output: Case A
b) Output: Default
c) Output: Case A Default
d) Compile time error

Answer

Answer: d [Reason:] None.

7. Comment on the output of this C code?

```
    #include <stdio.h>
```
```
    switch (ch)
```
```
    {
```
```
    case 'a':
```
```
    case 'A':
```
```
        printf("true");
```
```
    }
```

a) if (ch == ‘a’ && ch == ‘A’) printf(“true”);
b) if (ch == ‘a’)
if (ch == ‘a’) printf(“true”);
c) if (ch == ‘a’ || ch == ‘A’) printf(“true”);
d) none of the mentioned

Answer

Answer: c [Reason:] None.

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