C If else Statement Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “If-then-else Statements – 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 = 1;
```
```
        if (x > 0)
```
```
            printf("inside if\n");
```
```
        else if (x > 0)
```
```
            printf("inside elseif\n");
```
```
    }
```

a) inside if
b) inside elseif
c)

inside if
inside elseif

d) compile time error
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 0;
```
```
        if (x++)
```
```
            printf("true\n");
```
```
        else if (x == 1)
```
```
            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 = 0;
```
```
        if (x == 1)
```
```
            if (x == 0)
```
```
                printf("inside if\n");
```
```
            else
```

                printf("inside else if\n");

```
        else
```
```
            printf("inside else\n");
```
```
    }
```

a) inside if
b) inside else if
c) inside else
d) compile time error
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 0;
```
```
        if (x == 0)
```
```
            printf("true, ");
```
```
        else if (x = 10)
```
```
            printf("false, ");
```
```
        printf("%d\n", x);
```
```
    }
```

a) false, 0
b) true, 0
c) true, 10
d) compile time error
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 0;
```
```
        if (x == 1)
```
```
            if (x >= 0)
```
```
                printf("true\n");
```
```
            else
```
```
                printf("false\n");
```
```
    }
```

a) true
b) false
c) Depends on the compiler
d) No print statement
View Answer

Answer: d
Explanation: None.

6. The C statement “”if (a == 1 || b == 2) {}”” can be re-written as ___________
a)

    if (a == 1)
    if (b == 2){}

    if (a == 1){}
    if (b == 2){}

    if (a == 1){}
    else if (b == 2){}

d) none of the mentioned
View Answer

Answer: d
Explanation: None.

7. Which of the following is an invalid if-else statement?
a) if (if (a == 1)){}
b) if (func1 (a)){}
c) if (a){}
d) if ((char) a){}
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1;
```
```
        if (a--)
```
```
            printf("True");
```
```
            if (a++)
```
```
                printf("False");
```
```
    }
```

a) True
b) False
c) True False
d) No Output
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a = 1;
```
```
        if (a)
```
```
            printf("All is Well ");
```
```
            printf("I am Well\n");
```
```
        else
```

            printf("I am not a River\n");

```
    }
```

a) Output will be All is Well I am Well
b) Output will be I am Well I am not a River
c) Output will be I am Well
d) Compile time errors during compilation
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        if (printf("%d", printf(")))
```
```
            printf("We are Happy");
```
```
        else if (printf("1"))
```
```
            printf("We are Sad");
```
```
    }
```

a) 0We are Happy
b) 1We are Happy
c) 1We are Sad
d) compile time error
View Answer

Answer: d
Explanation: None.

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