If-then-else Statement - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “If-then-else Statements – 1”.

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>
```
```
    void main()
```
```
    {
```
```
        int x = 5;
```
```
        if (x < 1)
```
```
            printf("hello");
```
```
        if (x == 5)
```
```
            printf("hi");
```
```
        else
```
```
            printf("no");
```
```
    }
```

a) hi
b) hello
c) no
d) error
View Answer

Answer: a
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int x;
```
```
    void main()
```
```
    {
```
```
        if (x)
```
```
            printf("hi");
```
```
        else
```
```
            printf("how are u");
```
```
    }
```

a) hi
b) how are you
c) compile time error
d) error
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 5;
```
```
        if (true);
```
```
            printf("hello");
```
```
    }
```

a) It will display hello
b) It will throw an error
c) Nothing will be displayed
d) Compiler dependent
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        if (x == 0)
```
```
            printf("hi");
```
```
        else
```
```
            printf("how are u");
```
```
            printf("hello");
```
```
    }
```

a) hi
b) how are you
c) hello
d) hihello
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int x = 5;
```
```
        if (x < 1);
```
```
            printf("Hello");
```
```
 
```
```
    }
```

a) Nothing
b) Run time error
c) Hello
d) Varies
View Answer

Answer: c
Explanation: None.

6. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        double ch;
```

        printf("enter a value between 1 to 2:");

```
        scanf("%lf", &ch);
```
```
        switch (ch)
```
```
        {
```
```
           case 1:
```
```
             printf("1");
```
```
             break;
```
```
           case 2:
```
```
             printf("2");
```
```
             break;
```
```
        }
```
```
    }
```

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

Answer: a
Explanation: None.

7. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *ch;
```

        printf("enter a value between 1 to 3:");

```
        scanf("%s", ch);
```
```
        switch (ch)
```
```
        {
```
```
           case "1":
```
```
              printf("1");
```
```
              break;
```
```
           case "2":
```
```
              printf("2");
```
```
              break;
```
```
        }
```
```
    }
```

a) 1
b) 2
c) Compile time error
d) No Compile time error
View Answer

Answer: c
Explanation: None.

8. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int ch;
```

        printf("enter a value between 1 to 2:");

```
        scanf("%d", &ch);
```
```
        switch (ch)
```
```
        {
```
```
           case 1:
```
```
              printf("1\n");
```
```
           default:
```
```
              printf("2\n");
```
```
        }
```
```
    }
```

a) 1
b) 2
c) 1 2
d) Run time error
View Answer

Answer: c
Explanation: None.

9. What will be the output of the following C code? (Assuming that we have entered the value 2 in the standard input)

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int ch;
```

        printf("enter a value between 1 to 2:");

```
        scanf("%d", &ch);
```
```
        switch (ch)
```
```
        {
```
```
           case 1:
```
```
              printf("1\n");
```
```
              break;
```
```
              printf("Hi");
```
```
           default:
```
```
              printf("2\n");
```
```
        }
```
```
    }
```

a) 1
b) Hi 2
c) Run time error
d) 2
View Answer

Answer: d
Explanation: None.

10. What will be the output of the following C code? (Assuming that we have entered the value 1 in the standard input)

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int ch;
```

        printf("enter a value between 1 to 2:");

```
        scanf("%d", &ch);
```
```
        switch (ch, ch + 1)
```
```
        {
```
```
           case 1:
```
```
              printf("1\n");
```
```
              break;
```
```
           case 2:
```
```
              printf("2");
```
```
              break;
```
```
        }
```
```
    }
```

a) 1
b) 2
c) 3
d) Run time error
View Answer

Answer: b
Explanation: None.

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