Online C Test - While Loops - CCN, CDAC, CGI

This section on online C test focuses on “While Loops”. One shall practice these test questions to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our online C test questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of online C test questions on “While Loops” along with answers, explanations and/or solutions:

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        while ()
```
```
            printf("In while loop ");
```
```
        printf("After loop\n");
```
```
    }
```

a) In while loop after loop
b) After loop
c) Compile time error
d) Infinite loop
View Answer

Answer: c
Explanation: None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        do
```
```
            printf("In while loop ");
```
```
        while (0);
```
```
            printf("After loop\n");
```
```
    }
```

a) In while loop
b) In while loop
after loop
c) After loop
d) Infinite loop
View Answer

Answer: b
Explanation: None.

3. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        do {
```
```
            i++;
```
```
            printf("In while loop\n");
```
```
        } while (i < 3);
```
```
    }
```

a) In while loop
In while loop
In while loop
b) In while loop
In while loop
c) Depends on the compiler
d) Compile time error
View Answer

Answer: a
Explanation: None.

4. How many times i value is checked in the below code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        do {
```
```
            i++;
```
```
            printf("in while loop\n");
```
```
        } while (i < 3);
```
```
    }
```

a) 2
b) 3
c) 4
d) 1
View Answer

Answer: b
Explanation: None.

5. How many times i value is checked in the below code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 0;
```
```
        while (i < 3)
```
```
            i++;
```
```
        printf("In while loop\n");
```
```
    }
```

a) 2
b) 3
c) 4
d) 1
View Answer

Answer: c
Explanation: None.

6. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int i = 2;
```
```
        do
```
```
        {
```
```
            printf("Hi");
```
```
        } while (i < 2)
```
```
    }
```

a) Compile time error
b) Hi Hi
c) Hi
d) Varies
View Answer

Answer: a
Explanation: None.

7. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int i = 0;
```
```
        while (++i)
```
```
        {
```
```
            printf("H");
```
```
        }
```
```
    }
```

a) H
b) H is printed infinite times
c) Compile time error
d) Varies
View Answer

Answer: b
Explanation: None.

8. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        int i = 0;
```
```
        do
```
```
        {
```
```
            printf("Hello");
```
```
        } while (i != 0);
```
```
    }
```

a) Nothing
b) H is printed infinite times
c) Hello
d) Run time error
View Answer

Answer: c
Explanation: None.

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