Formatted Output - C Interview Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Formatted Output – 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>
```
```
    int main()
```
```
    {
```
```
        int i = 10, j = 2;
```

        printf("%d\n", printf("%d %d ", i, j));

```
    }
```

a) Compile time error
b) 10 2 4
c) 10 2 2
d) 10 2 5
View Answer

Answer: d
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 10, j = 3;
```
```
        printf("%d %d %d", i, j);
```
```
    }
```

a) Compile time error
b) 10 3
c) 10 3 some garbage value
d) Undefined behaviour
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int i = 10, j = 3, k = 3;
```
```
        printf("%d %d ", i, j, k);
```
```
    }
```

a) Compile time error
b) 10 3 3
c) 10 3
d) 10 3 somegarbage value
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        char *s = "myworld";
```
```
        int i = 9;
```
```
        printf("%*s", i, s);
```
```
    }
```

a) myworld
b) myworld(note: spaces to the left of myworld)
c) myworld (note:followed by two spaces after myworld)
d) Undefined
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main(int argc, char** argv)
```
```
    {
```
```
        char *s = "myworld";
```
```
        int i = 3;
```
```
        printf("%10.*s", i, s);
```
```
    }
```

a) myw(note:7 spaces before myw)
b) myworld(note:2 spaces before myworld)
c) myworld (note:2 spaces after myworld)
d) myw(note:6 spaces after myw)
View Answer

Answer: a
Explanation: In the format represented by “%10.*s”, the width of the string will be 10 spaces which is aligned to the right, by default. Since we have asterisk (*) after the precision dot (.), the value of precision will be the value stored in the variable i. The value of i is 3, so this signifies max length of the string as 3 characters. So, the final formatted output will be a 10 character output with 3 characters “myw” printed with right alignment and the 1st 7 characters will be simply space characters.

6. What is the difference between %e and %g?
a) %e output formatting depends on the argument and %g always formats in the format [-]m.dddddd or [-]m.dddddE[+|-]xx where no.of ds are optional
b) %e always formats in the format [-]m.dddddd or [-]m.dddddE[+|-]xx where no.of ds are optional and output formatting depends on the argument
c) No differences
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

7. Escape sequences are prefixed with ________
a) %
b) /
c) ”
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

8. What is the purpose of sprintf?
a) It prints the data into stdout
b) It writes the formatted data into a string
c) It writes the formatted data into a file
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

9. The syntax to print a % using printf statement can be done by ________
a) %
b) \%
c) ‘%’
d) %%
View Answer

Answer: d
Explanation: None.

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