Harman interview prep

5 practice questions on the topics candidates reported from Harman interviews, with answers. The questions are ours; each one links to the interview report that names its topic.

Practise them as a timed round 9 roles open at HARMAN India

C and C++ 3

C and C++Medium

What does this print?
```
#include <stdio.h>

int main(void) {
    int a[5] = {100, 200, 300, 400, 500};
    int *p = a;
    ++*p;
    printf("%d %d ", a[0], *p);
    p = a;
    *++p;
    printf("%d", *p);
    return 0;
}
```
1. 101 101 200
2. 100 200 200
3. 101 101 101
4. 100 101 300
Show the answer

A. 101 101 200

++*p increments the value p points at, so a[0] becomes 101. *++p moves the pointer first, to a[1], then reads it (the read is unused), so *p is 200.

This topic is named in a candidate’s interview report: C developer interview, Bengaluru, 2023, on LeetCode.
C and C++Medium

What does this print?
```
#include <stdio.h>
#include <string.h>

int main(void) {
    char s[] = "77.6;1778;NA;43";
    int n = 0;
    for (char *t = strtok(s, ";"); t; t = strtok(NULL, ";")) n++;
    printf("%d", n);
    return 0;
}
```
1. 1
2. 3
3. 4
4. 15
Show the answer

C. 4

strtok splits on ";" and returns one token per call: 77.6, 1778, NA and 43. It writes a \0 into the string at each delimiter, so it needs a writable array, not a string literal.

This topic is named in a candidate’s interview report: C developer interview, Bengaluru, 2023, on LeetCode.
C and C++Easy

What does this print?
```
#include <iostream>
#include <set>

int main() {
    std::set<char> a;
    a.insert('G');
    a.insert('F');
    a.insert('G');
    for (char c : a) std::cout << c << ' ';
}
```
1. G F G
2. F G
3. G F
4. F G G
Show the answer

B. F G

std::set keeps unique elements in sorted order, so the second G is ignored and F comes before G. std::multiset would keep both Gs; std::unordered_set has no defined order.

This topic is named in a candidate’s interview report: C developer interview, Bengaluru, 2023, on LeetCode.

Operating systems 2

Operating systemsMedium

Each line of employee.txt reads like "ajay manager account 45000". Which command prints only the lines whose second field is manager?
1. grep manager employee.txt
2. awk '$2 == "manager"' employee.txt
3. sort -k2 employee.txt
4. cut -d' ' -f2 employee.txt
Show the answer

B. awk '$2 == "manager"' employee.txt

awk splits each line into fields $1, $2, ... and prints the lines where the condition holds. grep would also match manager anywhere else in a line; cut prints only the field itself.

This topic is named in a candidate’s interview report: C developer interview, Bengaluru, 2023, on LeetCode.
Operating systemsMedium

Which command removes duplicate lines from a file while keeping the first copy of each in its original order?
1. uniq file.txt
2. awk '!seen[$0]++' file.txt
3. sort file.txt
4. wc -l file.txt
Show the answer

B. awk '!seen[$0]++' file.txt

seen[$0]++ is 0 the first time a line appears, so !0 prints it, and every later copy is skipped. uniq only removes adjacent duplicates, and sort -u removes them but changes the order.

This topic is named in a candidate’s interview report: C developer interview, Bengaluru, 2023, on LeetCode.

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C and C++ 3

What does this print?

What does this print?

What does this print?

Operating systems 2

Each line of employee.txt reads like "ajay manager account 45000". Which command prints only the lines whose second field is manager?

Which command removes duplicate lines from a file while keeping the first copy of each in its original order?

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