What will be the output of the following C++ code using strcat()? 

#include <iostream>
#include <cstring>
using namespace std;
int main() {
    char s1[10] = "Hi";
    char s2[] = "All";
    strcat(s1, s2);
    cout << s1;
    return 0;
}

Options

  • A. Hi
  • B. All
  • C. HiAll
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. HiAll

Detailed Explanation

Correct Answer: Option C — HiAll

Explanation: strcat() appends the C-style string s2 to the end of s1, including the characters before its terminating null character. The destination array has enough capacity for HiAll and its terminating null character.
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TRE4 C and C++ Quiz practice set 3

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