Answer to Question #267538 in C++ for malika

Question

1. Rewrite the following function so that it does not use any square brackets (not even in the parameter declarations) but does use the integer variable k. Do not use any of the <cstring> functions such as strlen, strcpy, etc.

    // This function searches through str for the character chr.
    // If the chr is found, it returns a pointer into str where
    // the character was first found, otherwise nullptr (not found).

    const char* findTheChar(const char str[], char chr)
    {
        for (int k = 0; str[k] != 0; k++)
            if (str[k] == chr)
                return &str[k];

        return nullptr;
    }

1. Now rewrite the function shown in the previous so that it uses neither square brackets nor any integer variables. Your new function must not use any local variables other than the parameters. Do not use any of the <cstring> functions such as strlen, strcpy, etc.

Answer 1

1..

const char* findTheChar(const string &str,char chr)
    {
        for (int k = 0; str.length(); k++)
            if (str[k] == chr)
                return &str[k];
        return nullptr;
    }

2..

const char* findTheChar(const string &str,char chr)
    {
        for (auto &ch : str) {
            if (ch == chr)
                return &ch;
        }
        return nullptr;
    }