C++ - Using loops to Reverse a String With No Library Functions

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I have used while loop to find out the length of the string and for loop to reverse the string.

 

Source Code

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bool ReverseString(const char *src, char *dst, int len)

{

    const char *p = src;

 

    // count the length

    int count = 0;

    int i = 0;

    while(1)

    {

        if(p == NULL || *p == '\0' ||

            *p == '\t' || *p =='\n' || *p == '\r')

        {

            count = i;

            break;

        }

        p++;

        i++;

    }

 

    if(count > len)

    {

        return false; // Insufficient memory in the destination pointer

    }

 

    int k = 0;

    for(int j = count - 1; j >= 0; j--)

    {

        dst[k++] = src[j];

    }

    dst[k] = '\0';

 

    return true;

}

 

 

int main()

{

 

    char src[] = "Kathir";

    char dst[32];

    ReverseString(src, dst, 32);

    std::cout << src << "\n" << dst << "\n";

   return 0;

}

 

Output

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Kathir
rihtaK

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