Solutions No. 001: EEG 206: Program that reverses a string

This is the program that we were told to do where you take input of a string and reverse it and then output it.

Code Notes: 

• I didn't use the "string.h" header since Engr. Mohammed did not teach it in class.
• The code I am posting works, but of course, due to compatiblity issues and plain old human error, things might go wrong. If and when they do go wrong, post a comment below the relevant post or just contact me.
• The day Engr. Tunji Okewole taught us, he was supposed to take us some stuff  on strings but he didn't. The slide I posted previously contains this information. Please endeavour to read it to the end.
• I try to make my programs as efficient as possible, at times at the risk of simplicity; but I am not perfect, no one is. Please I'm begging you feel free to post suggestions for improvement.
• Also, I will use functions as much as possible since that's what the lecturer encourages.
• Please don't get frustrated. Remember murphy's law: Anything that can go wrong will go wrong.

Code Process:

1.  I created two character arrays (character arrays are also known as strings). One for input (original text you type in) and for ouput (the reversed text).
2. I used the "cin.getline" function to fill in the "input" character array with the string. Please check up on it.
3. Next, an int variable "num" is intitialized for counting the number of characters typed into the program (including spaces).
4. Then, the input and output arrays and also the num variable are passed into the function that does the real work (I use pointers to pass in num).
5. In the function, I assign a value to num by using a while loop which increments the variable from 0, till the character '\0' (end of string) is encountered.
6. And finally, I use a for loop to assign the last character of input to the first character of output, second-to-the-last to second of output, e.t.c.
7. We then leave the "ReverseIt()" function
8. And now, we have an output array with reversed letters, which is simply output using another for loop (back in the main() function).

And now, the code:

#include <iostream>

void ReverseIt(char[], char[], int*);

using namespace std;

int main()

{

cout << "This is a program that receives input of a string and reverses it" << endl;

char input[51] = {}, output[50] = {};

int num = 0, counter = 0;

char ans = 'y';

while ((ans == 'y') || (ans == 'Y'))

{

counter++;

cout << "\nPlease enter the string: ";

if (counter > 1)

cin.get();

cin.getline(input, 50, '\n');

ReverseIt(input, output, &num);

for (int i = 0; i <= num; i++)

cout << output[i];

cout << endl << "Would you like to do it again? (Y/N): "; cin >> ans;

cout << endl << endl;

}

return 0;

}

void ReverseIt(char input[], char output[], int* Pnum)

{

int n = 0;

while (input[n] != '\0')

n++;

*Pnum = n;

for (int i = 0; n >= 0; i++, n--)

output[i] = input[n];

}

* Download the code: ReverseIt

* Remember, arrays and for loops are conjoined twins. They go together everywhere.

* Download: EEG 206 slide