Write a C++ program that displays a Letter Pyramid from a user-provided std::string. Prompt the user to enter a std::string and then from that string display a Letter Pyramid as follows: It's much easier to understand the Letter Pyramid given examples.
#include <iostream>
#include <string>
using namespace std;
int main() {
string user_input {}, pyra {""}, space (user_input.length() - 1, ' ');
cout << "Please enter a sequence of characters... ";
cin >> user_input;
for (size_t i{0}; i < user_input.length(); ++i) {
pyra = user_input.substr(0, i + 1);
cout << space << pyra;
if (pyra.length() == 1) {
cout << space;
} else {
for (auto j {pyra.length()}; j > 0; --j) {
cout << pyra.at(j);
}
}
space.erase(0, 1);
cout << endl;
}
return 0;
}