write a program to replace each blank space with '#'

Answer 1

Oh yeah

Answer 2

#include <iostream>
#include <string>

using namespace std;

int main()
{
int pos;
string str = "I really love cake";
while (pos != -1)
{
pos = -1;
pos = str.find(' ');
if(pos != -1)
str.replace(pos, 1, "#");
}
cout << "New string: " << str;
return 0;
}

This completely works, probably a more efficient way, but that's how I would have done it☺

If you want to have the user input their own string, just use:

getline(cin, str);