swap two parts of a string

[laura fidarova]

Q: " given a string. obtain another one by swapping the parts of the first one after the first entry of space"

so i guess it's like this:
input: basketball is a popular sport;
ootput: is a popular sport basketball;

how do i do that?

thanks in advance!)

[dutch]

Find the space with string::find, then create the new string using string::substr.
Look up those methods.

[seeplus]

#include <string>
#include <iostream>

int main()
{
	const std::string test {"basketball is a popular sport"};
	std::string test1 {test};

	const auto sp {test.find(' ')};

	if (sp != std::string::npos)
		test1.append(" ").append(test, 0, sp).erase(0, sp + 1);

	std::cout << test << '\n';
	std::cout << test1 << '\n';
}

basketball is a popular sport
is a popular sport basketball

[Repeater]

Just for the sheer fun of it, here's std::rotate.

#include <string>
#include <iostream>
#include <algorithm>

int main()
{
    const std::string test {"basketball is a popular sport"};
    auto test2{test};
    test2+=' ';
    std::rotate(test2.begin(), test2.begin() + test2.find(' '), test2.end());

    std::cout << test2;
}

[seeplus]

Nice. Close - but has a leading space.

#include <string>
#include <iostream>
#include <algorithm>

int main()
{
	const std::string test {"basketball is a popular sport"};
	auto test2 {test + ' '};

	std::rotate(test2.begin(), test2.begin() + test2.find(' ') + 1, test2.end());

	std::cout << test2;
}

[Repeater]

The instruction does say swap the parts AFTER the first space, which suggests that the first space shouldn't be going anywhere...

although the instruction also says nothing about adding a space on the end so that the last two words don't jam together.

To be honest, the instruction makes no sense whatsoever. This appears to also be a valid answer:

"basketball popular is sport a" All the parts after the first space have been swapped :/

[laura fidarova]

Thank you all so much for helping me, really appreciate it :)