C 转换char为string的10种方法

std::string construtor

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using string class fill constructor
    std::string s(1, c);
    std::cout << s << '\n';
    return 0;
}

使用std::stringstream

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    char c = 'A';
    // using stringstream
    std::string s;
    std::stringstream ss;
    ss << c;
    ss >> s;                  // or s = ss.str();
    std::cout << s << '\n';
    return 0;
}

std::string::push_back

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using string::push_back
    std::string s;
    s.push_back(c);
    std::cout << s << '\n';
    return 0;
}

std::string::operator+=

string& operator+=(char c);

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::operator+=
    std::string s;
    s += c;
    std::cout << s << '\n';
    return 0;
}

std::string::operator=

string& operator+=(char c);

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::operator=
    std::string s;
    s = c;
    std::cout << s << '\n';
    return 0;
}

std::string::append

string& append(size_t n, char c);

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::append
    std::string s;
    s.append(1, c);
    std::cout << s << '\n';
    return 0;
}

std::string::assign

string& assign(size_t n, char c)

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::assign
    std::string s;
    s.assign(1, c);
    std::cout << s << '\n';
    return 0;
}

std::string::insert

string& insert(size_t pos, size_t n, char c)

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::insert
    std::string s;
    s.insert(0, 1, c);
    std::cout << s << '\n';
    return 0;
}

std::string::replace

string& replace(size_t pos, size_t len, size_t n, char c);

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // using std::string::replace
    std::string s;
    s.replace(0, 1, 1, c);
    std::cout << s << '\n';
    return 0;
}

转换char成为c-string

#include <iostream>
#include <string>
int main()
{
    char c = 'A';
    // converting char to c-string
    const char* str = &c;
    // using std::string fill constructor
    std::string s(str, 1);
    std::cout << s << '\n';
    // using std::string::append
    std::string S;
    S.append(str, 1);
    std::cout << S << '\n';
    // using std::string::assign
    S.assign(str, 1);
    std::cout << S << '\n';
    return 0;
}

参考资料: https://www.techiedelight.com/convert-char-to-string-cpp/