// Note: part of string funcs are defined in "tools/files.cpp"

#include <string>

#include <vector>

#include <sstream> // for "std::stringstream"

#include <iostream> // for "std::cout"

#define print(x) std::cout << x << std::endl

bool is_number(std::string &s) {

return s.find_first_not_of("0123456789") == std::string::npos;

}

std::string strConcat(std::vector<std::string> strVec)

{

std::stringstream stream;

for (auto s: strVec) {

stream << s;

}

return stream.str();

}

std::string zeroFmt(int num, int n)

{

// input: zeroFmt(4, 23); output: "0023"

std::string s = std::to_string(n);

if (num > s.length()) {

return std::string(num - s.length(), '0') + s;

} else {

return std::to_string(n);

}

}

int strFind()

{

std::string str ("There are two needles in this haystack with needles.");

std::string str2 ("needle");

// different member versions of find in the same order as above:

std::size_t found = str.find(str2);

if (found != std::string::npos)

print("first 'needle' found at: " << found);

found = str.find("needles are small", found + 1, 6);

if (found!=std::string::npos)

print("second 'needle' found at: " << found);

found = str.find("haystack");

if (found != std::string::npos)

print("'haystack' also found at: " << found);

found = str.find('.');

if (found != std::string::npos)

print("Period found at: " << found);

// let's replace the first needle:

str.replace(str.find(str2), str2.length(), "preposition");

std::cout << str << '\n';

return 0;

}

int main()

{

const char *e = "char";

std::string s = "string";

print(s + e); // can add them together

char buffer[100];

int age = 23;

sprintf(buffer, "my age is %d", age);

print(buffer);

std::string sbuffer(buffer);

std::string sbuffer1 = "my age is 23";

print(sbuffer.compare(sbuffer1)); // 0: equal / other number: not equal

bool aaa = true;

bool bbb = false;

bool ccc = !bbb;

print(!aaa); // 0 false

print(!bbb); // 1 true

print(!ccc << "\n---"); // 0 false

int xxx = 1;

int yyy = 0;

print(!xxx);

// Concate the string list altogether

// std::vector<std::string> sv = {"1920", "x", "1080"};

// std::string s1 = strConcat({1920, "x", 1080});

// print(s1.c_str());

// strFind();

return 0;

}