c-resources/CPlusPlus20ForProgrammers-m.../examples/ch08/fig08_02.cpp

63 lines
2.2 KiB
C++

// fig08_02.cpp
// Comparing strings.
#include <fmt/format.h>
#include <iostream>
#include <string>
void displayResult(const std::string& s, int result) {
if (result == 0) {
std::cout << fmt::format("{} == 0\n", s);
}
else if (result > 0) {
std::cout << fmt::format("{} > 0\n", s);
}
else { // result < 0
std::cout << fmt::format("{} < 0\n", s);
}
}
int main() {
const std::string s1{"Testing the comparison functions."};
const std::string s2{"Hello"};
const std::string s3{"stinger"};
const std::string s4{s2}; // "Hello"
std::cout << fmt::format("s1: {}\ns2: {}\ns3: {}\ns4: {}",
s1, s2, s3, s4);
// comparing s1 and s4
if (s1 > s4) {
std::cout << "\n\ns1 > s4\n";
}
// comparing s1 and s2
displayResult("s1.compare(s2)", s1.compare(s2));
// comparing s1 (elements 2-6) and s3 (elements 0-4)
displayResult("s1.compare(2, 5, s3, 0, 5)",
s1.compare(2, 5, s3, 0, 5));
// comparing s2 and s4
displayResult("s4.compare(0, s2.size(), s2)",
s4.compare(0, s2.size(), s2));
// comparing s2 and s4
displayResult("s2.compare(0, 3, s4)", s2.compare(0, 3, s4));
}
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