Question

How to compare two strings lexicographically in C++

Answer 1

#include <iostream>
#include <string>

int compareStr(const std::string a, const std::string b) {
    return a.compare(b);
}

int main() {
    std::cout << compareStr("aa", "ab") << std::endl;     // <
    std::cout << compareStr("aa", "ba") << std::endl;     // <
    std::cout << compareStr("a", "b") << std::endl;       // <
    std::cout << compareStr("a", "c") << std::endl;       // <
    std::cout << compareStr("aaab", "aacx") << std::endl; // <
    
    std::cout << compareStr("aa", "aa") << std::endl; // ==
    
    std::cout << compareStr("ba", "aa") << std::endl; // >
    std::cout << compareStr("ca", "aa") << std::endl; // >
    std::cout << compareStr("ab", "aa") << std::endl; // >
    std::cout << compareStr("b", "a") << std::endl;   // >
    std::cout << compareStr("b", "aac") << std::endl; // >
}


 
/*
run:
 
-257
-65536
-1
-2
-1
0
65536
131072
257
1
1
 
*/

 

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