#include <iostream> using namespace std; int mystrcmp(const char* src, const char* dst); int mystrlen(const char*src); int main() { char s1[100] = { 0 }; char s2[100] = { 0 }; cin.getline(s1, sizeof(s1)); cin.getline(s2, sizeof(s2)); int ret = mystrcmp(s1, s2); co...