#include <string.h> //字符串形式的数字转int int StrToInt(char* s) { int num = 0, flag = 0; if (s[0] == '-') { s++; flag = 1; } for (int i = 0;s[i] != '\0';i++) num = s[i] - '0' + num * 10; return flag ? -num : num; } int evalRPN(char** tokens, int tokensLen...