#include 
    
     #include 
     
      enum Status { kValid = 0, kInvalid };int g_nStatus = kValid;long long Str2IntCore(const char* digit, bool minus);int Str2Int(const char* str) {	g_nStatus = kInvalid;	long long num = 0;	if(str != NULL && *str != '\0') {		bool minus = false;		if(*str == '+')			str++;		else if(*str == '-') {			minus = true;			str++;		}		if(*str != '\0')			num = Str2IntCore(str, minus);	}	return (int)num;}long long Str2IntCore(const char* digit, bool minus) {	long long num = 0;	while(*digit != '\0') {		if(*digit >= '0' && *digit <= '9') {			int flag = minus ? -1 : 1;			num = num*10 + flag*(*digit - '0');			if((!minus && num > 0x7FFFFFFF) || (minus && num < (signed int)0x80000000)) {				num = 0;				break;			}			digit++;		}		else {			num = 0;			break;		}	}	if(*digit == '\0')		g_nStatus = kValid;	return num;}void Test(const char* testName, const char* str, int expected) {	if(testName != NULL)		printf("%s begins: ", testName);	if(expected == Str2Int(str))		printf("passed.\n");	else		printf("failed.\n");	printf("g_nStatus: %d\n", g_nStatus);}//positivevoid Test1() {	char* str = "7865";	Test("Test1", str, 7865);}//negativevoid Test2() {	char* str = "-7865";	Test("Test2", str, -7865);}//NULLvoid Test3() {	Test("Test3", NULL, 0);}//""void Test4() {	char* str = "";	Test("Test4", str, 0);}//Invalidvoid Test5() {	char* str = "+8j7";	Test("Test5", str, 0);}//beyondvoid Test6() {	char* str = "5463728392";	Test("Test6", str, 0);}int main(int argc, char* argv[]) {	Test1();	Test2();	Test3();	Test4();	Test5();	Test6();	return 0;}