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#include <stdlib.h>
#include <stdio.h>
int main(void)
{
char str[10] = "A12F";
int value = strtol(str, (char**)NULL, 16);
value >>= 3;
sprintf(str, "%d", value);
printf("%s\n", str);
return 0;
}
enum Status {kValid = 0, kInvalid};
int g_nStatus = kValid;
int StrToInt(const char* str)
{
g_nStatus = kInvalid;
long long num = 0;
if(str != NULL)
{
const char* digit = str;
// the first char in the string maybe '+' or '-'
bool minus = false;
if(*digit == '+')
digit ++;
else if(*digit == '-')
{
digit ++;
minus = true;
}
// the remaining chars in the string
while(*digit != '/0')
{
if(*digit >= '0' && *digit <= '9')
{
num = num * 10 + (*digit - '0');
// overflow
if(num > std::numeric_limits<int>::max())
{
num = 0;
break;
}
digit ++;
}
// if the char is not a digit, invalid input
else
{
num = 0;
break;
}
}
if(*digit == '/0')
{
g_nStatus = kValid;
if(minus)
num = 0 - num;
}
}
return static_cast<int>(num);
}