1 #include <iostream>
2
3 using namespace std;
4 int toInteger(char string[]);
5 int main(){
6 char string[100]={0};
7 cin>>string;
8 cout<<toInteger(string)<<endl;
9 return 0;
10 }
11
12 int toInteger(char string[])
13 {
14 //Your code is here
15 int ret = 0;
16 bool flag = true;
17 unsigned int idx = 0;
18
19 char c = string[idx];
20 if (c == '+') {
21 flag = true;
22 ++idx;
23 } else if (c == '-') {
24 flag = false;
25 ++idx;
26 }
27
28 for (; (c=*(string + idx)) != '\0' && c >= '0' && c <= '9'; ++idx) {
29 if (flag) {
30 int temp = ret * 10 + c - '0';
31 if (ret >= temp) {
32 return 2147483647;
33 }
34 else {ret = ret * 10 + c - '0';}
35 }
36 else {
37 int temp = ret * 10 + c - '0';
38 if (ret >= temp) {
39 return -2147483648;
40 }
41 else {ret = ret * 10 + c - '0';}
42 }
43
44 }
45 return flag ? ret : -ret;
46 }
