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Create solution2.java #210

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29 changes: 29 additions & 0 deletions Java/String to integer/solution2.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
class Solution {
public int myAtoi(String s) {
s = s.trim();
if (s.isEmpty()) {
return 0;
}

int ans = 0, i = 0;
boolean neg = s.charAt(0) == '-';
boolean pos = s.charAt(0) == '+';

if (neg || pos) {
i++;
}

while (i < s.length() && Character.isDigit(s.charAt(i))) {
int digit = s.charAt(i) - '0';

if (ans > Integer.MAX_VALUE / 10 || (ans == Integer.MAX_VALUE / 10 && digit > Integer.MAX_VALUE % 10)) {
return neg ? Integer.MIN_VALUE : Integer.MAX_VALUE;
}

ans = ans * 10 + digit;
i++;
}

return neg ? -ans : ans;
}
}