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227NewVersion.java
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227NewVersion.java
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//https://leetcode.com/problems/basic-calculator-ii/
public static int calculate(String s) {
s=s.trim();
int length=s.length();
int result=0;
int sign=1;
boolean toTime=false;
boolean toDivide=false;
Stack<Integer> box=new Stack<>();
for(int i=0;i<length;i++){
if(s.charAt(i)>=48 && s.charAt(i)<=57){
int num=s.charAt(i)%48;
i++;
while((i<length) && (s.charAt(i)>=48 && s.charAt(i)<=57)){
num*=10;
num+=s.charAt(i)%48;
i++;
}
i--;
num=num*sign;
sign=1;
box.add(num);
if(toTime==true){
num=box.pop()*box.pop();
toTime=false;
box.add(num);
}
if(toDivide==true){
int t=box.pop();
num=box.pop()/t;
toDivide=false;
box.add(num);
}
}
else if(s.charAt(i)=='+'){
sign=1;
}
else if(s.charAt(i)=='-'){
sign=-1;
}
else if(s.charAt(i)=='*'){
toTime=true;
}
else if(s.charAt(i)=='/'){
toDivide=true;
}
}
while(!box.isEmpty()){
result+=box.pop();
}
return result;
}