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package jiuzhang.java.elementary;

public class StringToIntegerV2 {

public int stringToInteger(String str) {

//get the sign of the integer

int sign = 1;

int startIndex = 0;

if (str.charAt(0) == '-') {

sign = -1;

startIndex = 1;

}

int result = 0;

int interval = 0 - '0'; //note the interval should always be dest - start

int weight = 1; //note the mapping between weight and index

for (int i = str.length() - 1; i >= startIndex; i--) {

result += (str.charAt(i) + interval) * weight;

weight *= 10;

}

return sign * result;

}

}