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64 lines (51 loc) · 1.86 KB
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validNumuber.java
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64 lines (51 loc) · 1.86 KB
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public class Solution {
public boolean isNumber(String s) {
// Start typing your Java solution below
// DO NOT write main() function
String trimed = s.trim();
int i = 0;
boolean seenE = false;
boolean seenDot = false;
int len = trimed.length();
if(len == 0) return false;
while(i < len) {
char c = trimed.charAt(i);
if(c >= '0' && c <= '9') {
++i;
continue;
}
if(c == '.') {
if(seenDot) {
return false;
}
if(len == 1 || (i-1<0 || !isNum(trimed.charAt(i-1))) && (i+1>=len || !isNum(trimed.charAt(i+1)))) {
return false;
}
if(seenE) return false;
seenDot = true;
} else if(c == 'e' || c == 'E') {
if(seenE) {
return false;
}
if(i == 0 || i == len - 1) return false;
if((trimed.charAt(i-1)!='.' && !isNum(trimed.charAt(i-1))) ||
!isNum(trimed.charAt(i+1)) && trimed.charAt(i+1)!='+' && trimed.charAt(i+1)!='-') {
return false;
}
seenE = true;
} else if(c == '+' || c == '-'){
if(i == len - 1) return false;
if(i != 0 && (trimed.charAt(i-1)!= 'e'&&trimed.charAt(i-1)!='E')) {
return false;
}
} else {
return false;
}
++i;
}
return true;
}
private boolean isNum(char c) {
return c >= '0' && c <='9';
}
}