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Interview Question

Software Engineer Interview(Student Candidate) Pittsburgh, PA

transfer the string hexadecimal number "f3a6.123f" into

  decimal number.

Interview Answer

1 Answer


1. Need a hex to decimal lookup table (e.g. java hashmap).
2. Convert string to char[].
3. Find the location of decimal point 'K'.
double result;
char[] data; // input
for(i = K-1; i >= 0,; i--){
  result += lookup.get(data[i])*Math.pow(16,K-1-i);
for(i=K+1; i<data.length; i++){
  result += lookup.get(data[i])*Math.pow(16,-(i-K));
return result;

I haven't tested this, so test if before you use it.

Anonymous on Nov 12, 2012

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