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# Untitled

a guest Jan 23rd, 2019 52 Never
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1. Example octal number = 147
2.
3. Method one: From left to right.
4. Step 1: First digit is one. Take that times 8 plus 4. Got 12.
5. Step 2: Take 12 times 8 + 7. Got 103, and 103 is the answer.
6.
7. Method 2, bitshift:
8. Octal Number: 147.
9.
10. Step 1: 1 = 1(bin) = Shift << 3 = 1000(result value)
11. Step 2: 4 = 100(bin) + 1000(result value) = 1100(result value)
12. Step 3: 1100(result value) Shift << 3 = 1100000
13. Step 4: 7 = 111(bin) + 1100000(result value) = 1100111
14. Step 5: 1100111 binary is 103 decimal.
15.
16. for ( int i = 0; i < length; i++ ){
17.      c = (str.charAt(i) ^ 48);
18.      if ( c > 7 ) return 0;
19.      out = (out << 3) + c;
20.  }
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