# Input N in PHP and judge from 1 ~ Number of times 1 appears in the decimal number of N Sequence

Source: Internet
Author: User
`1 <? PHP 2 # input n to judge from 1 ~ Number of occurrences of 1 in the decimal number of N sequence 3 # For example, input 12, numbers containing 1 are, here 1 appears 5 times in total 4 5 # Number of times to judge the occurrence of 1 in decimal number 6 function count1dec (\$ X) {7 \$ I = 1; 8 \$ COUNT = 0; 9 10 # obtain each digit of X from the single digit, and determine if it is 111 while (\$ x> = POW (10, \$ I-1 )) {12 \$ r = floor (\$ X % POW (10, \$ I)/POW (10, \$ I-1); 13 if (\$ r = 1) {14 \$ count ++; 15} 16 \$ I ++; 17} 18 19 return \$ count; 20} 21 22 # determine the number of occurrences of the entire sequence 1 23 function count1dec_seq (\$ n) {24 \$ COUNT = 0; 25 for (\$ I = 1; \$ I <= \$ N; \$ I ++ ) {26 \$ count + = count1dec (\$ I); 27} 28 return \$ count; 29} 30 31 echo count1dec_seq (12); 32?>`
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