#programming

Question

https://www.sanfoundry.com/c-program-checks-strings-anagrams/

what is the meaning of line number 32?

Comments

  int num1[26] = {0}, num2[26] = {0}, i = 0;

it means, num1 is array of 26 integers, the indexes indirectly specifies that, 

num1[0] = number of occurances of 'a'

num1[1] = number of occurances of 'b' ... etc

num1 is for string1, and num2 is for string2.

at the end he will compare num1[i]==num2[i] or not, if for every index it holds then those strings are anagrams !

 

coming to your doubt:-

num1[array1[i] - 'a']++;

array1[i] means the character in the string and subtracting 'a' means getting it's index value in the num1[].

 

How ?

let my string is "masthan" ,

array[0]='m' and array[1]='a' and array[2]='s' and array[3]='t' and array[4]='h' and array[5]='a' and array[6]='n'

let the i is the 3, then

num1[array1[3]-'a']++; ===> num1['t'-'a']++;

t=116 (as per ascii) and a = 97 ==> 't'-'a' = 116-97=19 which is the index of t

therefore num[19]++;

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Thank u brother!