C Program To Check Whether Two Strings Are Anagram Of Each Other
Write a function to check whether two given strings are anagram of each other or not. An anagram of a string is another string that contains the same characters, only the order of characters can be different. For example, “abcd” and “dabc” are an anagram of each other.
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Method (Count characters):
This method assumes that the set of possible characters in both strings is small. In the following implementation, it is assumed that the characters are stored using 8 bit and there can be 256 possible characters.
- Create count arrays of size 256 for both strings. Initialize all values in count arrays as 0.
- Iterate through every character of both strings and increment the count of character in the corresponding count arrays.
- Compare count arrays. If both count arrays are same, then return true.
Below is the implementation of the above idea:
C
// C program to check if two strings// are anagrams of each other#include <stdio.h>#define NO_OF_CHARS 256 /* Function to check whether two strings are anagram of each other */bool areAnagram(char* str1, char* str2){ // Create 2 count arrays and initialize // all values as 0 int count1[NO_OF_CHARS] = {0}; int count2[NO_OF_CHARS] = {0}; int i; // For each character in input strings, // increment count in the corresponding // count array for (i = 0; str1[i] && str2[i]; i++) { count1[str1[i]]++; count2[str2[i]]++; } // If both strings are of different length. // Removing this condition will make the // program fail for strings like "aaca" // and "aca" if (str1[i] || str2[i]) return false; // Compare count arrays for (i = 0; i < NO_OF_CHARS; i++) if (count1[i] != count2[i]) return false; return true;} // Driver codeint main(){ char str1[] = "geeksforgeeks"; char str2[] = "forgeeksgeeks"; // Function Call if (areAnagram(str1, str2)) printf( "The two strings are anagram of each other"); else printf("The two strings are not anagram of each " "other"); return 0;} |
Output:
The two strings are anagram of each other
Please refer complete article on Check whether two strings are anagram of each other for more details!
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