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Program to Implement Levenshtein Distance Computing Algorithm



Program to Implement Levenshtein Distance Computing Algorithm

This is a C++ Program to find Levenshtein Distance. The Wagner-Fischer algorithm is a dynamic programming algorithm that measures the Levenshtein distance between two strings of characters.

For example, the Levenshtein distance between "kitten" and "sitting" is 3, since the following three edits change one into the other, and there is no way to do it with fewer than three edits:

    #include <stdio.h>

    #include <math.h>

    #include <string.h>

    int d[100][100];

    #define MIN(x,y) ((x) < (y) ? (x) : (y))

    int main()

    {

        int i,j,m,n,temp,tracker;

        char s[] = "Happy Codings";

        char t[] = "C++ Programming Language Code Examples";

        m = strlen(s);

        n = strlen(t);

        for(i=0;i<=m;i++)

        d[0][i] = i;

        for(j=0;j<=n;j++)

        d[j][0] = j;

        for (j=1;j<=m;j++)

        {

            for(i=1;i<=n;i++)

            {

                if(s[i-1] == t[j-1])

                {

                    tracker = 0;

                }

                else

                {

                    tracker = 1;

                }

                temp = MIN((d[i-1][j]+1),(d[i][j-1]+1));

                d[i][j] = MIN(temp,(d[i-1][j-1]+tracker));

            }

        }

        printf("the Levinstein distance is %d\n",d[n][m]);

        return 0;

    }