C Program to perform 4-letter WORD UNSCRAMBLING

/*
        List all possible combinations of 4-letters in a word.
        Ex: The word 'TEST' can be unscrambled as TEST,TETS,TSET,TSTE,TTSE,TTES,etc.  
                                                                                                                                             */

/* 4-letter word unscrambling */

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

int i,j,k,l,sum=6;

char *str;

clrscr();

printf("Enter a 4-letter word or string : ");

scanf("%s",str);

if (strlen(str) == 4)

{

printf("The possible combinations of the given 4-letter word is shown.");

for (i = 0; i < 4; i++)

for (j = 0; j < 4; j++)

   if (i != j)

{

   for (k = 0; k < 4; k++)

if ((k != i) && (k != j))

{

   l = sum - (i + j + k);

   printf("\n%c%c%c%c",str[i],str[j],str[k],str[l]);

}

}

printf("\nTotal combinations = %d",4*3*2*1);

}

else

printf("\nInvalid string. Length of the string must be 4-letters only ");

getch();

}