Here is the solver code for any 9x9 sudoku

Here is the C Code to solve the soduku Puzzle.

#include<stdio.h>
                                             int sod[10][10],given[10][10],chances[10];
                                             main()
                                             {
                                             int i,j,c,previous=0,fcolumn=-1,frow=-1;
                                             FILE *fp;
                                             fp = fopen("data.txt","r");
                                             
                                             for(i=0;i<9;i++)
                                             for(j=0;j<9;j++)
                                             {
                                             fscanf(fp,"%d",&sod[i][j]);
                                             if(sod[i][j]!=0)
                                             given[i][j]=1;
                                             	 else {
                                             		 if ( fcolumn == -1 ){
                                             fcolumn = j;
                                             		    frow = i;
                                             		 }
                                             		 given[i][j]=0;
                                             	 }
                                             }
                                             fclose(fp);
                                             fp = fopen("output_soduku.txt","w");
                                             for(i=0;i<9;i++)
                                             for(j=0;j<9;j++)
                                             {
                                             if(given[i][j]==0)
                                             {
                                             do
                                             {
                                             cellchances(i,j);
                                             for(c=1;c<10;c++)
                                             if(chances[c]!=0 && chances[c] > previous)
                                             {
                                             sod[i][j]=chances[c];
                                             previous=0;
                                             break;
                                             }
                                             if(i == frow && j == fcolumn && c == 10 )
                                             {
                                             			   fprintf(fp,"GIVEN SODUKU WRONGLY ENTERED");
                                             return;
                                             }
                                             if(c==10)
                                             {
                                             sod[i][j]=0;
                                             do
                                             {
                                             if(j==0 && i!=frow )
                                             		         {
                                             					i--;
                                             					j=8;
                                             			     }
                                             				 else if(j!=0 ) 
                                             					j--;
                                             			   	 if(given[i][j]==0)
                                             				 {
                                             				  previous=sod[i][j];
                                             				  sod[i][j]=0;
                                             				 }
                                             	       }while(given[i][j]!=0);
                                                   }
                                                      }while(c==10);
                                                }
                                              }
                                              
                                              fprintf(fp,"THE OUPUT OF  GIVEN SODUKU :\n");
                                              for(i=0;i<9;i++)
                                              {
                                                for(j=0;j<9;j++)
                                                 fprintf(fp,"%d ",sod[i][j]);
                                                fprintf(fp,"\n");
                                              }
                                             }
                                             
                                             cellchances(int x,int y)
                                             {
                                               int p,h,v,ch;
                                               for(p=1;p<10;p++) 
                                               {
                                                 chances[p]=p;
                                                 for(ch=0;ch<9;ch++) 
                                                 {
                                                  if(sod[x][ch] == p) 
                                                     chances[p]=0; 
                                                  if(sod[ch][y] == p) 
                                                     chances[p]=0; 
                                                 }
                                                 for(h=x-(x%3);h<x-(x%3)+3;h++) 
                                                   for(v=y-(y%3);v<y-(y%3)+3;v++) 
                                                     if(sod[h][v]==p) 
                                                       chances[p]=0; 
                                              }
                                             }