To Check Whether the Given Point P is inside a Triangle or Not..

#include<stdio.h>
    #include<ctype.h>
    #include<conio.h>
    #include<math.h>
    
    int main()
    {
    int x[]={0,0,0,0};
    int y[]={0,0,0,0};
    
    int i=0;
    
    int VarX=0, VarY=0;
    int Size=sizeof(x)/sizeof(int);
    clrscr();
    printf("Size of x: %d\n",Size);
    
    for (i=0;i<3;i++)
     {
      printf("Enter X[%d]:",i);
      scanf("%d",&x[i]);
      printf("Enter Y[%d]:",i);
      scanf("%d",&y[i]);
     }
    
    printf(" \n Enetr the Co-ordinates of the Fourth Point \n");
     printf("\n Enter X[3] :  ");
    scanf("%d" , &x[3]);
    printf(" \n Enter Y[3] : " );
    scanf("%d", &y[3]);
    
     for (i=0;i<4;i++)
    
         {
           printf("X[%d]  Y[%d]  = [%d] [%d]  \n",i,i,x[i],y[i]);
          }
    
    i=0;
    
      if ( ( (x[i]<=x[3] ) && ( x[i+1]>=x[3])) || ( (x[i+1]<=x[3])  && (x[i]>=x[3])) )
    
    	{  
                         VarX=1;}
                         
                         else    if( ( (x[i+1]<=x[3]) && (x[i+2]>=x[3])) || ((x[i+2]<=x[3]) && (x[i+1]>=x[3])) )
    	        {    VarX=1;  }
    	       else   if ( ((x[i+2]<=x[3] && x[0]>=x[3])) || ((x[0]<=x[3] && x[i+2]>=x[3])))
    
    		{  VarX=1; }
    
    								    
    					      
    
    
    
    
    
    
    printf(" \n The Value of VarX  is :%d  ",VarX);
    
    
    i=0;
    
    
     if ( ((y[i]<=y[3]) && (y[i+1]>=y[3])) || ((y[i+1]<=y[3])  && (y[i]>=y[3])) )
    
    	{    VarY=1;}
    
    	else  if( ((y[i+1]<=y[3]) && (y[i+2]>=y[3])) || ((y[i+2]<=y[3]) && (y[i+1]>=y[3])) )
    
    	           {      VarY=1;    }
    	                       else    if ( ((y[i+2]<=y[3]) && (y[0]>=y[3])) || ((y[0]<=y[3]) && (y[i+2]>=y[3])) )
    					  {
    							    VarY=1;
    						 }
    
    		       
    
    
    			     
    
    
    	   printf("\n The Value of VarY is  %d  " , VarY);
    
    	   if (VarX  &&  VarY )
    	       { printf(" The Point X[4] Y[4] is in side the Triangle .....\n");}
    	       else { printf( "\n The Point is not Inside Triangle ....\n");}
    
    
    getch();
    
    return(0);
    
    }