TASK0-

#include <stdio.h>
#include <stdlib.h>
#define ERROR_VALUE 0.274510

int main(){
double current_var1, var2, var3, current_var4;
double prev_var1=0.0;
double prev_var4=0.0;
int NodeCount = 0;
int errorflag = 0;
char infilename[100]="";
char outfilename[100]="";

FILE * filein;
FILE * fileout;

printf("\n enter name of the file to be read(.txt filename):");
        scanf("%s",infilename);
        filein = fopen(infilename, "r");

while(!feof(filein)){

fscanf(filein, "%lf %lf %lf %lf\n", &current_var1,&var2,&var3,&current_var4);

        // BLACK TO WHITE TRANSITION
if ((prev_var1<0.6 && current_var1>0.6) || (prev_var4<0.6 && current_var4>0.6)) {
    errorflag = 1;
    }

if (errorflag) { //IF ERROR FLAG IS 1

            //If PLUS node is detected
            if ((current_var1>0.6) && (current_var4>0.6)) {
                NodeCount++;
                errorflag = 0;
            }
            // WHITE TO BLACK TRANSITION
            if ((prev_var1>0.6 && current_var1<0.6) || (prev_var4>0.6 && current_var4<0.6)) {
                NodeCount++;
                errorflag = 0;
            }
        }

prev_var1=current_var1;
prev_var4=current_var4;

}
printf("Total No Of Nodes: %d",NodeCount);
return 0;
}