TASK1

#include <stdio.h>
#include <stdlib.h>

int main() {
    double current_var1, var2, var3, current_var4, current_var5;
    double prev_var1 = 0.0;
    double prev_var4 = 0.0;
    double prev_var5 = 0.0;

    char infilename[100] = "";
    char outfilename[100] = "";
    int NodeCount = 0, PLUS = 0, ONLY_RIGHT = 0, ONLY_LEFT = 0, Left_Straight = 0, Right_Straight = 0,reversetrans = 0,errorflag2 = 0,errorflag1 = 0;
    FILE* filein;
    FILE* fileout;

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

    int direction = 1; // 1: North, 2: East, 3: South, 4: West

    while (!feof(filein)) {
        int directionflag = 0;
        fscanf(filein, "%lf %lf %lf %lf %lf\n", &current_var1, &var2, &var3, &current_var4, &current_var5);

        /*WHEN LINE TO NON-LINE TRANSITION HAPPEN FOR SENSOR 5, THEN THERE ARE 2 POSSIBLE NODES ONLY RIGHT OR
        ONLY LEFT, (OR DEAD END ALSO) SO TO CHECK THAT NODES INDIVIDUALLY WE SET ERRORFLAG1 TO 1..*/
        if (prev_var5 > 0.6 && current_var5 < 0.6) {
            errorflag1 = 1;//ERRORFLAG SET TO 1 TO REMOVE ERROR..
        } else if ((prev_var1 < 0.6 && current_var1 > 0.6 && current_var5 > 0.6) ||
                   (prev_var4 < 0.6 && current_var4 > 0.6 && current_var5 > 0.6)) {
        /*WHEN NON-LINE TO LINE TRANSITION HAPPEN FOR SENSOR 1&4 THEN THERE ARE 3 POSSIBLE NODES: STRAIHGHT+RIGHT, STRAIHGHT+LEFT,
        PLUS, (OR END ALSO) SO TO CHECK THAT NODES INDIVIDUALLY WE SET ERRORFLAG2 TO 1..*/
            errorflag2 = 1;
        }

        if (errorflag1) {
            if (current_var1 < 0.6 && current_var4 > 0.6 && current_var5 < 0.6) {
                ONLY_RIGHT = 1;
                errorflag1 = 0;
            } else if (current_var1 > 0.6 && current_var4 < 0.6 && current_var5 < 0.6) {
                ONLY_LEFT = 1;
                errorflag1 = 0;
            }
        } else if (errorflag2) {
            /*TO REMOVE ERROR I IMPLEMENTED ONE LOGIC:WHEN NON-LINE TO LINE TRANSITION HAPPEN FOR SENSOR 1&4. AFTER THAT
            IF CURRENT VALUE OF SENSOR 1&4 IS GREATER THAN 0.6 THEN DIRECTLY PLUS NODE WILL COUNT. ELSE IF LINE TO NON-LINE
            TRANSITION IS HAPPEN THEN IF PREVIOUS VALUE OF 1 IS GREATER THAN 0.6 THEN STRAIGHT+LEFT NODE WILL COUNT.
            OTHERWISE STRAIGHT+RIGHT NODE WILL COUNT.*/
            if (current_var1 > 0.6 && current_var4 > 0.6) {
                PLUS = 1;
                errorflag2 = 0;
            } else if ((prev_var1 > 0.6 && current_var1 < 0.6) || (prev_var4 > 0.6 && current_var4 < 0.6)) {
                if (prev_var1 > 0.6 && prev_var4 < 0.6) {
                    Left_Straight = 1;
                    errorflag2 = 0;
                } else {
                    Right_Straight = 1;
                    errorflag2 = 0;
                }
            }
        }

        if (PLUS) {
            printf("LEFT TURN");
            printf("\tPLUS             ");
            direction = (direction - 1) % 4; // Rotate direction 90 degrees counterclockwise
                if (direction == 0) direction = 4;
                directionflag = 1;
            PLUS = 0;
        }
        else if (ONLY_RIGHT) {
            printf("RIGHT TURN");
            printf("\tONLY RIGHT       ");
            direction = (direction + 1) % 4; // Rotate direction 90 degrees clockwise
                if (direction == 0) direction = 4;
                directionflag = 1;
            ONLY_RIGHT = 0;
        }
        else if (ONLY_LEFT) {
            printf("LEFT TURN");
            printf("\tONLY LEFT       ");
            direction = (direction - 1) % 4; // Rotate direction 90 degrees counterclockwise
                if (direction == 0) direction = 4;
                directionflag = 1;
            ONLY_LEFT = 0;
        }



        else if (Left_Straight){
             printf("LEFT TURN");
             printf("\tLeft + Straight      ");
             direction = (direction - 1) % 4; // Rotate direction 90 degrees counterclockwise
                if (direction == 0) direction = 4;
                directionflag = 1;
             Left_Straight=0;
        }

        else if (Right_Straight){
             printf("STRAIGHT");
             printf("\tRight + Straight");
             directionflag=1;
             Right_Straight=0;
        }

        if (directionflag) {
            switch (direction) {
                case 1:
                    printf("\t North\n");
                    break;
                case 2:
                    printf("\t East\n");
                    break;
                case 3:
                    printf("\t South\n");
                    break;
                case 4:
                    printf("\t West\n");
                    break;
            }
        }


        prev_var1=current_var1;
        prev_var4=current_var4;
        prev_var5=current_var5;
}

return 0;

}