Answer Happy

C programming, please explain by adding comments
Hey at the moment this is what I have with the code and I wouldlike to modify it to add the stuff im missing
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Code
#include <stdio.h>#include <string.h>#include <stdlib.h>typedef enum { NONE =0, UP =1, DOWN=2, LEFT =4, RIGHT =8}Direction;
typedef struct { int x,y;}Vertex;typedef struct { int numberOfVertices; Direction shiftDirection; Vertex* vertexList;}Polygon;int main(int argc, char** argv)//./main 12{ int max_num_of_polygons = 100;//sscanf(argv[1], "%d",&max_num_of_polygons); Polygon* list = (Polygon*) malloc(max_num_of_polygons* sizeof(Polygon)); char command[1000]; char tokentemp[20]; char firsttoken[20]; char rest[1000]; char *token [3]; int polygonindex = 0; Vertex tempVertexList[100]; //first polygon is at list[0] //second one is at list[1] //strcpy(command, "turn 3 right-up\n"); //strcpy(command, "shift 3 20\n"); strcpy(command, "add 3 4 1 2 3 4 5 6 7 8 91\n"); //strcpy(command, "summary\n"); //strcpy(command, "quit\n"); sscanf(command, "%s %[^\n]\n", firsttoken,rest); if(!strcmp(firsttoken, "quit")){ printf("rest is %s", rest); } if(!strcmp(firsttoken, "summary")){ printf("rest is %s", rest); } if(!strcmp(firsttoken, "shift")){ printf("rest is %s", rest); } if(!strcmp(firsttoken, "turn")){ printf("rest is %s", rest); } if(!strcmp(firsttoken, "add")){ printf("rest is %s\n", rest); int n = strlen(rest), x, y; rest[n] = '\n'; rest[n+1] = '0'; int rv = 0; int counter = 0; while((rv = sscanf(rest, "%d %d%[^\n]\n", &x, &y, rest)) >= 2){ printf("coordinate of thefirst point is (%d, %d), and the rest is %s, rv = %d\n", x, y,rest, rv); tempVertexList[counter].x= x; tempVertexList[counter++].y = y; if(rv == 2) break; } list[polygonindex].numberOfVertices =counter; list[polygonindex].shiftDirection =NONE; list[polygonindex].vertexList =(Vertex*) malloc(counter * sizeof(Vertex)); for(int i = 0; i <counter;i++) list[polygonindex].vertexList.x =tempVertexList.x, list[polygonindex].vertexList.y =tempVertexList.y; polygonindex++; }
return 0;}
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Handlers
Acceptable format of summary
polygon #1 has 4 vertices. It's cetroid is at (1.2,3.4).polygon #2 has 3 vertices. It's cetroid is at (1.2,3.4).polygon #3 has 6 vertices. It's cetroid is at (1.2,3.4).polygon #4 has 4 vertices. It's cetroid is at (1.2,3.4).polygon #5 has 4 vertices. It's cetroid is at (1.2,3.4).
Turn command handler
//command = "turn 4 right-up"//char * token[3];//token[0]: "turn"//token[1]: "4"//token[2]: "right-up"Direction givenDirection = 0;if(strstr(token[2], "right")) givenDirection |= RIGHT;if(strstr(token[2], "left")) givenDirection |= LEFTif(strstr(token[2], "up")) givenDirection |= UP;if(strstr(token[2], "down")) givenDirection |= DOWN;list[atoi(token[1])].shiftDirection = givenDirection;
Shift command handler:
//command: "shift 4 12"//token[0]: "shift"//token[1]: "4"//token[2]: "12"if(list[atoi(token[1])].shiftDirection & RIGHT) //go over all vertices and add their x coord. byatoi(token[2])if(list[atoi(token[1])].shiftDirection & LEFT) //go over all vertices and add their x coord. by-atoi(token[2])if(list[atoi(token[1])].shiftDirection & UP) //go over all vertices and add their y coord. byatoi(token[2])if(list[atoi(token[1])].shiftDirection & DOWN) //go over all vertices and add their y coord. by-atoi(token[2])
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In this assignment, you are asked to write a program that stores and manipulates a list of at-most n polygons where n is given as a command-line argument when running the program. Each polygon must be stored in a structure like this: typedef struct { int numberOfVertices; Direction shift Direction; Vertex* vertexList; }Polygon; where Direction and Vertex are defined like this: typedef enum { NONE = 0, UP = 1, DOWN = 2, LEFT = 4, RIGHT = 8 }Direction; typedef struct { int x, y; }Vertex; 1 Program Input Commands There are five valid input commands: • add X₁ Y₁ 22 Y2 --- In Yn: adds an n-gon with vertices located at coordinates (2₁,91), (2, 2),..., (n. Yn) to the list of all polygons. The newly added polygon must have its shift Direction set to NONE. • summary: prints the program's list of polygons. For each polygon, you need to print the number of vertices and the x-y coordinates of the polygon's centroid. To avoid the complications of calculating the centroid, you can assume that the x-coordinate (y-coordinate) of a polygon's centroid is equal to the average of x-coordinates (y- coordinates) of the polgyon's vertices.
• (15% bonus) turn k x: updates the shift Direction of polygon stored at index k of the program's list of polygons. The shift Direction has to be updated based on the value of that can be equal to one of the following strings: - left - right - up - down - right-up or up-right - left-up or up-left - right-down or down-right -left-down or down-left . (15% bonus) shift ks: updates the x-y coordinates of vertices of polygon stored at index k of the program's list of polygons. To update the vertices' coordinates of a polygon, you need to check its shift Direction. If the direction is NONE, then the shift command has no side effect. If the direction is RIGHT(LEFT), then s has to be added to(subtracted from) the x-coordinate of every vertex of the polygon. If the direction is UP (DOWN), thens has to be added to(subtracted from) the y-coordinate of every vertex of the polygon. If the direction is RIGHT and UP, then s has to be added to both the x- coordinate and y-coordinate of every vertex of the polygon, etc. •quit: ends the program