# Notes

## Notes - notes.io

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

typedef struct{
int x;
int y;
}point2D;

int choice;
int a, b, s, d, z;

void distance(){
point2D p1, p2;
point2D *p3, *p4;
p3 = (point2D*)malloc(sizeof(point2D));
p4 = (point2D*)malloc(sizeof(point2D));
p3 = &p1;
p4 = &p2;

printf("input p1.x: ");
scanf("%d",&p4->x);
printf("input p1.y: ");
scanf("%d",&p4->y);
printf("input p2.x: ");
scanf("%d",&p3->x);
printf("input p2.y: ");
scanf("%d",&p3->y);

if(p4->x > p3->x)
a = p4->x - p3->x;
else
a = p3->x - p4->x;

if(p4->y > p3->y)
b = p4->y - p3->y;
else
b = p3->y - p4->y;

d = sqrt((a*a)+(b*b));

printf("Distance = %d",d);

printf("nIf you want to return tap 4n");
scanf("%d", &z);
if(z == 4){
system("cls");
return main();
}else {
printf("Wrong button");
system("cls");
}
}
void area(){
point2D p1, p2;
point2D *p3, *p4;
p3 = (point2D*)malloc(sizeof(point2D));
p4 = (point2D*)malloc(sizeof(point2D));
p3 = &p1;
p4 = &p2;

printf("input p1.x: ");
scanf("%d",&p4->x);
printf("input p1.y: ");
scanf("%d",&p4->y);
printf("input p2.x: ");
scanf("%d",&p3->x);
printf("input p2.y: ");
scanf("%d",&p3->y);

if(p4->x > p3->x)
a = p4->x - p3->x;
else
a = p3->x - p4->x;

if(p4->y > p3->y)
b = p4->y - p3->y;
else
b = p3->y - p4->y;

s = a * b;

printf("Area = %d",s);
printf("nIf you want to return tap 4n");
scanf("%d", &z);
if(z == 4){
system("cls");
return main();
}else {
printf("Wrong button");
}
}

int main(){
do{
printf("nMenun");
printf("1. Distance");
printf("2. Area");
printf("3. Exitn");
scanf("%d", &choice);
if(choice == 1){
system("cls");
distance();
}else if(choice == 2){
system("cls");
area();
}else choice = 3;
}while(choice != 3);
}

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