Warning

## Cvičení 2

### 02a

while1.py:

print("for")
for i in range(10,40,5):
print(i)
print("while")
i=10
while i<40:
print(i)
i+=5
while2.py:
print("for")
for i in range(20,-20,-5):
print(i)
print("while")
i=20
while True:
print(i)
i-=5
if i<=-20:
break
while-continue.py
for i in range(15):
if i%2==0:
continue
if i%3==0:
continue
print(i)

print("while")
i=0
while i<15:
if i%2==0:
i+=1
continue
if i%3==0:
i+=1
continue
print(i)
i+=1
problem.py:
i=int(input())
while i>1:
print(i)
if i%2==0:
i//=2 # i = i//2
else:
i=i*3+1

### 02b

presnost.py:

suma=0
step=0.1
for i in range(1,11):
suma+=step
if suma==i/10:
print("Plati", suma, "rovno", i/10)
else:
print("Neplati", suma, "nerovno", i/10)
rovnost.py:
x=2.1
epsilon=1e-10
print(abs(x+0.2-2.3))
if abs(x+0.2-2.3)>epsilon:
y=10./(x-2.1)
print(y)
else:
print("Nelze delit nulou")
odmocnina.py:
y=2
x=0
step=1
k=0
for i in range(100):
limit=10
while (x+step)**2<=y and (i==0 or limit>=0):
x+=step
print("Krok",k,x,x**2,y)
k+=1
limit-=1
if i>0 and limit<0:
break
step/=10
print(x)
print("Vysledek", x, x**2, y)

### 02c

puleni.py:

c=float(input())
if c>=0:
x1=0
if c<=1:
x2=1
else:
x2=c
#zacneme pulit interval
k=0
while (x2-x1)>1e-10:
x_s = (x1+x2)/2
f_x_s = x_s**2-c
f_x1 = x1**2-c
if ((f_x1<0) == (f_x_s<0)):
x1 = x_s
else:
x2 = x_s
print("Krok",k,x1,x2, x_s**2, c)
k+=1
x_r = (x1+x2)/2
print(x_r, x_r**2, c)
else:
print("Odmocnina ze zaporneho cisle neni realna")

newton.py:

c=float(input())
if c>=0:
x_n=1
x_n_1 = x_n/2+c/(2*x_n)
while abs(x_n_1-x_n)>1e-10:
x_n = x_n_1
x_n_1 = x_n/2+c/(2*x_n)
print(x_n_1, x_n_1**2, c)
print(x_n_1, x_n_1**2, c)
else:
print("Odmocnina ze zaporneho cisle neni realna")