##### WRITE A PROGRAM TO CHECK PRIME NUMBERS

```
>>> a = int (input("enter a number : "))
>>> c = 0
>>> if (a<1):
print("invalid input ! Try next number ")
>>> if(a==1):
print ("1 is not prime")
>>> else:
for i in range(2,a,1):
if (a%i==0):
c=1
if (c==0):
print(a," is prime")
else:
print(a," is not prime")
Output:
enter a number : 9
9 is not prime
```

##### WRITE A PROGRAM TO FIND FIBONACCI SERIES

```
# print fibonacci series
>>> a = 1
>>> b = 0
>>> n = int(input("how many fibonacci series ?? "))
>>> while (n>=1):
c = a+b
a = b
b = c
print (c, end=",")
n=n-1
Output:
how many fibonacci series ?? 5
1,1,2,3,5
```

```
# print nth fibonacci series value
>>> a = 1
>>> b = 0
>>> n = int(input("how many fibonacci series ?? "))
>>> while (n>=1):
c = a+b
a = b
b = c
n=n-1
>>> print (c,"is the required output")
Output:
how many fibonacci series ?? 6
8 is the required output
```

##### WRITE A PROGRAM TO CHECK ARMSTRONG NUMBER

```
>>> #153 is an Armstrong number.
>>> #1*1*1 + 5*5*5 + 3*3*3 = 153
>>> sum = 0
>>> c = 0
>>> num = int(input("enter a number : "))
>>> temp = num
>>> while(num>0): # to find length of number i.e. 153= 3
a = num%10
num= num//10
c=c+1
>>> num = temp
>>> while(num>0): # 1*1*1+5*5*5+3*3*3 = 153
a = num%10
num= (num-a)/10
sum = int(sum + a**c)
>>> if (sum == temp):
print("Armstrong Number")
>>> else:
print (" Not an armstrong number")
Output:
enter a number : 153
Armstrong Number
```

##### WRITE A PROGRAM TO FIND HCF OF TWO NUMBER

```
>>> num1 = int (input ("enter first number : "))
>>> num2 = int (input ("enter second number : "))
>>> if num1 < num2:
small = num1
>>> else:
small = num2
>>> for i in range(1, small+1):
if((num1 % i == 0) and (num2 % i == 0)):
hcf = i
>>> print(" HCF or GCD of ",num1,"&", num2,"is",hcf)
Output:
enter first number : 3
enter second number : 5
HCF or GCD of 3 & 5 is 1
```

##### WRITE A PROGRAM TO FIND LCM OF TWO NUMBER

```
>>> num1 = int (input ("enter first number : "))
>>> num2 = int (input ("enter second number : "))
>>> if num1 < num2:
small = num1
>>> else:
small = num2
>>> for i in range(1, small+1):
if((num1 % i == 0) and (num2 % i == 0)):
hcf = i
>>> lcm = int ((num1*num2)/hcf)
>>> print(" LCM of ",num1,"&", num2,"is",lcm)
Output:
enter first number : 4
enter second number : 8
LCM of 4 & 8 is 8
```

##### WRITE A PROGRAM TO FIND FACTOR OF A NUMBER

```
# 25= 5*5
>>> a = int(input("enter a number : "))
>>> for i in range(2,a):
for j in range (2,a+1):
if (a%j==0):
print (j,end=",")
break
a = int(a/j)
Output:
enter a number : 4
2,2
```

##### WRITE A NUMBER TO FIND FACTORIAL OF A NUMBER

```
>>> # 5! = 5*4*3*2*1
>>> a = int(input("enter a number : "))
>>> c = 1
>>> if (a==0):
print (" factorial of 0 is 1 ")
>>> else:
for i in range(1,a+1):
c=c*i
>>> print ("\n factorial of ",a,"is",c)
Output:
enter a number : 4
factorial of 4 is 24
```

##### WRITE A PROGRAM TO PRINT ALL VOWELS OF STRING

```
>>> a = str(input("enter a string ")).lower()
>>> b = len(a)
>>> c = 0
>>> while (c<=b-1):
if a[c]=='a' or a[c]=='e' or a[c]=='i' or a[c]=='o' or a[c]=='u' :
print(a[c])
c=c+1
Output:
enter a string Diwas
i
a
```

##### WRITE A PROGRAM TO CHECK PALINDROME STRING

```
>>> a = str(input("enter a string : "))
>>> b = (a[::-1])
>>> if (a==b):
print("Palindrome number")
>>> else:
print(" Not Palindrome number")
Output:
enter a string : sawid
Not Palindrome number
```

##### WRITE A PROGRAM TO SORT WORDS IN ALPHABETICAL ORDER

```
>>> a = "apple cow dog ant"
>>> a = a.split()
>>> a.sort()
>>> for word in a:
print(word)
Output:
ant
apple
cow
dog
```

##### WRITE A PROGRAM TO FIND SUM OF ITEMS OF LIST

```
>>> a = [1,2,3,4,5]
>>> sum = 0
>>> for i in a:
sum = sum + i
>>> print (" sum of items in list is : ",sum)
Output:
sum of items in list is : 15
```

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