1)# Python program to print odd Numbers in a List

list of numbers

list1 = [10, 21, 4, 45, 66, 93, 11]

only_odd = [num for num in list1 if num % 2 == 1]
odd_count = len(only_odd)

print("Even numbers in the list: ", len(list1) - odd_count)
print("Odd numbers in the list: ", odd_count

2) def prime(x, y):
prime_list = []
for i in range(x, y):
if i == 0 or i == 1:
continue
else:
for j in range(2, int(i/2)+1):
if i % j == 0:
break
else:
prime_list.append(i)
return prime_list
3)def isHappyNumber(num):

rem = sum = 0;

#Calculates the sum of squares of digits    
while(num > 0):    
    rem = num%10;    
    sum = sum + (rem*rem);    
    num = num//10;    
return sum;    

num = 82;

result = num;

while(result != 1 and result != 4):

result = isHappyNumber(result);

Happy number always ends with 1

if(result == 1):

print(str(num) + " is a happy number");

Unhappy number ends in a cycle of repeating numbers which contain 4

elif(result == 4):

print(str(num) + " is not a happy number");
4) print("Enter a Number: ")
num = int(input())

count = 0
while num!=0:
if count==0:
last = num%10
count = count+1
rem = num%10
num = int(num/10)

sum = rem + last
print("\nSum of first and last digit =", sum)
6) def Repeat(x):
_size = len(x)
repeated = []
for i in range(_size):
k = i + 1
for j in range(k, _size):
if x[i] == x[j] and x[i] not in repeated:
repeated.append(x[i])
return repeated
7) int firstNonRepeatingElem(int arr[], int len) {
for(int i = 0; i < len; i++) // iterates over every element of the array
for(int j = 0; j < len; j++) { // checks if that element is repeating in the array
if(arr[i] == arr[j] && i != j) // breaks the loop if a repeating element is found
break;

  if(j == len - 1)  // if we reach the last index of the array and
    return i;       // haven't found a repetition for the element at index i,
}                   // then we return the index i

return -1;  // if all the elements in the array are repeating then we return a -1 flag.

}