We may come across various tricky programs in our day-to-day life. Maybe in technical interviews, coding tests, or C/C++ classrooms.
Here is a list of such programs:-
- Print text within double quotes (" ").
This may seem easy, but beginners may get puzzled while printing text within double quotes.
Time Complexity: O(1)
Auxiliary Space: O(1)
- To check if two numbers are equal without using arithmetic operators or comparison operators.
The simplest solution for this is using the Bitwise XOR operator (^). We know that for two equal numbers XOR operator returns 0. We will use the XOR operator to solve this problem.
Time Complexity: O(1)
Auxiliary Space: O(1)
- Print all natural numbers up to N without using a semi-colon.
We use the idea of recursively calling the main function.
Output1 2 3 4 5 6 7 8 9 10
Time Complexity: O(1)
Auxiliary Space: O(1)
- To Swap the values of two variables without using any extra variable.
Time Complexity: O(1)
Auxiliary Space: O(1)
- Program to find the Maximum and minimum of two numbers without using any loop or condition.
The simplest trick is-
Time Complexity: O(1)
Auxiliary Space: O(1)
- Print the maximum value of an unsigned int using One's Complement (~) Operator in C.
Here is a trick to find the maximum value of an unsigned int using one's complement operator:
OutputMax value : 4294967295
Time Complexity: O(1)
Auxiliary Space: O(1)
- To find the sum of two integers without using '+' operator.
This is a very easy mathematics trick.
We know that a + b = - (-a-b). So this will work as a trick for us.
Time Complexity: O(1)
Auxiliary Space: O(1)
- Program to verify the condition inside if block.
Time Complexity: O(1)
Auxiliary Space: O(1)
- Program to divide an integer by 4 without using '/' operator.
One of the most efficient ways to divide an integer by 4 is to use right shift operator (">>").
Time Complexity: O(1)
Auxiliary Space: O(1)
- Program to check endianness of the computer.
