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General Computer Science - 01

- May 17, 2022

What is the Incognito window in Chrome? A google chrome window for browsing privately. It is not possible to see our activity by the people who use our device With private browsing, the following information is not preserved in the browser Browsing history Cookies and site data The data entered in forms But still, the following are visible Websites which we visit Details of ISP (Internet Service Provider) How to Open Incognito Window? Open Chrome Click the three vertical dots in the top right of the browser window Select the New Incognito Window Option (OR) Ctrl + Shift+n HAPPY BROWSING PRIVATELY

Python Tips -05

- May 14, 2022

What is the output of the following Python code snippet? def fun(a): a.append(100) print(a) a=[10,20,30] print("Before calling function fun, the value of a=",a) fun(a) print("After calling function fun, the value of a=",a) OUTPUT Before calling function fun, the value of a= [10, 20, 30] [10, 20, 30, 100] After calling function fun, the value of a= [10, 20, 30, 100] Explanation: Here the list a is passed as a parameter to the function namely fun . Since the list is a mutable type, by default it is passed as a reference. So any changes to the parameter a within the function fun will affect the original list a . So the value of the list after function call is [10,20,30,100].

Python Tips - 04

- May 12, 2022

Mutable vs Immutable Objects in PYTHON Every variable in python is an object and there are tw o types of objects in python. They are Immutable Objects Mutable Objects Immutable Objects Objects that can not be modified after creating int, float, decimal, bool, s tring and tuples are immutable objects in python Mutable Objects Objects that can be modified whenever needed Lists, Dictionaries and Sets are mutable objects in python Examples

C Puzzle 05

- May 09, 2022

Multiply a given number by 2 without using the Multiplication Operator It is possible with the help of the operator << << is a shift left operator << is a binary and bitwise operator The Shift Left operator moves every bit of the operand towards the left and the space created at the right side(LSB) will be filled with a zero. How the shift left operator works? LSB stands for Least Significant bit MSB stands for Most Significant bit Syntax: Operand = Operand << number of bits to shifted left Examples: x=x<<1 //1 bit of x to be shifted left y=y<<2 // 2 bits of y to be shifted left Note: Performing the shift left operation for the operand by one time is equal to multiplying the operand by two. Program

C Puzzle - 04

- May 07, 2022

Swap two numbers using a logical operator It is possible to swap two numbers without using a temporary variable and it is possible XOR operator. The truth table of the XOR operator Program #include <stdio.h> int main() { int a,b; printf("Enter two numbers\n"); scanf("%d%d",&a,&b); printf("Before Sawp: a=%d.... b=%d",a,b); a=a^b; b=a^b; a=a^b; printf("\nAfter Swap: a=%d.... b=%d",a,b); return 0; } OUTPUT

C Puzzle -03

- May 06, 2022

What is the return value of printf() and scanf() functions in C? scanf() : It returns the number of inputs scanned successfully from keyboard. Example: #include <stdio.h> int main() { int a,b,c,n; printf("Enter the values for a, b and c\n"); n=scanf("%d%d%d",&a,&b,&c); // The variable n receive the return value of scanf printf("%d",n); return 0; } Output Enter the values for a, b and c 10 20 30 3 printf() : It returns the number of bytes/characters printed on the screen. Example #include <stdio.h> int main() { int n,x; n=10; x=printf("%d",n); printf("\nx=%d bytes",x); return 0; } Output 10 x=2 bytes

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