To round up a number in JavaScript, you can use the Math.ceil() function. This function takes a number as an argument and returns the smallest integer greater than or equal to that number.

Here's an example:

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let myNumber = 7.8;
let roundedNumber = Math.ceil(myNumber);

console.log(roundedNumber); // Output: 8

In this example, the Math.ceil() function is used to round up the number 7.8 to the nearest whole number, which is 8.

The Math.floor() function in JavaScript returns the largest integer less than or equal to a given number. It essentially rounds down a number to the nearest whole number.

Here's an example:

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let num = 4.7;
let roundedNum = Math.floor(num);
console.log(roundedNum); // Output: 4

In the example above, Math.floor(num) rounds down the number 4.7 to 4.

You cannot subtract a string from an integer in Python. If you try to do so, you will get a TypeError. However, you can convert the integer to a string or the string to an integer and then perform the subtraction.

If you want to subtract an integer from a string, you can convert the integer to a string and then use string concatenation to remove the integer from the string.

Here's an example in Python:

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str_num = "10"
num = 3
result = int(str_num) - num
print(result) # Output: 7

str_text = "SheCodes has 1000 students"
num = 1000
result = str_text.replace(str(num), "")
print(result) # Output: SheCodes has students

parseInt() is a function in JavaScript that parses a string argument and returns an integer of a specified radix (the base in mathematical numeral systems). The function takes in two arguments: the first is the string to be converted to an integer, and the second (optional) is the radix. If the radix argument is omitted, the function assumes base 10.

For example, the following code converts the string "42" to an integer:

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const stringNum = "42";
const intNum = parseInt(stringNum);

console.log(intNum); // output: 42

Here, since the radix argument is omitted, parseInt() assumes base 10. If the string had been "1010" (binary), we could specify the radix like so:

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const binaryString = "1010";
const intNum = parseInt(binaryString, 2);

console.log(intNum); // output: 10 

In this example, we set the radix to 2 (binary), so parseInt() returns the integer corresponding to the binary string "1010", which is 10 in decimal.

You can learn more about parseInt() in the MDN Web Docs.

Math.round() is a built-in JavaScript function that rounds the given number according to the nearest integer value.

Here are some examples:

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Math.round(4.2); // returns 4
Math.round(6.9); // returns 7
Math.round(3.6); // returns 4

In the first example, 4.2 is closest to 4, so Math.round(4.2) returns 4 as output. Similarly, in the second example, 6.9 is closer to 7, so Math.round(6.9) returns 7. Finally, in the third example, 3.6 is closer to 4, so Math.round(3.6) returns 4.

It's important to remember that Math.round() returns an integer, not a decimal value.

To take only numbers from a string and turn them into an integer in Python, you can use regular expressions and the int() function. Here's an example:

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import re

my_string = "I am 27 years old"

numbers = re.findall('\d+', my_string)  # finds all the numbers in the string
result = list(map(int, numbers))  # converts the numbers to integers and puts them in a list

print(result)  # prints [27]

In the code above, we import the re module to use regular expressions. Then, we define a string with some text and numbers. We use the re.findall() function to find all the numbers in that string and store them in the numbers variable. Finally, we use a list comprehension and the int() function to convert each number in the list to an integer.

To concatenate a string with an integer in the middle in C++, you can use std::to_string() function. This function will convert an integer to a string, which you can then concatenate with another string using the + operator. Here's an example code:

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#include <iostream>
#include <string>

int main() {
    int num = 42;
    std::string str = "The answer to life, the universe and everything is " + std::to_string(num) + ".";
    std::cout << str << std::endl;

    return 0;
}

Output:

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The answer to life, the universe and everything is 42.

In this code, we declared an integer variable num and initialized it to 42. Then we concatenated the string "The answer to life, the universe and everything is " with the integer num that has been converted to a string using std::to_string(). Finally, we concatenated the resulting string with "." using the + operator and stored it in the str variable.

In JavaScript, an integer is a whole number with no fractional part. It can be a positive number, a negative number or zero. Integers are stored as 32-bit or 64-bit values, depending on the platform.

Here's an example of declaring an integer variable in JavaScript:

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let myInteger = 42;

In this example, the variable myInteger is assigned the value of 42, which is an integer.

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import random
print(random.randint(1, 100))

This code imports random module and uses the randint() function from that module to generate a random integer between the numbers 1 and 100, inclusive. The generated integer is then printed using the print() function.

No, a string cannot be equal to an integer because they are different data types. A string is a collection of characters (e.g. "Hello World") while an integer is a numerical value (e.g. 5).

In Python, you can convert an integer to a string using the str() function. For example, if you have a = 5 and you want to convert it to a string, you simply use a = str(5).

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a = 5
a = str(5)
print(a)

This would output '5'. You can also do this by casting the integer as a string like a = '5'.

In JavaScript, the Math.round() method can be used to round a number to the nearest integer. For example:

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let num = 1.24;
let roundedNum = Math.round(num);

console.log(roundedNum); // 1

More information on the Math.round() method can be found here.