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SubhanUllah

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Everything posted by SubhanUllah

  1. SubhanUllah
    #include <stdio.h> int nodiai(int n){ int x = 0; while(n){ x++; n /= 10; } return x; } int main(){ printf("%d, %d\n", 1234, nodiai(1234)); printf("%d, %d\n", 1234567, nodiai(1234567)); }
  2. SubhanUllah
    Using media queries: @media only screen and (min-width: 320px) and (max-width: 768px) { .nav { width:100%; } .nav-item { width:100%; float:none; } }
  3. SubhanUllah
    I have never used nested interfaces. The only case I can see where this is sensible is the multi-layered Sealed Interface pattern, e.g. interface Event { // definitions interface Foo extends Event { // Foo-specific event definitions } interface Bar extends Event { // Bar-specific event definitions } }
  4. SubhanUllah
    The const int (or int const) cannot be modified after definition. The int can. Example: const int a = 2; int b; b = a; b++;
  5. SubhanUllah
    int a; int *b = &a; Here the b is a pointer. It has been assigned value &a, which means the-address-of-a.
  6. SubhanUllah
    #include <stdio.h> #include <string.h> int main(){ char s[] = {"This is a string"}; printf("strlen says: %d\n", strlen(s)); int i = 0; do{ i++; }while(s[i]); printf("my calculation: %d\n", i); }
  7. SubhanUllah
    After fixing a tiny error there is no difference #include <stdio.h> int main(){ int p = 3, q = 4; printf("%d\n", (!(p<q))); printf("%d\n", (p>=q)); p = 4, q = 3; printf("%d\n", (!(p<q))); printf("%d\n", (p>=q)); }
  8. SubhanUllah
    Curly braces are used for initialization of objects. If the object supports it the members (storage) of the object will be directly assigned to the values in the braces. std::string s{"a string"}; int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 20 }; struct X { int x; int y; int z; }; X x{ 1, 3, 5}; X y = { 4, 5, 6}; This is called Unified Initialization, so that there is a consistent syntax, based around curly braces: int i{}; // initialized built-in type, equals to int i{0}; int j{10}; // initialized built-in type int a[]{1, 2, 3, 4} // Aggregate initialization X x1{}; // default constructor X x2{1}; // Parameterized constructor; X x4{x3}; // copy-constructor int* arr = new int[5]{ 1, 2, 3, 4, 5 }; //dynamic allocation with initialization
  9. SubhanUllah
    Here is how to reverse a string without a function: #include <iostream> #include <cstring> using namespace std; int main() { int i, n = 123456789, j, k, l, strlen; char str[10*(sizeof(char))]; char newstr[sizeof(str)]; bool is_positive = true; k=sizeof(str)/sizeof(str[0]); if (k < 0 ) { is_positive = false; } if (k < 0 ) is_positive = false; sprintf(str,"%d",n); //converts to decimal base. cout << " k is " << k << " str is " << str << endl; if (!is_positive) exit(1); j = 0; l = k-2; i = 0; while(i++ <= k){ /*cout << "newstr[" << j << "] is " << newstr[j] << " str[" << l << "] is " << str[l] << endl; */ newstr[j++] = str[l--]; } cout << "newstr is " << newstr << endl; return 0; } Outputs k is 10 str is 123456789 newstr is 987654321 Without using reverse of swap functions.
  10. SubhanUllah
    <h1></h1> is the largest heading tag in HTML. But,it can be customized by CSS to make it more large. Example : <!DOCTYPE html> <html> <head> <style> h1{ font-size: 62px; } </style> </head> <body> <h1>The table element</h1> </body> </html>
  11. SubhanUllah
    Add options to a select box in JavaScript: 1) Using the Option constructor and add() method: First, use the Option constructor to create a new option with the specified option text and value: let newOption = new Option('Option Text','Option Value'); Then, call the add() method of the HTMLSelectElement element: const select = document.querySelector('select'); select.add(newOption,undefined); 2) Using the DOM methods First, construct a new option using DOM methods: // create option using DOM const newOption = document.createElement('option'); const optionText = document.createTextNode('Option Text'); // set option text newOption.appendChild(optionText); // and option value newOption.setAttribute('value','Option Value'); Second, add the new option to the select element using the appendChild() method: const select = document.querySelector('select'); select.appendChild(newOption);
  12. SubhanUllah
    Sure, like this: #include <stdio.h> int main() { char *a = "Gdkkn\37vnqkc"; for (int i = 0; i < strlen(a); i++) printf("%c", *(a + i) + 1); } The a is an array. Its elements are accessed without indexes.
  13. SubhanUllah
    It's an array of strings. Example: #include <string> #include <iostream> #include <array> int main() { std::array<std::string, 2> a = {"Hello ", "world!"}; std::cout << a[0] << a[1]; } Here the a is an array of strings.
  14. SubhanUllah
    Two equal signs is a comparison. So: $a=1; Sets $a to 1. Now we can use it to test. If ($a==1) echo ‘A equals 1’; If (!$a!==1) echo ‘A does not equal 1’; You do have other ways of using this: >= check for greater than or equal to !>= not greater than or equal to. And the same for lesser than.
  15. SubhanUllah
    Assuming each URL is a .php file then set the PHP file yo: <?php header (‘Location: /path/to/newUrl.php'); Exit(); If you have one PHP script with different get data: <?php # this is index.php. you call it with # index.php?page=1 # to # index.php?page=4 # you should do this with case, but this works. If ($_GET[‘page']==1) { header (‘Location: /path/page1.php'); exit (); } If ($_GET[‘page']==2) { header (‘Location: /path/page2.htm'); exit (); } If ($_GET[‘page']==3) { header (‘Location: /path/page3.html'); exit (); } If ($_GET[‘page']==4) { header (‘Location: https://new.domain. com'); exit (); }
  16. SubhanUllah
    XML doesn’t tolerate syntax errors. HTML does, with specifications on to correct them. XML tags have to be closed. They can auto-close, like <stuff/> which is equivalent to <stuff></stuff>. HTML tags that are meant to be empty, don’t need a syntax that closes them. XML tags’ attribute values have to be quote. It’s <a thing="stuff"> or <a thing='stuff'> but not <a thing=stuff> XML tags don’t tolerate < other than to open a tag. If you want the text < in XML you need &lt; . In HTML you can use < if it doesn’t look like a correct tag opening. That’s just the obvious. There are many others.
  17. SubhanUllah
    Randint() and shuffle are your friends here. import random test_list = [random.randint(-100000, 100000) for i in range(300)] print(f"300 Random Ints \n{test_list}") # shuffle() mixes the list in place second_list = list(range(40)) random.shuffle(second_list) print(f"First 40 Ints shuffled \n{second_list}") # sample returns a new list and leaves the old one alone string_list = "Tell me and I forget, teach me and I may remember, involve me and I learn. Benjamin Franklin".split() shuffled_words = random.sample(string_list,len(string_list)) print(f"Original words \n{string_list}") print(f"And sample() to shuffle\n{shuffled_words}") The random.randint() and range() creates a list of 300 numbers selected randomly, from -100,000 to 100,000. Just change the parameters to get what you want. The second shuffles any list not just Integers. Sample() also shuffles and existing list, but creates a new list.
  18. SubhanUllah
    While defining the function or class, in the parentheses (), write the parameter followed by a =, followed by the default value… class Circle(): pi = 3.14 def __init__(self, radius=2): self.radius = radius def area(self): return self.pi * (self.radius)**2 c = Circle() print(c.area()) #OUTPUT 12.56
  19. SubhanUllah
    I would use a function But you can just put the code anywhere def get_pos_int(prompt='Please enter a positive Integer:'): while True: inp = input(prompt) try: num = int(inp) except ValueError: print(f"{inp} was not an Integer") continue else: if num < 0: print(f"{num} is not a positive Integer") continue else: break return num a = 1 + get_pos_int("Please enter a number to add to one:") print(f"result was {a}") b = get_pos_int() print (f"got {b} back") Output python get_positive.py Please enter a number to add to one:-12 -12 is not a positive Integer Please enter a number to add to one:A A was not an integer Please enter a number to add to one:4 result was 5 Please enter a positive Integer:10 got 10 back
  20. SubhanUllah
    Code Example : <html> <head> <style> h1{ font-size: 8px; } </style> </head> <body> <h1>Changing 1st heading size by Internal CSS<h1> <h1 style=”font-size:14px;”>Changing Second heading size by Inline CSS<h1> </body> </html>
  21. SubhanUllah
    The calc() CSS function lets you perform calculations when specifying CSS property values. It can be used anywhere a <length>, <frequency>, <angle>, <time>, <percentage>, <number>, or <integer> is allowed. Example: width: calc(100% - 80px); width: calc(10px + 100px); width: calc(100% - 30px); width: calc(2em * 5); width: calc(var(--variable-width) + 20px); Usage with integers: .modal { z-index: calc(3 / 2); }
  22. SubhanUllah
    Here is the HTML & CSS code for transparent button: <!DOCTYPE html> <html> <head> <style> button { background-color: #65d7f521; padding: 10px 20px; border: none; color: #00000091; } </style> </head> <body> <button>Button</button> </body> </html>
  23. SubhanUllah
    Try to parse it and catch any failure. There isn’t a more fool-proof way to check if JSON is valid than that. Something like this would work: function isValidJSON(s) { try { JSON.parse(s); return true; } catch (e) { } return false; } // Run a few test cases: console.log(`isValidJSON("4") = ${isValidJSON("4")}`); // prints true console.log(`isValidJSON("[4") = ${isValidJSON("[4")}`); // prints false console.log(`isValidJSON("[4]") = ${isValidJSON("[4]")}`); // prints true
  24. SubhanUllah
    Here is the HTML & CSS code for curved text: <!DOCTYPE html> <html lang="en"> <head> <!--Style to transform text in an arc --> <style type=text/css> /* Apply the translate and rotate transformation for our text to look curved */ .Q { transform: translate(20px, 85px) rotate(-30deg); } .u { transform: translate(13px, 55px) rotate(-25deg); } .o { transform: translate(6px, 35px) rotate(-20deg); } .r { transform: translate(3px, 23px) rotate(-15deg); } .a { transform: translate(2px, 14px) rotate(-10deg); } .A { transform: translate(1px, 8px) rotate(-5deg); } .n { transform: translate(0px, 5px) rotate(0deg); } .s { transform: translate(-1px, 8px) rotate(5deg); } .w { transform: translate(-2px, 14px) rotate(10deg); } .e { transform: translate(-3px, 25px) rotate(15deg); } .e { transform: translate(-6px, 30px) rotate(20deg); } .r1 { transform: translate(-14px, 50px) rotate(25deg); } .s1 { transform: translate(-24px, 68px) rotate(29deg); } /* An inline-block element is placed as an inline element (on the same line as adjacent content), but it behaves like a block element */ span { display: inline-block; } </style> </head> <body> <div style="text-align: center; padding-top: 250px; font-size: 55px; color: green;"> <!-- Declare all the characters of text one-by-one, inside span tags --> <span class="Q">Q</span> <span class="u">u</span> <span class="o">o</span> <span class="r">r</span> <span class="a">a</span> <span class="A">A</span> <span class="n">n</span> <span class="s">s</span> <span class="w">w</span> <span class="e">e</span> <span class="r1">r</span> <span class="s1">s</span> </div> </body> </html>
  25. SubhanUllah
    <img src=”NameOfThePic”> If it's in a different folder it's the same but with <img src=“FolderName/NameOfPic”>
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