[How to add lines to an existing file in Python?]

import datetime 
While True: 
        my_now = datetime.datetime.now().strftime("%d.%b %Y %H:%M:%S") 
        myfile =  open("my_file.txt", "a")         
        myfile.write("Added at {my_now}") 
        myfile.close() 
        sleep (100) 

 

[How to convert an integer into its corresponding ASCII value in the C programming language?]

#include <stdio.h> 
 
int main(){ 
        for(int i = 0x20; i<0x30; i++){ 
                printf("%d ", i); 
                printf("%c\n", i); 
        } 
} 

 

[How to swap integer values without using a function in C++?]

int a = 6; 
int b = 2; 
std::cout << "a=" << a << " b=" << b << "\n"; 
int temp = a; 
a = b; 
b = temp; 
std::cout << "a=" << a << " b=" << b << "\n";

 

[How to convert a date into a string in the C/C++ programming languages?]

#include <stdio.h> 
#include <time.h> 
 
int main(){ 
        time_t ct;                // current time 
        struct tm *lt;        // local time 
        ct = time(NULL); 
        lt = localtime(&ct); 
        printf("%s\n", asctime(lt)); 
} 

 

[How to draw a box on the screen using the C programming language?]

#include "../x11.c" 
 
int main(){ 
        xopen(0,0,"box"); 
        xclear_color(ORN); 
        xcolor(BLU); 
        xrectangle(44,44,200,100,0); 
        xgetc(); 
        xclose(); 
} 

 

[How to write a program in the C programming language that returns two values from one function call?]

typedef struct { 
    int x; 
    int y; 
} point_t; 
 
point_t some_func(void) { 
    point_t pt; 
    pt.x = 0; 
    pt.y = 0; 
    return pt; 
} 

 

[Can a function be used in an if statement?]

Yes

if (someValue == someOtherValue) 
{ 
  someFunction(); 
} 

 

[How to write a code about how many times a given integer number is divisible by 2 in C++?]

Let’s consider the integer 6.

6/2=3

6/2=3

6/2=3

[What is the floatval() function in PHP?]

The floatval() function return the float value of the variable passed to it. For example:

$integer = 123; 
$float = floatval($integer); 
var_dump($integer); // int(123) 
var_dump($float); // float(123) 

 

[What is the difference between calling a function by name or by pointer in C++?]

Here is the example:

void foo(void) { 
    printf(“foo was called\n”); 
} 
if you do this:

foo(); 

then you’re calling do by name. If you do:

void (*func_ptr)(void) = foo; 
func_ptr(); 

Then you’re calling foo through function pointer func_ptr().

[How to pass a function argument by value or reference in the programming language C++?]

void f(int i) { i = i + 1; } 
void g(int &i) { i = i + 1; } 
 
int main() { 
        int i = 1; 
        f(i); // by value: i is still 1 
        g(i); // by reference: i is now 2 
        return 0; 
} 

 

[How to avoid copying an array when passing it as a parameter to a function in C++?]

int x[] = {1,2,3,4}; 
 
void print(int *arr, size_t n) { 
    for (size_t i = 0; i < n; i++) { 
        printf(“%d\n”); 
    } 
} 
 
print(x, 4); 

 

[How to use a for loop in order to count down instead of up?]

#include <stdio.h>

int main() {

for (int a=20;a>=10;--a){

// Write C code here

printf("Hello world");

}

return 0;

}

 

[How to declare and initialize an array in the C++ programming language?]

int x[] = {1, 2, 3, 4}; 

 

You could also use a length:

int x[4] = {1, 2, 3, 4}; 

 

[How to declare and initialize an array in the C++ programming language?]

int x[] = {1, 2, 3, 4}; 

 

You could also use a length:

int x[4] = {1, 2, 3, 4}; 

 

[How to print multiple lines of text next to each other in Python?]

print("Now is the winter ",end ="") # no line feed 
print("of our discontent") # yes Line Feed 
print("Made glorious summer",end="") 
print(" by this sun of York;") 
print("And all the clouds that ",end="") 
print("lour'd upon our house") 
print("In the deep bosom of",end="") 
print(" the ocean buried.")

Output

Now is the winter of our discontent 
Made glorious summer by this sun of York; 
And all the clouds that lour'd upon our house 
In the deep bosom of the ocean buried. 

 

[How do you fill arrays in Java?]

// One of these things is not like the others. 
// One of these things just doesn't belong. 
String[] items = new String[] { 
   "Apple", 
   "Orange", 
   "Spider", 
   "Banana", 
}; 
// Note that you CAN use a comma after the last item! 
// This is a convenience if you need to re-order the items. 

 

[How to declare multiple variables inside one for statement in C++?]

for (int i = 0, j = 0; i < 5; ++i, ++j) 
{ 
  std::cout << i << ' ' << j << '\n'; 
} 

 

[How do you find a sum of a specific range in a PHP array?]

$array = [1, 2, 3, 4, 6, 7, 8]; 
 
$from = 2;  // array offset 1 
$to = 4;  // array offset 4 
$sum = 0; 
 
for($i = $from; $i <= $to; $i++ ){ 
  $sum = $sum + $array[$i]; 
} 
 
echo $sum; // 15  

 

[How would you print a clock in the C programming language?]

#include <stdio.h> 
#include <time.h> 
 
int main(){ 
        time_t ct;                // current time 
        struct tm *lt;        // local time 
        ct = time(NULL); 
        lt = localtime(&ct); 
        printf("%s\n", asctime(lt)); 
} 

 

[What is the difference between char *str and char str [] in C?]

#include <stdio.h> 
 
int main(){ 
        char *str1 = "abc"; 
        char str2[] = "def"; 
        printf("%s - %s\n", str1, str2); 
} 

 

[How to print an array without using pointers in C++?]

 

Use array indices instead.

int arr[5] = {11, 22, 33, 44, 55}; 
 
for (int i = 0; i < 5; i++) { 
    printf(“arr[%d] = %d\n”, i, arr[i]); 
} 

 

[How to use jQuery on multiple elements at once?]

<script> 
 $( "div, span, p.myClass" ).css( "border", "3px solid red" ); 
</script> 

 

[How to return an array from a PHP function?]

A function can return a value of any datatype that is available in PHP.

function returnArray(){ 
  $arr = [2, 4, 6]; 
  return $arr; 
} 
 
/* 
 * outputs: 
 * Array( 
  [0] => int(2) 
  [1] => int(4) 
  [2] => int(6) 
 )  
*/ 
var_dump(returnArray()); 

 

[What are some ways to make a website responsive without using any third party tools?]

 

You can use media query CSS to make a website responsive without using any third party tools. Example code:

<!DOCTYPE html> 
<html> 
<head> 
<meta name="viewport" content="width=device-width, initial-scale=1.0"> 
<style> 
* { 
  box-sizing: border-box; 
} 
.row::after { 
  content: ""; 
  clear: both; 
  display: block; 
} 
[class*="col-"] { 
  float: left; 
  padding: 15px; 
} 
html { 
  font-family: "Lucida Sans", sans-serif; 
} 
.header { 
  background-color: #9933cc; 
  color: #ffffff; 
  padding: 15px; 
} 
.menu ul { 
  list-style-type: none; 
  margin: 0; 
  padding: 0; 
} 
.menu li { 
  padding: 8px; 
  margin-bottom: 7px; 
  background-color: #33b5e5; 
  color: #ffffff; 
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); 
} 
.menu li:hover { 
  background-color: #0099cc; 
} 
.aside { 
  background-color: #33b5e5; 
  padding: 15px; 
  color: #ffffff; 
  text-align: center; 
  font-size: 14px; 
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); 
} 
.footer { 
  background-color: #0099cc; 
  color: #ffffff; 
  text-align: center; 
  font-size: 12px; 
  padding: 15px; 
} 
/* For desktop: */ 
.col-1 {width: 8.33%;} 
.col-2 {width: 16.66%;} 
.col-3 {width: 25%;} 
.col-4 {width: 33.33%;} 
.col-5 {width: 41.66%;} 
.col-6 {width: 50%;} 
.col-7 {width: 58.33%;} 
.col-8 {width: 66.66%;} 
.col-9 {width: 75%;} 
.col-10 {width: 83.33%;} 
.col-11 {width: 91.66%;} 
.col-12 {width: 100%;} 
@media only screen and (max-width: 768px) { 
  /* For mobile phones: */ 
  [class*="col-"] { 
  width: 100%; 
  } 
} 
</style> 
</head> 
<body> 
<div class="header"> 
  <h1>Bangladesh</h1> 
</div> 
<div class="row"> 
  <div class="col-3 menu"> 
  <ul> 
  <li>The Flight</li> 
  <li>The City</li> 
  <li>The Island</li> 
  <li>The Food</li> 
  </ul> 
  </div> 
  <div class="col-6"> 
  <h1>The City</h1> 
  <p>Bangladesh is the capital of the Bangladesh region on the island of Crete. The city can be divided in two parts, the old town and the modern city.</p> 
  </div> 
  <div class="col-3 right"> 
  <div class="aside"> 
  <h2>What?</h2> 
  <p>Bangladesh is a city on the island of Crete.</p> 
  <h2>Where?</h2> 
  <p>Crete is a Greek island in the Mediterranean Sea.</p> 
  <h2>How?</h2> 
  <p>You can reach Bangladesh airport from all over Europe.</p> 
  </div> 
  </div> 
</div> 
<div class="footer"> 
  <p>Resize the browser window to see how the content respond to the resizing.</p> 
</div> 
</body> 
</html>