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for (i=0; i<100; i++) foo.x[i]=500+i; for (i=0; i<10; i++) foo.y[i]=700+i; foo.var1 = 640; cout << sizeof(*s) << "\n"; cout << sizeof(*p) << "\n"; cout << sizeof(*l) << "\n"; q = (int *) &foo; cout << q << "\n"; p=&(foo.x[5]); cout << *p << "\n"; // POINT 1 q = (int *) &var2; cout << q << "\n"; q = p+16; cout << *q << "\n"; i = ((long) p) + 16; q = (int *) i; cout << *q << "\n"; s = (short *) i; cout << *s << "\n"; l = (long *) i; cout << *l << "\n"; q = p+95; cout << *q << "\n"; // EXPLAIN q = p+98; cout << *q << "\n"; i = ((long) p) + 17; q = (int *) i; cout << *q << "\n"; q = p + _______; cout << *q << "\n"; q = (int *) (((long) p) + ______); cout << *q << "\n"; p = (int *) bar; *(p + _______) = 847; cout << bar[8].var1 << "\n";

STDIN

<textarea aria-hidden="true" class="MuiInputBase-input MuiOutlinedInput-input MuiInputBase-inputMultiline MuiOutlinedInput-inputMultiline" readonly="" tabindex="-1" style=";overflow:hidden;height:0;top:0;left:0;transform:translateZ(0)"/><fieldset aria-hidden="true" class="jss69 MuiOutlinedInput-notchedOutline jss34"><legend class="jss71 jss72"><span>STDIN</span></legend></fieldset></div></div></div><div class="  jss38   
                             
                           jss23  "><p>Output:</p><div><pre>Main.cpp:5:3: error: expected constructor, destructor, or type conversion before ‘struct’
    5 |   struct foo_t {
      |   ^~~~~~
Main.cpp:9:7: error: ‘foo’ does not name a type
    9 |     } foo;
      |       ^~~
Main.cpp:15:16: error: elements of array ‘foo_t bar [50]’ have incomplete type
   15 |   struct foo_t bar[50];
      |                ^~~
Main.cpp:15:16: error: storage size of ‘bar’ isn’t known
Main.cpp:17:3: error: expected unqualified-id before ‘for’
   17 |   for (i=0; i<100; i++) foo.x[i]=500+i;
      |   ^~~
Main.cpp:17:13: error: ‘i’ does not name a type
   17 |   for (i=0; i<100; i++) foo.x[i]=500+i;
      |             ^
Main.cpp:17:20: error: ‘i’ does not name a type
   17 |   for (i=0; i<100; i++) foo.x[i]=500+i;
      |                    ^
Main.cpp:18:3: error: expected unqualified-id before ‘for’
   18 |   for (i=0; i<10; i++)  foo.y[i]=700+i;
      |   ^~~
Main.cpp:18:13: error: ‘i’ does not name a type
   18 |   for (i=0; i<10; i++)  foo.y[i]=700+i;
      |             ^
Main.cpp:18:19: error: ‘i’ does not name a type
   18 |   for (i=0; i<10; i++)  foo.y[i]=700+i;
      |                   ^
Main.cpp:19:3: error: ‘foo’ does not name a type; did you mean ‘foo_t’?
   19 |   foo.var1 = 640;
      |   ^~~
      |   foo_t
Main.cpp:21:3: error: ‘cout’ does not name a type
   21 |   cout << sizeof(*s) << "\n";
      |   ^~~~
Main.cpp:22:3: error: ‘cout’ does not name a type
   22 |   cout << sizeof(*p) << "\n";
      |   ^~~~
Main.cpp:23:3: error: ‘cout’ does not name a type
   23 |   cout << sizeof(*l) << "\n";
      |   ^~~~
Main.cpp:24:3: error: ‘q’ does not name a type
   24 |   q = (int *) &foo;    cout << q << "\n";
      |   ^
Main.cpp:24:24: error: ‘cout’ does not name a type
   24 |   q = (int *) &foo;    cout << q << "\n";
      |                        ^~~~
Main.cpp:25:3: error: ‘p’ does not name a type
   25 |   p=&(foo.x[5]);       cout << *p << "\n";
      |   ^
Main.cpp:25:24: error: ‘cout’ does not name a type
   25 |   p=&(foo.x[5]);       cout << *p << "\n";
      |                        ^~~~
Main.cpp:27:3: error: ‘q’ does not name a type
   27 |   q = (int *) &var2;   cout << q << "\n";
      |   ^
Main.cpp:27:24: error: ‘cout’ does not name a type
   27 |   q = (int *) &var2;   cout << q << "\n";
      |                        ^~~~
Main.cpp:28:3: error: ‘q’ does not name a type
   28 |   q = p+16;            cout << *q << "\n";
      |   ^
Main.cpp:28:24: error: ‘cout’ does not name a type
   28 |   q = p+16;            cout << *q << "\n";
      |                        ^~~~
Main.cpp:29:3: error: ‘i’ does not name a type
   29 |   i = ((long) p) + 16;
      |   ^
Main.cpp:30:3: error: ‘q’ does not name a type
   30 |   q = (int *) i;       cout << *q << "\n";
      |   ^
Main.cpp:30:24: error: ‘cout’ does not name a type
   30 |   q = (int *) i;       cout << *q << "\n";
      |                        ^~~~
Main.cpp:31:3: error: ‘s’ does not name a type
   31 |   s = (short *) i;     cout << *s << "\n";
      |   ^
Main.cpp:31:24: error: ‘cout’ does not name a type
   31 |   s = (short *) i;     cout << *s << "\n";
      |                        ^~~~
Main.cpp:32:3: error: ‘l’ does not name a type
   32 |   l = (long *) i;      cout << *l << "\n";
      |   ^
Main.cpp:32:24: error: ‘cout’ does not name a type
   32 |   l = (long *) i;      cout << *l << "\n";
      |                        ^~~~
Main.cpp:33:3: error: ‘q’ does not name a type
   33 |   q = p+95;            cout << *q << "\n";  // EXPLAIN
      |   ^
Main.cpp:33:24: error: ‘cout’ does not name a type
   33 |   q = p+95;            cout << *q << "\n";  // EXPLAIN
      |                        ^~~~
Main.cpp:34:3: error: ‘q’ does not name a type
   34 |   q = p+98;            cout << *q << "\n";
      |   ^
Main.cpp:34:24: error: ‘cout’ does not name a type
   34 |   q = p+98;            cout << *q << "\n";
      |                        ^~~~
Main.cpp:35:3: error: ‘i’ does not name a type
   35 |   i = ((long) p) + 17;
      |   ^
Main.cpp:36:3: error: ‘q’ does not name a type
   36 |   q = (int *) i;       cout << *q << "\n";
      |   ^
Main.cpp:36:24: error: ‘cout’ does not name a type
   36 |   q = (int *) i;       cout << *q << "\n";
      |                        ^~~~
Main.cpp:37:3: error: ‘q’ does not name a type
   37 |   q = p + _______;     cout << *q << "\n";
      |   ^
Main.cpp:37:24: error: ‘cout’ does not name a type
   37 |   q = p + _______;     cout << *q << "\n";
      |                        ^~~~
Main.cpp:38:3: error: ‘q’ does not name a type
   38 |   q = (int *) (((long) p) + ______);  cout << *q << "\n";
      |   ^
Main.cpp:38:39: error: ‘cout’ does not name a type
   38 |   q = (int *) (((long) p) + ______);  cout << *q << "\n";
      |                                       ^~~~
Main.cpp:39:3: error: ‘p’ does not name a type
   39 |   p = (int *) bar;
      |   ^
Main.cpp:40:6: error: expected ‘)’ before ‘+’ token
   40 |   *(p + _______) = 847; cout << bar[8].var1 << "\n";
      |    ~ ^~
      |      )
Main.cpp:40:25: error: ‘cout’ does not name a type
   40 |   *(p + _______) = 847; cout << bar[8].var1 << "\n";
      |                         ^~~~</pre></div></div></div></div></div><div><div class="jss28"><span class="MuiTypography-root MuiTypography-caption MuiTypography-gutterBottom"><span itemprop="datePublished" datetime="2022-09-19">created 1 year ago  </span></span></div></div></div></div><div class="oc-theme-light" style="margin-top:24px"><div class="md-view oc-theme-null "><h1>C++ Online Compiler</h1><p>Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code  when you choose language as <code>C++</code> and start coding!</p><h1>Read inputs from stdin</h1><p>OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.</p><pre><code class="language-c">#include <iostream>
#include <string>
using namespace std;
int main() 
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}</code></pre><h1>About C++</h1><p>C++ is a widely used middle-level programming language.</p><ul><li>Supports different platforms like Windows, various Linux flavours, MacOS etc</li><li>C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.</li><li>Case-sensitive</li><li>C++ is a compiler based language</li><li>C++ supports structured programming language</li><li>C++ provides alot of inbuilt functions and also supports dynamic memory allocation.</li><li>Like C, C++ also allows you to play with memory using Pointers.</li></ul><h1>Syntax help</h1><h2>Loops</h2><h3>1. If-Else:</h3><p>When ever you want to perform a set of operations based on a condition If-Else is used.</p><pre><code class="language-c">if(conditional-expression) {
   //code
else {
   //code
}</code></pre><p>You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.</p><h3>2. Switch:</h3><p>Switch is an alternative to If-Else-If ladder.</p><pre><code class="language-c">switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
default:     
 code to be executed when all the above cases are not matched;    
} </code></pre><h3>3. For:</h3><p>For loop is used to iterate a set of statements based on a condition.</p><pre><code class="language-c">for(Initialization; Condition; Increment/decrement){  
  //code  
} </code></pre><h3>4. While:</h3><p>While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.</p><pre><code class="language-c">while (condition) {