/*###Begin banned keyword - each of the following line if appear in code will raise error. regex supported
define
include
class
strlen
strcat
string
strcmp
strcpy
memmove
strstr
###End banned keyword*/

#include <iostream>
#include <string.h>
using namespace std;
#define MAX 300

int myStrlen(char s[], int k);
void myStrcpy(char s[], int vt, char s1[], int k);
void mySubstr(char s[], int b, int count, char ss[]);
bool myStrcat(char s1[], char s2[]);
void ChenChuoiTaiVitriK(char s[], char s1[], int k);

int main()
{
	char s[MAX], s1[MAX];
	fgets(s, MAX, stdin);
	fgets(s1, MAX, stdin);
	int k;
	cin >> k;
	if (k < 0 || k>myStrlen(s, 0))
		cout << "Vi tri " << k << " khong thoa dieu kien." << endl;
	else
	{
	  ChenChuoiTaiVitriK(s, s1, k);
	  cout << s;
	}
	return 0;
}

int myStrlen(char s[], int k){
  while (s[k] != '\n') k++;
  return k;
}
  
void ChenChuoiTaiVitriK(char s[], char s1[], int k){
  int k0 = myStrlen(s, 0), k1 = myStrlen(s1, 0), t = 0;
  for (int i = k0 + k1 - 1; i >= k; i--){
    s[i] = s[i - k1];
  }
  for (int i = k; i < k + k1; i++){
    s[i] = s1[t];
    t++;
  }
  cout << k0 << " " << k1 << " " << k << endl;
}
by

C++ Online Compiler

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 C++ and start coding!

Read inputs from stdin

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.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

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.

2. Switch:

Switch is an alternative to If-Else-If ladder.

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;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

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.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}