/* Revesing a stack using recursion [0] [4] [1] [3] [2] ====> [2] [3] [1] [4] [0] Author : github.com/Anirudhece */ #include <bits/stdc++.h> using namespace std; void insertAtBottom(stack<int>& st , int element){ if(st.empty()){ st.push(element); } else{ int topElement= st.top(); st.pop(); insertAtBottom(st,element); st.push(topElement); } } void reverse(stack<int>& st){ if(st.empty()){ return; // base condition } int element= st.top(); st.pop(); reverse(st); insertAtBottom(st,element); } int main() { stack<int> stack1; stack<int> stack2; // push data into stack 1 (demoData-> 0 1 2 3) for (int i=0;i<4;i++) { st.push(i); } stack2 = stack1; cout << "Original Stack" << endl; while (!stack2.empty()) { cout << stack2.top() << " "; stack2.pop(); } cout<<endl; reverse(stack1); cout << "Reversed Stack" << endl; while (!stack1.empty()) { cout << stack1.top() << " "; stack1.pop(); } return 0; } /* Original Stack 3 2 1 0 Reversed Stack 0 1 2 3 */
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++
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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;
}
C++ is a widely used middle-level programming language.
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.
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;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
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
}
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);
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.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}