#include<iostream>
#include<string>
using namespace std;
class Stack {
private:
int top;
int arr[5];
public:
Stack() {
top = -1;
for (int i = 0; i < 5; i++) {
arr[i] = 0;
}
}
bool isEmpty() {
if (top == -1)
return true;
else
return false;
}
bool isFull() {
if (top == 4)
return true;
else
return false;
}
void push(int val) {
if (isFull()) {
cout << "stack overflow" << endl;
} else {
top++; // 1
arr[top] = val;
}
}
int pop() {
if (isEmpty()) {
cout << "stack underflow" << endl;
return 0;
} else {
int popValue = arr[top];
arr[top] = 0;
top--;
return popValue;
}
}
int count() {
return (top + 1);
}
int peek(int pos) {
if (isEmpty()) {
cout << "stack underflow" << endl;
return 0;
} else {
return arr[pos];
}
}
void change(int pos, int val) {
arr[pos] = val;
cout << "value changed at location " << pos << endl;
}
void display() {
cout << "All values in the Stack are " << endl;
for (int i = 4; i >= 0; i--) {
cout << arr[i] << endl;
}
}
};
int main() {
Stack s1;
int option, postion, value;
do {
cout << "What operation do you want to perform? Select Option number. Enter 0 to exit." << endl;
cout << "1. Push()" << endl;
cout << "2. Pop()" << endl;
cout << "3. isEmpty()" << endl;
cout << "4. isFull()" << endl;
cout << "5. peek()" << endl;
cout << "6. count()" << endl;
cout << "7. change()" << endl;
cout << "8. display()" << endl;
cout << "9. Clear Screen" << endl << endl;
cin >> option;
switch (option) {
case 0:
break;
case 1:
cout << "Enter an item to push in the stack" << endl;
cin >> value;
s1.push(value);
break;
case 2:
cout << "Pop Function Called - Poped Value: " << s1.pop() << endl;
break;
case 3:
if (s1.isEmpty())
cout << "Stack is Empty" << endl;
else
cout << "Stack is not Empty" << endl;
break;
case 4:
if (s1.isFull())
cout << "Stack is Full" << endl;
else
cout << "Stack is not Full" << endl;
break;
case 5:
cout << "Enter position of item you want to peek: " << endl;
cin >> postion;
cout << "Peek Function Called - Value at position " << postion << " is " << s1.peek(postion) << endl;
break;
case 6:
cout << "Count Function Called - Number of Items in the Stack are: " << s1.count() << endl;
break;
case 7:
cout << "Change Function Called - " << endl;
cout << "Enter position of item you want to change : ";
cin >> postion;
cout << endl;
cout << "Enter value of item you want to change : ";
cin >> value;
s1.change(postion, value);
break;
case 8:
cout << "Display Function Called - " << endl;
s1.display();
break;
case 9:
system("cls");
break;
default:
cout << "Enter Proper Option number " << endl;
}
} while (option != 0);
return 0;
}
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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
}