Question

Write a program that reads a string consisting of a positive integer or a positive decimal number and converts the number to the numeric format. If the string consists of a decimal number, the program must use a stack to convert the decimal number to the numeric format.

Answer 1

#include <iostream>

#include <string>

#include <stack>

#include <math.h>

using namespace std;

int main() {

string s;

double n=0;

int position=0;

stack<int> wholeNumbers;

cout<<"Enter a decimal number:";

cin>>s;

string::iterator counter = s.begin();

while(*counter!='.' && counter!=s.end()){

wholeNumbers.push(*counter-48);

counter++;

position=position+1;

}

for(int i=0;i<position;i++){

n=n+(wholeNumbers.top()*pow(10,i));

wholeNumbers.pop();

}

position=-1;

if(counter!=s.end()){

counter++;

}

while(counter!=s.end()){

n=n+((*counter-48)*pow(10,position));

position=position-1;

counter++;

}

cout<<n;

}

Step-by-step explanation:

• Inside the while loop, push the push a number to the wholeNumbers stack by subtracting it with 48.
• Increment the counter and position variable by 1 inside the while loop.
• Count the number of digit, push each digit to top of stack and find the end of the number,
• Run a for loop up to the value of position variable and pop a value from the wholeNumbers stack.