In a few sentences, describe what does the program do? and show the result of the execution: #include #include #include using namespace std; #define maxchars 100 int main() { char input_str[maxchars+1], *p; stack num_stack; int c; double a, b, n; cout << "Enter string: "; cin.getline(input_str, maxchars); p = strtok(input_str, " "); while (p) { c = p[0]; if (c == '+' || c == '*' || c == '/' || c == '-') { if (num_stack.size() < 2) { cout << "Error: too many ops." << endl; system("pause"); return -1; } b = num_stack.top(); num_stack.pop(); a = num_stack.top(); num_stack.pop(); switch (c) { case '+': n = a + b; break; case '*': n = a * b; break; case '/': n = a / b; break; case '-': n = a - b; break; } num_stack.push(n); } else { num_stack.push(atof(p)); } p = strtok(NULL, " "); } cout << "The answer is: " << num_stack.top() << endl; system("pause"); return 0; }
In a few sentences, describe what does the program do? and show the result of the execution:
#include <iostream>
#include <cstring>
#include <stack>
using namespace std;
#define maxchars 100
int main()
{
char input_str[maxchars+1], *p;
stack<double> num_stack;
int c;
double a, b, n;
cout << "Enter string: ";
cin.getline(input_str, maxchars);
p = strtok(input_str, " ");
while (p)
{
c = p[0];
if (c == '+' || c == '*' || c == '/' || c == '-')
{
if (num_stack.size() < 2)
{
cout << "Error: too many ops." << endl;
system("pause");
return -1;
}
b = num_stack.top();
num_stack.pop();
a = num_stack.top();
num_stack.pop();
switch (c)
{
case '+': n = a + b;
break;
case '*': n = a * b;
break;
case '/': n = a / b;
break;
case '-': n = a - b;
break;
}
num_stack.push(n);
}
else
{
num_stack.push(atof(p));
}
p = strtok(NULL, " ");
}
cout << "The answer is: " << num_stack.top() << endl;
system("pause");
return 0;
}
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