Scientific Calculator in C++

1#include <iostream>
2#include <cmath>
3#include <iomanip>
4using namespace std;
5
6void displayMenu() {
7    cout << "\n=== SCIENTIFIC CALCULATOR ===" << endl;
8    cout << "1. Addition" << endl;
9    cout << "2. Subtraction" << endl;
10    cout << "3. Multiplication" << endl;
11    cout << "4. Division" << endl;
12    cout << "5. Power" << endl;
13    cout << "6. Square Root" << endl;
14    cout << "7. Sine" << endl;
15    cout << "8. Cosine" << endl;
16    cout << "9. Tangent" << endl;
17    cout << "10. Logarithm" << endl;
18    cout << "11. Exit" << endl;
19    cout << "Enter your choice: ";
20}
21
22int main() {
23    int choice;
24    double num1, num2, result;
25    
26    do {
27        displayMenu();
28        cin >> choice;
29        
30        switch(choice) {
31            case 1:
32                cout << "Enter two numbers: ";
33                cin >> num1 >> num2;
34                result = num1 + num2;
35                cout << "Result: " << result << endl;
36                break;
37            case 2:
38                cout << "Enter two numbers: ";
39                cin >> num1 >> num2;
40                result = num1 - num2;
41                cout << "Result: " << result << endl;
42                break;
43            case 3:
44                cout << "Enter two numbers: ";
45                cin >> num1 >> num2;
46                result = num1 * num2;
47                cout << "Result: " << result << endl;
48                break;
49            case 4:
50                cout << "Enter two numbers: ";
51                cin >> num1 >> num2;
52                if (num2 != 0) {
53                    result = num1 / num2;
54                    cout << "Result: " << result << endl;
55                } else {
56                    cout << "Error: Division by zero!" << endl;
57                }
58                break;
59            case 5:
60                cout << "Enter base and exponent: ";
61                cin >> num1 >> num2;
62                result = pow(num1, num2);
63                cout << "Result: " << result << endl;
64                break;
65            case 6:
66                cout << "Enter a number: ";
67                cin >> num1;
68                if (num1 >= 0) {
69                    result = sqrt(num1);
70                    cout << "Result: " << result << endl;
71                } else {
72                    cout << "Error: Cannot find square root of negative number!" << endl;
73                }
74                break;
75            case 7:
76                cout << "Enter angle in degrees: ";
77                cin >> num1;
78                result = sin(num1 * M_PI / 180.0);
79                cout << fixed << setprecision(4);
80                cout << "Result: " << result << endl;
81                break;
82            case 8:
83                cout << "Enter angle in degrees: ";
84                cin >> num1;
85                result = cos(num1 * M_PI / 180.0);
86                cout << fixed << setprecision(4);
87                cout << "Result: " << result << endl;
88                break;
89            case 9:
90                cout << "Enter angle in degrees: ";
91                cin >> num1;
92                result = tan(num1 * M_PI / 180.0);
93                cout << fixed << setprecision(4);
94                cout << "Result: " << result << endl;
95                break;
96            case 10:
97                cout << "Enter a number: ";
98                cin >> num1;
99                if (num1 > 0) {
100                    result = log(num1);
101                    cout << "Result: " << result << endl;
102                } else {
103                    cout << "Error: Logarithm undefined for non-positive numbers!" << endl;
104                }
105                break;
106            case 11:
107                cout << "Exiting..." << endl;
108                break;
109            default:
110                cout << "Invalid choice!" << endl;
111        }
112    } while(choice != 11);
113    
114    return 0;
115}