Basic-Calc

A console calculator in C++. Prompts for an operator and two numbers, prints the result to two decimal places, and loops until you decline another calculation.

Learning-exercise code from 2023 — small, single-file, no dependencies.

• Four operations: +, -, *, /
• Fixed two-decimal output (std::setprecision(2))
• Guards division by zero instead of producing inf
• Rejects an unknown operator with Invalid operator! and re-prompts
• Repeats while you answer y / Y

The source file is named cpp with no extension — pass it to the compiler explicitly, or rename it to main.cpp first.

g++ -x c++ -o basic-calc cpp
./basic-calc

Enter operator (+, -, *, /): *
Enter two numbers: 7 6
7.00 * 6.00 = 42.00
Do you want to perform another calculation? (y/n): n

Input is read with std::cin >> and is not validated — typing a non-number puts the stream into a fail state and the loop spins. Add cin.clear() + cin.ignore() handling if you want it robust.