C Programming Calculator Project

One popular C programming project is building a simple calculator. 

The calculator can perform basic arithmetic operations such as addition, subtraction, multiplication, and division. The code for the calculator can be as follows:

  #include <stdio.h> int main() { char operator; double firstNumber, secondNumber; printf("Enter an operator (+, -, *, /): "); scanf("%c", &operator); printf("Enter two operands: "); scanf("%lf %lf", &firstNumber, &secondNumber); switch (operator) { case '+': printf("%.1lf + %.1lf = %.1lf", firstNumber, secondNumber, firstNumber + secondNumber); break; case '-': printf("%.1lf - %.1lf = %.1lf", firstNumber, secondNumber, firstNumber - secondNumber); break; case '*': printf("%.1lf * %.1lf = %.1lf", firstNumber, secondNumber, firstNumber * secondNumber); break; case '/': if (secondNumber == 0) { printf("Error: Division by zero"); } else { printf("%.1lf / %.1lf = %.1lf", firstNumber, secondNumber, firstNumber / secondNumber); } break; default: printf("Error: Invalid operator"); } return 0; }

Explanation:

• The #include <stdio.h> line includes the standard input/output library in the program.

• The int main() function is the starting point of the program.

• The char operator; line declares a variable called operator of the type char, which will store the arithmetic operator entered by the user.

• The double firstNumber, secondNumber; line declares two variables called firstNumber and secondNumber of the type double, which will store the operands entered by the user.

• The printf("Enter an operator (+, -, *, /): "); line prompts the user to enter an arithmetic operator.

• The scanf("%c", &operator); line reads the operator entered by the user and stores it in the operator variable.

• The printf("Enter two operands: "); line prompts the user to enter two operands.

• The scanf("%lf %lf", &firstNumber, &secondNumber); line reads the operands entered by the user and stores them in the firstNumber and secondNumber variables.

• The switch statement is used to perform different actions based on the value of the operator variable.

• Inside the switch statement, there are several case labels for each arithmetic operator.

• The corresponding action for each operator is performed inside the corresponding case block.

• For example, if the operator is '+', the program will print the result of the addition of the two operands.

• If an invalid operator is entered by the user, the program will print an error message.

This is a simple calculator project that can give you an idea on how to use basic arithmetic operations and take inputs using scanf function.

Please let me know if you would like me to add or change any specific information in the blog post.