C Calculator: Code Output & Display Guide

Code output when creating a calculator in C is crucial, determining the functionality and user experience. Mastering how to write this code will help you build an efficient and user-friendly pocket calculator.

Displaying Calculation Results: printf() in C

The printf() function is a powerful tool for displaying calculation results on the console screen. It allows you to format output strings, insert variables, and values flexibly. For example, after performing the addition of two numbers, you can print the result to the screen using printf("Sum is: %d", sum);.

Handling Special Cases: Division by 0, Negative Numbers, etc.

When building a calculator, you need to anticipate and handle special cases such as division by 0, entering negative numbers, or invalid operations. This ensures the program does not crash and provides helpful messages to the user. For example, when encountering division by 0, you can display the message “Error: Cannot divide by 0!”.

Output Code for Basic Operations (+, -, *, /)

Below is an example of how to write output code for basic operations in C:

#include <stdio.h>

int main() {
    int num1, num2;
    char operation;

    printf("Enter the first number: ");
    scanf("%d", &num1);

    printf("Enter the second number: ");
    scanf("%d", &num2);

    printf("Enter the operation (+, -, *, /): ");
    scanf(" %c", &operation); // Note the space before %c

    switch (operation) {
        case '+':
            printf("Result: %dn", num1 + num2);
            break;
        case '-':
            printf("Result: %dn", num1 - num2);
            break;
        case '*':
            printf("Result: %dn", num1 * num2);
            break;
        case '/':
            if (num2 == 0) {
                printf("Error: Cannot divide by 0!n");
            } else {
                printf("Result: %fn", (float)num1 / num2);
            }
            break;
        default:
            printf("Invalid operation!n");
    }

    return 0;
}

Conclusion

Writing output code when creating a calculator in C requires meticulousness and understanding of input/output handling functions, as well as how to handle special cases. Hopefully, this article has provided you with the necessary knowledge to build an effective pocket calculator.

FAQ

1. What is the printf() function used for? (Displaying data on the console screen)
2. Why is it necessary to handle the case of division by 0? (To prevent program errors)
3. How to display results in floating-point format? (Use %f in printf() and cast the variable to float)
4. What is the %d character in printf() used for? (Displaying integers)
5. How to input a character from the keyboard? (Use scanf(" %c", &variable);)
6. Why is there a space before %c in scanf? (To skip the newline character left in the buffer)
7. How to handle invalid operations? (Use the switch-case and default statements)

Suggested Questions and Articles on Our Website

• Basic C programming tutorial
• Input and output functions in C
• Building console applications in C

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