Mastering Basic Arithmetic Operations in C Programming

Introduction

Arithmetic operations such as addition, subtraction, multiplication, and division are fundamental operations in programming. In this lab, we will show you how to write a C program to perform basic arithmetic operations and how the C language handles typecasting.

Set up the Basic Structure

Before we start, make sure you have a C compiler installed on your machine. Open your text editor and create a new file named "main.c" in the ~/project/ directory.

Let's start by including the stdio.h header file and writing the main function:

#include<stdio.h> int main() { return 0; } 

Ask for User Input

Ask the user to input two integers using the scanf() function. Declare the variables to store these integers as int a and int b.

#include<stdio.h> int main() { int a, b; printf("Enter two integers: "); scanf("%d%d", &a, &b); return 0; } 

Perform Basic Arithmetic Operations Without Typecasting

Now, let's perform basic arithmetic operations without typecasting. Declare variables to store the results of the arithmetic operations as add, subtract, multiply, and divide.

#include<stdio.h> int main() { int a, b, add, subtract, multiply; float divide; printf("Enter two integers: "); scanf("%d%d", &a, &b); add = a + b; subtract = a - b; multiply = a * b; divide = a / b; printf("Addition of the numbers = %d\n", add); printf("Subtraction of 2nd number from 1st = %d\n", subtract); printf("Multiplication of the numbers = %d\n", multiply); printf("Dividing 1st number from 2nd = %f\n", divide); return 0; } 

Perform Basic Arithmetic Operations With Typecasting

C language handles typecasting implicitly. However, we can handle it explicitly in our programs too. Let's write a C program that performs basic arithmetic operations with typecasting.

Declare variables to store the results of the arithmetic operations as add, subtract, multiply, divide, and remainder.

#include<stdio.h> int main() { int a, b, add, subtract, multiply, remainder; float divide; printf("Enter two integers: "); scanf("%d%d", &a, &b); add = a + b; subtract = a - b; multiply = a * b; divide = a / (float)b; remainder = a % b; printf("Addition of the numbers = %d\n", add); printf("Subtraction of 2nd number from 1st = %d\n", subtract); printf("Multiplication of the numbers = %d\n", multiply); printf("Dividing 1st number from 2nd = %f\n", divide); printf("Remainder on Dividing 1st number by 2nd is %d\n", remainder); return 0; } 

Compile and Run the Program

Save the main.c file. Open your terminal in the ~/project/ directory where you saved your file and compile the program using the following command:

gcc -o main main.c 

This will create an executable file named main. Run the program using the following command:

./main 

Test the Program

Test the program by inputting two integers and check if the program is performing the arithmetic operations as expected.

Full Code

#include<stdio.h> int main() { int a, b, add, subtract, multiply, remainder; float divide; printf("Enter two integers: "); scanf("%d%d", &a, &b); add = a + b; subtract = a - b; multiply = a * b; divide = a / (float)b; remainder = a % b; printf("Addition of the numbers = %d\n", add); printf("Subtraction of 2nd number from 1st = %d\n", subtract); printf("Multiplication of the numbers = %d\n", multiply); printf("Dividing 1st number from 2nd = %f\n", divide); printf("Remainder on Dividing 1st number by 2nd is %d\n", remainder); return 0; } 

Summary

In this lab, we have learned how to write a C program to perform basic arithmetic operations and how the C language handles typecasting. We have demonstrated how to perform basic arithmetic operations with and without typecasting. Finally, we have compiled and run the program to test its functionalities.

🚀 Practice Now: Basic Arithmetic Operations

Want to Learn More?

• 🌳 Learn the latest C Skill Trees
• 📖 Read More C Tutorials
• 💬 Join our Discord or tweet us @WeAreLabEx