C Projects
Projects and Practical Applications
Learn how to apply your C knowledge to real-world projects.
In this section, we will build mini applications using the features you've learned throughout the tutorial.
Why Build Projects?
Projects are an essential part of learning C. Start small and gradually add more features:
- Understand how real programs are structured
- Practice combining concepts (e.g., functions, loops, file handling)
- Improve your debugging and problem-solving skills
- Prepare for job interviews and relevant exercises
Tip: The more you build, the better you understand.
Project Examples
Some examples of fun C projects could be:
- Calculate a Students Average
- Simple Calculator
- Address Book
- To-Do List
- Guess a Number Game
- Quiz Game
Project: Calculate a Students Average
Let's create a program to calculate a student's average from multiple grades.
The program asks the user to enter 1 to 5 grades and calculates the average. Then display the average and a corresponding letter grade (A to F):
Example
// This function returns a letter grade based on the average
char gradeFunction(double avg) {
if (avg >= 90) return 'A';
else if (avg >= 80) return 'B';
else if (avg >= 70) return 'C';
else if (avg >= 60) return 'D';
else return 'F';
}
int main(void) {
int count;
double sum = 0, grade;
// Ask the user to enter total grades between 1 to 5
printf("How many grades (1 to 5)? ");
scanf("%d", &count);
// Validate that count is
between 1 and 5
if (count < 1 || count > 5) {
printf("Invalid number. You must enter between 1 and 5 grades.\n");
return 1; // Exit
}
// Loop to collect each grade
for (int i = 1; i <= count; i++) {
printf("Enter grade %d: ", i);
scanf("%lf", &grade);
sum += grade;
}
// Calculate the average score
double avg = sum / count;
// Display
numeric average
printf("Average: %.2f\n", avg);
// Display letter grade
printf("Letter grade: %c\n", gradeFunction(avg));
return 0;
}
Example output:
How many grades (1 to 5)? 3
Enter grade 1: 85
Enter grade 2: 91
Enter grade 3: 78
Average: 84.6667
Letter grade: B
Key Concepts Used: loops, functions, conditions, input handling, and basic logic.
Practice Challenge
Try to make your own projects. For example, write a program that:
- Asks for your name
- Asks for your age
- Prints:
Hi <name>! You will turn <age+1> next year.
Open CodeBlocks or any similar IDE for C, and experiment on your own!
Start small. Add one feature at a time. Remember to test often!
Tip: We have also gathered a set of simple projects in our Real Life Examples page.
