C Projects

C Projects: Mini Examples for Practice

Once you understand C basics, functions, modular programming, and file handling, building small projects helps solidify knowledge and gain practical experience.

Here are some beginner-to-intermediate project ideas with examples.

1️⃣ Calculator Program (Modular)

Project Structure:

calculator.h

calculator.c

main.c

#include <stdio.h>
#include "calculator.h"

int main() {
int x = 10, y = 5;

printf("Add: %d\n", add(x, y));
printf("Subtract: %d\n", subtract(x, y));
printf("Multiply: %d\n", multiply(x, y));
printf("Divide: %.2f\n", divide(x, y));

return 0;
}

#include <stdio.h>

#include "calculator.h"

int main() {

int x = 10, y = 5;

printf("Add: %d\n", add(x, y));

printf("Subtract: %d\n", subtract(x, y));

printf("Multiply: %d\n", multiply(x, y));

printf("Divide: %.2f\n", divide(x, y));

return 0;

}

Compile & Run:

2️⃣ Number Guessing Game

Generates a random number between 1-100
User tries to guess until correct
Provides hints (higher/lower)

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
srand(time(0));
int number = rand() % 100 + 1;
int guess;

printf("Guess the number (1-100):\n");

do {
scanf("%d", &guess);
if(guess > number) printf("Lower!\n");
else if(guess < number) printf("Higher!\n");
else printf("Correct! Number was %d\n", number);
} while(guess != number);

return 0;
}

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int main() {

srand(time(0));

int number = rand() % 100 + 1;

int guess;

printf("Guess the number (1-100):\n");

do {

scanf("%d", &guess);

if(guess > number) printf("Lower!\n");

else if(guess < number) printf("Higher!\n");

else printf("Correct! Number was %d\n", number);

} while(guess != number);

return 0;

}

3️⃣ File Handling Example: Student Record System

Store student names and marks in a file
Add, display, and search records

#include <stdio.h>
#include <string.h>

struct Student {
char name[50];
int marks;
};

int main() {
FILE *fp = fopen("students.txt", "a+");
struct Student s;

printf("Enter Name and Marks: ");
scanf("%s %d", s.name, &s.marks);
fprintf(fp, "%s %d\n", s.name, s.marks);

rewind(fp);
printf("All Records:\n");
while(fscanf(fp, "%s %d", s.name, &s.marks) != EOF) {
printf("%s - %d\n", s.name, s.marks);
}

fclose(fp);
return 0;
}

#include <stdio.h>

#include <string.h>

struct Student {

char name[50];

int marks;

};

int main() {

FILE *fp = fopen("students.txt", "a+");

struct Student s;

printf("Enter Name and Marks: ");

scanf("%s %d", s.name, &s.marks);

fprintf(fp, "%s %d\n", s.name, s.marks);

rewind(fp);

printf("All Records:\n");

while(fscanf(fp, "%s %d", s.name, &s.marks) != EOF) {

printf("%s - %d\n", s.name, s.marks);

}

fclose(fp);

return 0;

}

4️⃣ Simple Banking System

Maintain account balance for multiple users
Deposit, Withdraw, Check Balance
Use structs and file handling

5️⃣ Dice Rolling Simulation

Simulates rolling two dice
Uses rand() and prints outcome
Can calculate probability statistics

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
srand(time(0));
int dice1 = rand() % 6 + 1;
int dice2 = rand() % 6 + 1;

printf("Dice 1: %d\nDice 2: %d\n", dice1, dice2);
printf("Total: %d\n", dice1 + dice2);

return 0;
}

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int main() {

srand(time(0));

int dice1 = rand() % 6 + 1;

int dice2 = rand() % 6 + 1;

printf("Dice 1: %d\nDice 2: %d\n", dice1, dice2);

printf("Total: %d\n", dice1 + dice2);

return 0;

}

Tips for Building C Projects

Use modular programming: separate header and source files
Include comments and documentation
Use Makefile for compilation automation
Validate user input
Use file handling for persistent data
Use random numbers for games or simulations
Test edge cases (division by zero, file not found, etc.)