C is a versatile programming language used in a wide range of applications. Starting out by practicing with some fundamental programs is a smart approach when learning C.
You’ll find more than 20+ simple C programming practice programs in this blog article.
Practice Programs of C Programming
- A C program that prints “Hello, World!” to the screen.
#include <stdio.h>
int main() {
printf("Hello, World!\n");
return 0;
}- A C program that adds two numbers and prints the result.
#include <stdio.h>
int main() {
int num1, num2, sum;
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);
sum = num1 + num2;
printf("Sum: %d\n", sum);
return 0;
}- A C program that swaps the values of two numbers in between.
#include <stdio.h>
int main() {
int num1, num2, temp;
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);
temp = num1;
num1 = num2;
num2 = temp;
printf("After swapping:\n");
printf("First number: %d\n", num1);
printf("Second number: %d\n", num2);
return 0;
}- A C program that checks Whether a number is even or odd.
#include <stdio.h>
int main() {
int num;
printf("Enter a number: ");
scanf("%d", &num);
if (num % 2 == 0) {
printf("%d is even.\n", num);
} else {
printf("%d is odd.\n", num);
}
return 0;
}- A C program that checks whether a year is a leap year or not.
#include <stdio.h>
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
printf("%d is a leap year.\n", year);
} else {
printf("%d is not a leap year.\n", year);
}
return 0;
}- A C program that calculates the factorial of a given number.
#include <stdio.h>
int main() {
int num, factorial = 1, i;
printf("Enter a number: ");
scanf("%d", &num);
for (i = 1; i <= num; i++) {
factorial *= i;
}
printf("Factorial of %d: %d\n", num, factorial);
return 0;
}- A C program that checks whether a number is prime or not.
#include <stdio.h>
int main() {
int num, i, flag = 0;
printf("Enter a number: ");
scanf("%d", &num);
for (i = 2; i <= num / 2; i++) {
if (num % i == 0) {
flag = 1;
break;
}
}
if (flag == 0) {
printf("%d is a prime number.\n", num);
} else {
printf("%d is not a prime number.\n", num);
}
return 0;
}- A C program that prints the Fibonacci series of up to a given number of terms.
#include <stdio.h>
int main() {
int num, i, term1 = 0, term2 = 1, nextTerm;
printf("Enter the number of terms: ");
scanf("%d", &num);
printf("Fibonacci Series: ");
for (i = 1; i <= num; i++) {
printf("%d, ", term1);
nextTerm = term1 + term2;
term1 = term2;
term2 = nextTerm;
}
printf("\n");
return 0;
}- A C program that checks whether a number is a palindrome or not.
#include <stdio.h>
int main() {
int num, reversedNum = 0, remainder, originalNum;
printf("Enter a number: ");
scanf("%d", &num);
originalNum = num;
while (num != 0) {
remainder = num % 10;
reversedNum = reversedNum * 10 + remainder;
num /= 10;
}
if (originalNum == reversedNum) {
printf("%d is a palindrome.\n", originalNum);
} else {
printf("%d is not a palindrome.\n", originalNum);
}
return 0;
}- A C program that prints the ASCII value of any character.
#include <stdio.h>
int main() {
char ch;
printf("Enter a character: ");
scanf("%c", &ch);
printf("ASCII value of %c: %d\n", ch, ch);
return 0;
}- A C program that calculates the sum of the digits of a given number.
#include <stdio.h>
int main() {
int num, sum = 0, remainder;
printf("Enter a number: ");
scanf("%d", &num);
while (num != 0) {
remainder = num % 10;
sum += remainder;
num /= 10;
}
printf("Sum of digits: %d\n", sum);
return 0;
}- A C program that reverses a given number.
#include <stdio.h>
int main() {
int num, reversedNum = 0, remainder;
printf("Enter a number: ");
scanf("%d", &num);
while (num != 0) {
remainder = num % 10;
reversedNum = reversedNum * 10 + remainder;
num /= 10;
}
printf("Reversed number: %d\n", reversedNum);
return 0;
}- A C program that calculates the average of n numbers.
#include <stdio.h>
int main() {
int n, i, num;
float sum = 0.0, average;
printf("Enter the total numbers: ");
scanf("%d", &n);
printf("Enter the numbers:\n");
for (i = 1; i <= n; i++) {
scanf("%d", &num);
sum += num;
}
average = sum / n;
printf("Average: %.2f\n",average);
return 0;
}- A C program that checks whether a number is an Armstrong number or not.
#include <stdio.h>
int main() {
int num, originalNum, remainder, result = 0;
printf("Enter a three-digit number: ");
scanf("%d", &num);
originalNum = num;
while (originalNum != 0) {
remainder = originalNum % 10;
result += remainder * remainder * remainder;
originalNum /= 10;
}
if (result == num) {
printf("%d is an Armstrong number.\n", num);
} else {
printf("%d is not an Armstrong number.\n", num);
}
return 0;
}- A C program that prints the multiplication table of a given number.
#include <stdio.h>
int main() {
int num, i;
printf("Enter a number: ");
scanf("%d", &num);
printf("Multiplication Table of %d:\n", num);
for (i = 1; i <= 10; i++) {
printf("%d x %d = %d\n", num, i, num * i);
}
return 0;
}- A C program that calculates the power of a number.
#include <stdio.h>
int main() {
int base, exponent;
long long result = 1;
printf("Enter base: ");
scanf("%d", &base);
printf("Enter exponent: ");
scanf("%d", &exponent);
while (exponent != 0) {
result *= base;
--exponent;
}
printf("Result: %lld\n", result);
return 0;
}- A C program that checks whether a character is a vowel or consonant.
#include <stdio.h>
int main() {
char ch;
printf("Enter a character: ");
scanf(" %c", &ch);
if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' ||
ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') {
printf("%c is a vowel.\n", ch);
} else {
printf("%c is a consonant.\n", ch);
}
return 0;
}- A C program that calculates the greatest common divisor (GCD) of two given numbers.
#include <stdio.h>
int main() {
int num1, num2, i, gcd;
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);
for (i = 1; i <= num1 && i <= num2; ++i) {
if (num1 % i == 0 && num2 % i == 0) {
gcd = i;
}
}
printf("GCD of %d and %d: %d\n", num1, num2, gcd);
return 0;
}- A C program that calculates the least common multiple (LCM) of two given numbers.
#include <stdio.h>
int main() {
int num1, num2, max, lcm;
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);
max = (num1 > num2) ? num1 : num2;
while (1) {
if (max % num1 == 0 && max % num2 == 0) {
lcm = max;
break;
}
++max;
}
printf("LCM of %d and %d: %d\n", num1, num2, lcm);
return 0;
}- A C program that calculates the simple interest of an amount.
#include <stdio.h>
int main() {
float principal, rate, time, simpleInterest;
printf("Enter principal amount: ");
scanf("%f", &principal);
printf("Enter rate of interest: ");
scanf("%f", &rate);
printf("Enter time period (in years): ");
scanf("%f", &time);
simpleInterest = (principal * rate * time) / 100;
printf("Simple Interest: %.2f\n", simpleInterest);
return 0;
}These are 20 basic C programs that cover a range of concepts in basic C programming. Feel free to explore and modify them as per your requirements.
