#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("My name is Rahul\n");
    printf("I am in Class 10\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("*\n");
    printf("**\n");
    printf("***\n");
    printf("****\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("================\n");
    printf("|  HELLO C!    |\n");
    printf("================\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("1\n");
    printf("2\n");
    printf("3\n");
    printf("4\n");
    printf("5\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("Name    Age\n");
    printf("----    ---\n");
    printf("Alice   12\n");
    printf("Bob     13\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("My Favorite Cartoon is Shinchan\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("1. Math\n");
    printf("2. Science\n");
    printf("3. English\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("Date: 18-05-2026\n");
    printf("Day: Monday\n");
    return 0;
}


#include <stdio.h>

int main() {
    printf("Number  Square\n");
    printf("1       1\n");
    printf("2       4\n");
    printf("3       9\n");
    printf("4       16\n");
    printf("5       25\n");
    return 0;
}


Learn variables, data types, input and output.

#include <stdio.h>

int main() {
    int age = 15;

    printf("My age is %d\n", age);

    return 0;
}


#include <stdio.h>

int main() {
    char name[50];

    printf("Enter your name: ");
    scanf("%s", name);

    printf("Hello %s!\n", name);

    return 0;
}


#include <stdio.h>

int main() {
    int age;

    printf("How old are you? ");
    scanf("%d", &age);

    printf("You are %d years old.\n", age);

    return 0;
}


#include <stdio.h>

int main() {
    int a, b, sum;

    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);

    sum = a + b;

    printf("Sum = %d\n", sum);

    return 0;
}


#include <stdio.h>

int main() {
    int length, width, area;

    printf("Enter length: ");
    scanf("%d", &length);

    printf("Enter width: ");
    scanf("%d", &width);

    area = length * width;

    printf("Area = %d\n", area);

    return 0;
}


#include <stdio.h>

int main() {
    int p, r, t, si;

    printf("Enter Principal: ");
    scanf("%d", &p);

    printf("Enter Rate: ");
    scanf("%d", &r);

    printf("Enter Time: ");
    scanf("%d", &t);

    si = (p * r * t) / 100;

    printf("Simple Interest = %d\n", si);

    return 0;
}


#include <stdio.h>

int main() {
    float c, f;

    printf("Enter temperature in Celsius: ");
    scanf("%f", &c);

    f = (c * 9 / 5) + 32;

    printf("Fahrenheit = %.2f\n", f);

    return 0;
}


#include <stdio.h>

int main() {
    int a, b, temp;

    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);

    printf("Before Swap: a=%d b=%d\n", a, b);

    temp = a;
    a = b;
    b = temp;

    printf("After Swap: a=%d b=%d\n", a, b);

    return 0;
}


#include <stdio.h>

int main() {
    char ch;

    printf("Enter a character: ");
    scanf(" %c", &ch);

    printf("ASCII Value = %d\n", ch);

    return 0;
}


#include <stdio.h>

int main() {
    int total, minutes, seconds;

    printf("Enter total seconds: ");
    scanf("%d", &total);

    minutes = total / 60;
    seconds = total % 60;

    printf("%d minutes and %d seconds\n", minutes, seconds);

    return 0;
}


#include <stdio.h>

int main() {
    int a, b, c;
    float average;

    printf("Enter 3 numbers: ");
    scanf("%d %d %d", &a, &b, &c);

    average = (a + b + c) / 3.0;

    printf("Average = %.2f\n", average);

    return 0;
}


#include <stdio.h>

int main() {
    int side, perimeter;

    printf("Enter side: ");
    scanf("%d", &side);

    perimeter = 4 * side;

    printf("Perimeter = %d\n", perimeter);

    return 0;
}


Learn conditions, decisions, and operators.

#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;
}


#include <stdio.h>

int main() {
    int a, b;

    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);

    if (a > b) {
        printf("%d is Greater\n", a);
    } else {
        printf("%d is Greater\n", b);
    }

    return 0;
}


#include <stdio.h>

int main() {
    int num;

    printf("Enter a number: ");
    scanf("%d", &num);

    if (num > 0) {
        printf("Positive\n");
    } else if (num < 0) {
        printf("Negative\n");
    } else {
        printf("Zero\n");
    }

    return 0;
}


#include <stdio.h>

int main() {
    int marks;

    printf("Enter marks: ");
    scanf("%d", &marks);

    if (marks >= 90) {
        printf("Grade A+\n");
    } else if (marks >= 80) {
        printf("Grade A\n");
    } else if (marks >= 70) {
        printf("Grade B\n");
    } else if (marks >= 60) {
        printf("Grade C\n");
    } else {
        printf("Grade F\n");
    }

    return 0;
}


#include <stdio.h>

int main() {
    int a, b, c;

    printf("Enter three numbers: ");
    scanf("%d %d %d", &a, &b, &c);

    if (a > b && a > c) {
        printf("%d is Largest\n", a);
    } else if (b > c) {
        printf("%d is Largest\n", b);
    } else {
        printf("%d is Largest\n", c);
    }

    return 0;
}


#include <stdio.h>

int main() {
    int age;

    printf("Enter your age: ");
    scanf("%d", &age);

    if (age >= 18) {
        printf("Eligible to vote\n");
    } else {
        printf("Not eligible to vote\n");
    }

    return 0;
}


#include <stdio.h>

int main() {
    int year;

    printf("Enter year: ");
    scanf("%d", &year);

    if (year % 4 == 0) {
        printf("Leap Year\n");
    } else {
        printf("Not a Leap Year\n");
    }

    return 0;
}


#include <stdio.h>

int main() {
    int a, b, choice;

    printf("1. Add\n");
    printf("2. Subtract\n");
    printf("3. Multiply\n");
    printf("4. Divide\n");

    printf("Enter choice: ");
    scanf("%d", &choice);

    printf("Enter two numbers: ");
    scanf("%d %d", &a, &b);

    switch(choice) {

        case 1:
            printf("Result = %d\n", a + b);
            break;

        case 2:
            printf("Result = %d\n", a - b);
            break;

        case 3:
            printf("Result = %d\n", a * b);
            break;

        case 4:
            if (b != 0)
                printf("Result = %d\n", a / b);
            else
                printf("Cannot divide by zero\n");
            break;

        default:
            printf("Wrong Choice\n");
    }

    return 0;
}
