Task 1.1: Repeated ASCII Art Output

A while loop prints a simple stick-figure pattern twice:

#include <stdio.h>
int main() {
    int counter = 0;
    while (counter < 2) {
        printf(" O \n");
        printf("<H>\n");
        printf("I I\n");
        ++counter;
    }
    return 0;
}

Task 1.2: Side-by-Side Pattern Rendering

This version displays two identical figures aligned horizontally:

#include <stdio.h>
int main() {
    printf(" O      O \n");
    printf("<H>    <H>\n");
    printf("I I    I I\n");
    return 0;
}

Task 2: Triangle Validitty Checker

Validates whether three real numbers can form a triangle using the triangle inequality theorem:

#include <stdio.h>
int main() {
    double side_a, side_b, side_c;
    scanf("%lf %lf %lf", &side_a, &side_b, &side_c);
    if (side_a + side_b > side_c && 
        side_b + side_c > side_a && 
        side_a + side_c > side_b) {
        printf("Valid triangle\n");
    } else {
        printf("Invalid triangle\n");
    }
    return 0;
}

Task 3: Interactive Habit Assessment

Reads two single-character responses and evaluates consistency in affirmative input (y or Y). The extra getchar() consumes the newline left by the first input to prevent skipping the second prompt:

#include <stdio.h>
int main() {
    char response1, response2;
    printf("Did you review before class and after? (y/Y or n/N): ");
    response1 = getchar();
    getchar(); // Discard newline
    printf("\nDid you practice coding? (y/Y or n/N): ");
    response2 = getchar();
    if ((response1 == 'y' || response1 == 'Y') && 
        (response2 == 'y' || response2 == 'Y')) {
        printf("\nConsistency pays off — keep going!\n");
    } else {
        printf("\nLet’s build better habits together.\n");
    }
    return 0;
}

Task 4: Mixed-Type Input Parsing

Demonstrates sequential reading of integers, characters, and floating-point values, with leading whitespace handling in format strings:

#include <stdio.h>
int main() {
    int val1, val2, val3;
    char ch1, ch2, ch3;
    double num1, num2;
    scanf("%d %d %d", &val1, &val2, &val3);
    printf("val1 = %d, val2 = %d, val3 = %d\n", val1, val2, val3);
    scanf(" %c %c %c", &ch1, &ch2, &ch3);
    printf("ch1 = %c, ch2 = %c, ch3 = %c\n", ch1, ch2, ch3);
    scanf(" %lf %lf", &num1, &num2);
    printf("num1 = %.2f, num2 = %.2f\n", num1, num2);
    return 0;
}

Task 5: Time Unit Conversion

Computes approximate years in one billion seconds using integer division:

#include <stdio.h>
int main() {
    const int SECONDS_PER_YEAR = 31536000;
    int years = 1000000000 / SECONDS_PER_YEAR;
    printf("One billion seconds ≈ %d years\n", years);
    return 0;
}

Task 6.1: Exponential Growth Simulation

Repeatedly reads a base value and computes its 365th power. Note: This may overflow for |x| > 1.

#include <stdio.h>
#include <math.h>
int main() {
    double base;
    while (scanf("%lf", &base) == 1) {
        double result = pow(base, 365);
        printf("%.2f^365 = %.2f\n", base, result);
    }
    return 0;
}

Task 7: Celsius-to-Fahrenheit Converter

Processes multiple temperature inputs until end-of-file:

#include <stdio.h>
int main() {
    double celsius;
    while (scanf("%lf", &celsius) != EOF) {
        double fahrenheit = 1.8 * celsius + 32.0;
        printf("Celsius = %.2f → Fahrenheit = %.2f\n", celsius, fahrenheit);
    }
    return 0;
}

Task 8: Triangle Area Calculator Using Heron’s Formula

Computes area from side lengths for multiple test cases:

#include <stdio.h>
#include <math.h>
int main() {
    double a, b, c;
    while (scanf("%lf %lf %lf", &a, &b, &c) == 3) {
        double semi = (a + b + c) / 2.0;
        double area = sqrt(semi * (semi - a) * (semi - b) * (semi - c));
        printf("a=%.3f, b=%.3f, c=%.3f → area=%.3f\n", a, b, c, area);
    }
    return 0;
}