Programming In C (4331105) - Winter 2022 Solution

#include <stdio.h>

int main() {
    int num1, num2, max;
    
    printf("Enter two numbers: ");
    scanf("%d %d", &num1, &num2);
    
    max = (num1 > num2) ? num1 : num2;
    
    printf("Maximum number is: %d", max);
    
    return 0;
}

#include <stdio.h>
#include <math.h>

int main() {
    float a, b, c;
    float discriminant, root1, root2;
    
    printf("Enter coefficients a, b, c: ");
    scanf("%f %f %f", &a, &b, &c);
    
    discriminant = b*b - 4*a*c;
    
    if (discriminant > 0) {
        root1 = (-b + sqrt(discriminant)) / (2*a);
        root2 = (-b - sqrt(discriminant)) / (2*a);
        printf("Roots: %.2f and %.2f", root1, root2);
    } else if (discriminant == 0) {
        root1 = -b / (2*a);
        printf("Root: %.2f", root1);
    } else {
        printf("No real roots");
    }
    
    return 0;
}

#include <stdio.h>

int main() {
    int i = 0;
    
start:
    printf("%d ", i);
    i++;
    if (i < 5)
        goto start;
    
    return 0;
}
// Output: 0 1 2 3 4

#include <stdio.h>

int main() {
    int num;
    
    printf("Enter a number: ");
    scanf("%d", &num);
    
    if (num % 2 == 0)
        printf("%d is even", num);
    else
        printf("%d is odd", num);
        
    return 0;
}

#include <stdio.h>

int main() {
    int marks;
    char grade;
    
    printf("Enter marks: ");
    scanf("%d", &marks);
    
    if (marks >= 90)
        grade = 'A';
    else if (marks >= 80)
        grade = 'B';
    else if (marks >= 70)
        grade = 'C';
    else if (marks >= 60)
        grade = 'D';
    else
        grade = 'F';
        
    printf("Grade: %c", grade);
    
    return 0;
}

// break example
for(int i=1; i<=10; i++) {
    if(i == 6)
        break;      // Exits loop when i=6
    printf("%d ", i); // Output: 1 2 3 4 5
}

// continue example
for(int i=1; i<=10; i++) {
    if(i % 2 == 0)
        continue;   // Skips even numbers
    printf("%d ", i); // Output: 1 3 5 7 9
}

#include <stdio.h>

int main() {
    int i, sum = 0;
    
    for(i = 1; i <= 10; i++) {
        sum += i;
    }
    
    printf("Sum of numbers from 1 to 10: %d", sum);
    
    return 0;
}

#include <stdio.h>

int main() {
    int choice;
    
    printf("Enter operation (1-4): ");
    scanf("%d", &choice);
    
    switch(choice) {
        case 1:
            printf("Addition selected");
            break;
        case 2:
            printf("Subtraction selected");
            break;
        case 3:
            printf("Multiplication selected");
            break;
        case 4:
            printf("Division selected");
            break;
        default:
            printf("Invalid choice");
    }
    
    return 0;
}

#include <stdio.h>

int main() {
    char upper, lower;
    
    printf("Enter uppercase letter: ");
    scanf("%c", &upper);
    
    lower = upper + 32;
    // Alternatively: lower = tolower(upper);
    
    printf("Lowercase letter: %c", lower);
    
    return 0;
}

#include <stdio.h>

int main() {
    int num = 10;
    int *ptr;
    
    ptr = &num;  // Store address of num in ptr
    
    printf("Value of num: %d\n", num);
    printf("Address of num: %p\n", &num);
    printf("Value of ptr: %p\n", ptr);
    printf("Value pointed by ptr: %d\n", *ptr);
    
    *ptr = 20;  // Change value using pointer
    printf("New value of num: %d\n", num);
    
    return 0;
}

#include <stdio.h>

int main() {
    int i;
    
    // Syntax: for(initialization; condition; update)
    for(i = 1; i <= 5; i++) {
        printf("%d ", i);
    }
    // Output: 1 2 3 4 5
    
    return 0;
}

#include <stdio.h>

int main() {
    float base, height, area;
    
    printf("Enter base of triangle: ");
    scanf("%f", &base);
    
    printf("Enter height of triangle: ");
    scanf("%f", &height);
    
    area = 0.5 * base * height;
    
    printf("Area of triangle: %.2f", area);
    
    return 0;
}

#include <stdio.h>

int main() {
    int num = 10;           // Regular variable
    int *ptr1;              // Declaration only
    int *ptr2 = &num;       // Declaration with initialization
    
    ptr1 = &num;            // Initialization of ptr1
    
    printf("num value: %d\n", num);
    printf("num address: %p\n", &num);
    printf("ptr1 value: %p\n", ptr1);
    printf("ptr2 value: %p\n", ptr2);
    printf("Value via ptr1: %d\n", *ptr1);
    printf("Value via ptr2: %d\n", *ptr2);
    
    return 0;
}

#include <stdio.h>

int main() {
    int i = 1;
    
    // Syntax: while(condition) { body }
    while(i <= 5) {
        printf("%d ", i);
        i++;
    }
    // Output: 1 2 3 4 5
    
    return 0;
}

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

struct Book {
    int book_no;
    char book_title[50];
    char book_author[50];
    float book_price;
};

int main() {
    struct Book book1;
    
    book1.book_no = 101;
    strcpy(book1.book_title, "Programming in C");
    strcpy(book1.book_author, "Dennis Ritchie");
    book1.book_price = 450.50;
    
    printf("Book No: %d\n", book1.book_no);
    printf("Title: %s\n", book1.book_title);
    printf("Author: %s\n", book1.book_author);
    printf("Price: %.2f", book1.book_price);
    
    return 0;
}

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

int main() {
    double sqrtResult = sqrt(25);
    double powResult = pow(2, 4);
    char str[] = "Programming";
    char dest[20];
    int length = strlen(str);
    
    strcpy(dest, str);
    
    printf("sqrt(25) = %.2f\n", sqrtResult);
    printf("pow(2, 4) = %.2f\n", powResult);
    printf("Length of '%s' = %d\n", str, length);
    printf("Copied string: %s\n", dest);
    
    return 0;
}

#include <stdio.h>

int main() {
    // Array declaration and initialization
    int numbers[5] = {10, 20, 30, 40, 50};
    
    // Accessing array elements
    printf("First element: %d\n", numbers[0]);
    printf("Third element: %d\n", numbers[2]);
    
    // Changing array element
    numbers[1] = 25;
    
    // Printing all elements
    printf("Array elements: ");
    for(int i = 0; i < 5; i++) {
        printf("%d ", numbers[i]);
    }
    
    return 0;
}

#include <stdio.h>

// Function declaration
int sum(int a, int b);

int main() {
    int num1 = 5, num2 = 10;
    int result;
    
    // Function call
    result = sum(num1, num2);
    
    printf("Sum = %d", result);
    
    return 0;
}

// Function definition
int sum(int a, int b) {
    return a + b;
}

#include <stdio.h>

int main() {
    int arr[100], n, i;
    int sum = 0;
    float avg;
    
    printf("Enter number of elements: ");
    scanf("%d", &n);
    
    printf("Enter %d elements:\n", n);
    for(i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
        sum += arr[i];  // Add each element to sum
    }
    
    avg = (float)sum / n;  // Calculate average
    
    printf("Sum of array elements: %d\n", sum);
    printf("Average of array elements: %.2f", avg);
    
    return 0;
}