//wap to display the fibonacci series up to nth term.
#include <stdio.h>

int main() {
    int n, i, a = 0, b = 1, c;
    printf("enter num upto which u want the series to continue: ");
    scanf("%d", &n);
    printf("fibonacci Series up to %d terms is: \n", n);
    printf("%d %d ", a, b); 
    for (i = 3; i <= n; i++) {
        c = a + b;
        printf("%d ", c);
        a = b;
        b = c;
    }
    return 0;
}
//QN5. 
#include<stdio.h>
#include<math.h>
int main(){
    int cost, sum,unit,charge;
    printf("enter unit of electricity");
    scanf("%d",&unit);
    if(unit>=0&&unit<=20){
        charge=unit*4;
        cost=charge+50;
    }
    else if(unit>=21&&unit<=30){
        charge=unit*7;
        cost=charge+75;
    }
    else if(unit>=31&&unit<=50){
        charge=unit*8.5;
        cost=charge+100;
    }
    else if(unit>=51&&unit<=150){
        charge=unit*10;
        cost=charge+125;
    }
    else if(unit>=151){
        charge=unit*11;
        cost=charge+150;
    }
    else{
        printf("Invalid Unit");
    }
    printf("Your total cost is %d",cost);
}
//QN6. wap to find all roots of quadratic equation 
#include<stdio.h>
#include<math.h>
int main() {
    int a, b, c, root;
    printf("Enter the value of a,b,c after comparing with the quadratic equation (ax^2 + bx + c): ");
    scanf("%d%d%d", &a, &b, &c);
    int disc = pow(b, 2) - 4 * a * c;
    if (disc > 0) {
        root = (-b + sqrt(disc)) / (2 * a);
        printf("The roots are %d and %d\n", root, root);
    } 
    else if (disc < 0) {
        root = -b / (2 * a);
        printf("The roots are %di and %di\n", root, root);
    } 
    else {
        root = -b / (2 * a);
        printf("The root is %d\n", root);
    }
    return 0;
}
//QN7.
#include<stdio.h>
#include<math.h>
int main() {
    int purchaseamt,cost,discount;
    printf("enter purchase amount");
    scanf("%d",&purchaseamt);
    if(purchaseamt>=10000){
        cost=purchaseamt-(0.2*purchaseamt);
    }
    if(purchaseamt>=5000&&purchaseamt<10000){
        cost=purchaseamt-(0.1*purchaseamt);
    }
    if(purchaseamt<5000){
        cost=purchaseamt-(0.03*purchaseamt);
    }
    printf("Your cost after discount is %d",cost);
    return 0;
}
//QN10. WAP to display all those palindrome numbers from 1 to 100 and count the displayed numbers.
#include<stdio.h>
int main() {
    int num, rem, reverse_num, temp, start, end, count = 0;
    printf("Enter the lower limit: ");
    scanf("%d", &start);
    printf("Enter the upper limit: ");
    scanf("%d", &end);
    printf("Palindrome numbers between %d and %d are: ", start, end);
    for (num = start; num <= end; num++) {
        temp = num;
        reverse_num = 0;
        while (temp) {
            rem = temp % 10;
            temp = temp / 10;
            reverse_num = reverse_num * 10 + rem;
        }
        if (num == reverse_num) {
            printf("%d ", num);
            count++; 
        }
    }
    printf("\nTotal palindrome numbers found: %d", count); 
    return 0;
}
//QN11.wap to check leap year.
#include <stdio.h>
int main() {
   int year;
   printf("Enter a year: ");
   scanf("%d", &year);
   if (year % 400 == 0) {
      printf("%d is a leap year.", year);
   }
   else if (year % 100 == 0) {
      printf("%d is not a leap year.", year);
   }
   else if (year % 4 == 0) {
      printf("%d is a leap year.", year);
   }
   else {
      printf("%d is not a leap year.", year);
   }
   return 0;
}
//QN12.write a menu driven program having following menu:
//a. multiplication table
//b.positive or negative number
//c.exit
//Note: Repeat the program till user wants.
#include<stdio.h>
int main() {
    int num, i, choice;
    do {
        printf("\nMenu:\n");
        printf("1. Multiplication table\n");
        printf("2. Check positive or negative number\n");
        printf("3. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1: {
                printf("Enter a number to find its multiplication table: ");
                scanf("%d", &num);
                for (i = 1; i <= 10; i++) {
                    printf("%d x %d = %d\n", num, i, num * i);
                }
                break;
            }
            case 2: {
                printf("Enter a number to check if it's positive or negative: ");
                scanf("%d", &num);
                if (num < 0) {
                    printf("It's negative.\n");
                } else if (num > 0) {
                    printf("It's positive.\n");
                } else {
                    printf("It's zero.\n");
                }
                break;
            }
            case 3: {
                printf("Exiting the program.\n");
                break;
            }
            default: {
                printf("Invalid choice! Please enter a valid option.\n");
            }
        }
    } while (choice != 3);

    return 0;
}