Q-1: Mr. Aggarwal is an employee of a Private Firm. His Basic salary is Rs. 5500/-(suppose) . Now the dearness allowance is 74% of his basic salary and house rent allowance is 15% of basic salary. Write a program to calculate his gross salary.

#include<stdio.h>

#include<conio.h>

void main()

{

                float gs,da,bs,hr;

                clrscr();

                                printf("\n\t\tENTER THE BASIC SALARY OF AN EMPLOYEE:");

                                scanf("%f",&bs);

                                da=(bs*74)/100;

                                hr=(bs*15)/100;

                                gs=bs+hr+da;

                                printf("\n\t\tTHE GROSS SALARY:%f",gs);

                getch();

}

Q-2: The length and breadth of a rectangle and radius of a circle are input through key board. Write a program to calculate the area and perimeter of the rectangle and the area and the circumference of the circle.

#include<stdio.h>

#include<conio.h>

void main()

{

                float len,bre,aor,aoc,por,coc,rad;

                clrscr();

                                printf("\n\t\tENTER THE LENGTH OF THE RECTANLE:");

                                scanf("%f",&len);

                                printf("\n\t\tENTER THE BREADTH OF THE RECTANLE:");

                                scanf("%f",&bre);

                                printf("\n\t\tENTER THE RADIUS OF THE CIRCLE:");

                                scanf("%f",&rad);

                                                aor=len*bre;

                                                por=2*(len+bre);

                                                aoc=3.14*rad*rad;

                                                coc=3.14*2*rad;

                                printf("\n\t\tTHE AREA OF RECTANGLE:%f",aor);

                                printf("\n\n\t\tTHE PERIMETER OF RECTANGLE:%f",por);

                                printf("\n\n\t\tTHE AREA OF CIRCLE:%f",aoc);

                                printf("\n\n\t\tTHE CIRCUMFERENCE OF CIRCLE:%f",coc);

                getch();

}

Q-3: Temperatures of a city in Fahrenheit degree are input through a keyboard. Write a prgram to convert the temperature into centigrade degrees.

#include<stdio.h>

#include<conio.h>

void main()

{

                float c,f;

                clrscr();

                                printf("\n\t\tENTER THE TEMPRATURE IN FARENHEIT:");

                                scanf("%f",&f);

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

                                printf("\n\t\tTHE TEMPRATURE IS IN CELSIUS:%f",c);

                getch();

}

Q-4-a: Write a program to swap two numbers by using third variables.

#include<stdio.h>

#include<conio.h>

void main()

{

                int a,b,temp;

                clrscr();

                printf("\n\t\tENTER ANY NUMBER FOR a:");

                scanf("%d",&a);

                printf("\n\t\tENTER ANY NUMBER FOR b:");

                scanf("%d",&b);

                                temp=a;

                                a=b;

                                b=temp;

                printf("\n\t\tTHE SWAPPING OF a=%d AND b=%d",a,b);

                getch();

}

Q-4-a: Write a program to swap two numbers without using third variables.

#include<stdio.h>

#include<conio.h>

void main()

{

                int a,b;

                clrscr();

                printf("\n\t\tENTER ANY NUMBER FOR a:");

                scanf("%d",&a);

                printf("\n\t\tENTER ANY NUMBER FOR b:");

                scanf("%d",&b);

                                a=a+b;

                                b=a-b;

                                a=a-b;

                printf("\n\t\tTHE SWAPPING OF a=%d AND b=%d",a,b);

                getch();

}

Q-5: Write a program to find area of a triangle: Area of triangle = sqrt[s(s-a)(s-b)(s-c)] where a,b, and c are three sides of the triangle and s=a+b+c/2.

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

                double s,a,b,c,aot;

                clrscr();

                printf("### Area Of Triangle ###\n");

                printf("\nENTER THE VALUE FOR a:");

                scanf("%lf",&a);

                printf("\nENTER THE VALUE FOR b:");

                scanf("%lf",&b);

                printf("\nENTER THE VALUE FOR c:");

                scanf("%lf",&c);

                                s=(a+b+c)/2;

                printf("\nS=%lf",s);

                                aot=sqrt(s*(s-a)*(s-b)*(s-c));

                printf("\nAREA OF TRIANGLE:%lf",aot);

                getch();

}

Q-6: Write a program to calculate and print electricity bill for consumers, given the following information: service number, previous meter reading, and current reading.

#include<stdio.h>

#include<conio.h>

void main()

{

                int pre,c,sn;

                float bill_amt,pre_amt,unit;

                clrscr();

                printf("\t\tWelcome To Kolkata Electricity Board\n");

                printf("\n\n ENTER SERVICE NUMBER:");

                scanf("%d",sn);

                printf("\nENTER THE PREVIOUS MONTH READING UNIT USED:");

                scanf("%d",&pre);

                printf("\nENTER THE CURRENT MONTH READING UNIT USED:");

                scanf("%d",&c);

                                pre_amt=pre*2.5;

                                bill_amt=c*2.5;

                printf("\nCustomer With SERVICE NUMBER:%d",sn);

                printf("\n\t\tCustomer's Previous Bill Amount:%f",pre_amt);

                printf("\n\t\tCustomer's Current Bill Amount:%f",bill_amt);

                getch();

}