Simple Programs Using Operators

Program to find area of circle.
Hint: Area = PI * r * r
#include<stdio.h>
#include<conio.h>
void main()
{ 
         float r,a; 
         clrscr(); 
         printf("Enter Radius of Circle:");
         scanf("%f",&r);
         a=3.14*r*r;
         printf("Area of Circle is %f",a);
         getch();
}
Output
Enter Radius of Circle:
3
Area of Circle is 28.260000
Program to find area of cylinder.
Hint: Area = 2 * PI * r * h
#include<stdio.h>
#include<conio.h>
void main()
{
        float r,h,a;
        clrscr();
        printf("Enter Radius:");
        scanf("%f",&r);
        printf("Enter Height:");
        scanf("%f",&h);
        a= 2* 3.14 * r * h;
        printf("Area of Cylinder is %f",a);
        getch();
}
Output
Enter Radius
2
Enter Height:
5
Area of Cylinder is 62.800000
     
Program to find area of Triangle.
Hint: Area = (0.5) * b * h
#include<stdio.h>
#include<conio.h>
void main()
{
    float b,h,a;
    clrscr();
    printf("Enter Base:");
    scanf("%f",&b);
    printf("Enter Height:");
    scanf("%f",&h);
    a= (0.5) * b * h;
    printf("Area of Trinagle is %f",a);
    getch();
}
Output
Enter Base
10
Enter Height
5
Area of Triangle is 25
Program to find area of Rectangle.
Hint: Area = w * h
#include<stdio.h>
#include<conio.h>
void main()
{
    float w,h,a;
    clrscr();
    printf("Enter Width:");
    scanf("%f",&w);
    printf("Enter Height:");
    scanf("%f",&h);
    a= w * h;
    printf("Area of Rectangle is %f",a);
    getch();
}
Output
Enter Width:
5
Enter Height:
6
Area of Rectangle is 30.000000
Program to enter temprature in celcius and convert it into feranhit.
#include<stdio.h>
#include<conio.h>
void main()
{
    float f,c;
    clrscr();
    printf("Enter temperature in celcius:");
    scanf("%f",&c);
    f=1.8*(c+32);
    printf("Feranhit=%f",f);
    getch();
}
Output
Enter Temperature in Celcius:
23
Feranhit= 99
Program to enter temprature in feranhit and convert it into celcius.
#include<stdio.h>
#include<conio.h>
void main()
{
    float f,c;
    clrscr();
    printf("Enter temperature in feranhit:");
    scanf("%f",&f);
    c=0.56*(f-32);
    printf("Celcius=%f",c);
    getch();
}
Output
Enter Temperature in Feranhit
99
Celcius=37.520000
program to swap (exchange) value of two numbers using third variable. Hint: c=a, a=b, b=c
#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b,c;
    clrscr();
    printf("Enter Value of A:");
    scanf("%d",&a);
    printf("Enter Value of B:");
    scanf("%f",&b);
    printf("Before Swap:\n");
    printf("A=%d\nB=%d\n",a,b);
    c=a;
    a=b;
    b=c;
    printf("After Swap:\n");
    printf("A=%d\nB=%d\n",a,b);
    getch();
}
Output
Enter Value of A:2
Enter Value of B:3
Before Swap:
A=2 B=3
After Swap
A=3 B=2
program to swap (exchange) value of two numbers without using third variable. Hint: a=a+b, b=a-b, a=a-b
#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b,c;
    clrscr();
    printf("Enter Value of A:");
    scanf("%d",&a);
    printf("Enter Value of B:");
    scanf("%f",&b);
    printf("Before Swap:\n");
    printf("A=%d\nB=%d\n",a,b);
    a=a+b;
    b=a-b;
    a=a-b;
    printf("After Swap:\n");
    printf("A=%d\nB=%d\n",a,b);
    getch();
}
Output
Enter Value of A:2
Enter Value of B:3
Before Swap:
A=2 B=3
After Swap
A=3 B=2
Program to Enter days and convert them into year,month and days.
#include<stdio.h>
#include<conio.h>
void main()
{
    int day,month,year;
    clrscr();
    printf("Enter Total Days:");
    scanf("%d",&day);
    year=day/365;
    day=day%365;
    month=day/30;
    day=day%30;
    printf("Year=%d\nMonth=%d\nDay=%d",year,month,day);
    getch();
}
Output
Enter Total Days
402
Year=1
Month=1
Day=7
Program to find maximum from two numbers using conditional operator.
#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b;
    clrscr();
    printf("Enter Value of a:");
    scanf("%d",&a);
    printf("Enter Value of b:");
    scanf("%d",&b);
    (a>b)?printf("%d is maximum",a):printf("%d is maximum",b);
    getch(); 
}
Output
Enter Value of a: 30
Enter Value of B: 25
30 is maximum
Program to find maximum from three numbers using conditional operator.
#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b,c;
    clrscr();
    printf("Enter Value of a:");
    scanf("%d",&a);
    printf("Enter Value of b:");
    scanf("%d",&b);
    printf("Enter Value of c:");
scanf("%d",&c); ((a>b) && (a>c))?printf("%d is maximum",a):((b>c)&&(b>a))?printf("%d is maximum",b):printf("%d is maximum",c);
    getch();
}
Output
Enter Value of A:21
Enter Value of B:32
Enter Value of C:45
45 is maximum

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