Calculate the Area of a Triangle

#include

void main()

{

int s, a, b, c, area;

clrscr();

printf("Enter the values of a, b and c \n");

scanf("%d %d %d", &a, &b, &c);

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

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

printf("Area of a triangle = %d \n", area);

getch();

}

Output

Enter the values of a, b and c

12 10 8

Area of a triangle = 39

Calculate the Area of a Circle

#include

#include

#include

#define PI 3.142

void main()

    float radius, area;

    clrscr();

    printf("Enter the radius of a circle \n");

    scanf("%f", &radius);

    area = PI * pow(radius, 2);

    printf("Area of a circle = %5.2f\n", area);

    getch();

Output

Enter the radius of a circle

Area of a circle = 2827.80

Calculate the Simple Interest

#include

#include

void main()

    float principal_amt, rate, simple_interest;

    int time;

    clrscr();

    printf("Enter the values of principal_amt, rate and time \n");

    scanf("%f %f %d", &principal_amt, &rate, &time);

    simple_interest = (principal_amt * rate * time) / 100.0;

    printf("Amount = Rs. %5.2f\n", principal_amt);

    printf("Rate = Rs. %5.2f%\n", rate);

    printf("Time = %d years\n", time);

    printf("Simple interest = %5.2f\n", simple_interest);

    getch();

Output

Enter the values of principal_amt, rate and time

Amount = Rs. 12.00

Rate = Rs. 10.00%

Time = 5 years

Simple interest =  6.00

#include

#include

#include

#include

void main()

    float a, b, c, root1, root2;

    float realp, imagp, disc;

    clrscr();

    printf("Enter the values of a, b and c \n");

    scanf("%f %f %f", &a, &b, &c);

    if (a == 0 || b == 0 || c == 0)

        printf("Error: Roots cannot be determined \n");

        exit(1);

    else

        disc = b * b - 4.0 * a * c;

        if (disc < 0)

            printf("Imaginary Roots\n");

            realp = -b / (2.0 * a) ;

            imagp = sqrt(abs(disc)) / (2.0 * a);

            printf("Root1 = %f  +i %f\n", realp, imagp);

            printf("Root2 = %f  -i %f\n", realp, imagp);

        else if (disc == 0)

            printf("Roots are real and equal\n");

            root1 = -b / (2.0 * a);

            root2 = root1;

            printf("Root1 = %f\n", root1);

            printf("Root2 = %f\n", root2);

        else if (disc > 0 )

            printf("Roots are real and distinct \n");

            root1 =(-b + sqrt(disc)) / (2.0 * a);

            root2 =(-b - sqrt(disc)) / (2.0 * a);

            printf("Root1 = %f  \n", root1);

            printf("Root2 = %f  \n", root2);

    getch();

Output

Enter the values of a, b and c

45 50 65

Imaginary Roots

Root1 = -0.555556  +i 1.065740

Root2 = -0.555556  -i 1.065740

#include

#include

void main()

    char operator;

    float num1, num2, result;

    clrscr();

    printf("Simulation of a Simple Calculator\n");

    printf("*********************************\n");

    printf("Enter two numbers \n");

    scanf("%f %f", &num1, &num2);

    fflush(stdin);

    printf("Enter the operator [+,-,*,/] \n");

    scanf("%s", &operator);

    switch(operator)

    case '+': result = num1 + num2;

        break;

    case '-': result = num1 - num2;

        break;

    case '*': result = num1 * num2;

        break;

    case '/': result = num1 / num2;

        break;

    default : printf("Error in operationn");

        break;

    printf("\n %5.2f %c %5.2f = %5.2f\n", num1, operator, num2, result);

getch();

Output

Simulation of a Simple Calculator

*********************************

Enter two numbers

2 3

Enter the operator [+,-,*,/]

2.00 +  3.00 =  5.00

Simulation of a Simple Calculator

*********************************

Enter two numbers

50 40

Enter the operator [+,-,*,/]

50.00 * 40.00 = 2000.00

Simulation of a Simple Calculator

*********************************

Enter two numbers

500 17

Enter the operator [+,-,*,/]

500.00 / 17.00 = 29.41

Simulation of a Simple Calculator

*********************************

Enter two numbers

65000 4700

Enter the operator [+,-,*,/]

65000.00 - 4700.00 = 60300.00

#include

#include

void main()

    int i, num, sum = 0;

    clrscr();

    printf("Enter an integer number \n");

    scanf ("%d", &num);

    for (i = 1; i <= num; i++)

        sum = sum + i;

    printf ("Sum of first %d natural numbers = %d\n", num, sum);

    getch();

Output

Enter an integer number

Sum of first 1300 natural numbers = 845650

Enter an integer number

Sum of first 15 natural numbers = 120

#include

#include

void main()

    int fib1 = 0, fib2 = 1, fib3, num, count = 0;

    clrscr();

    printf("Enter the value of num \n");

    scanf("%d", &num);

    printf("First %d FIBONACCI numbers are ...\n", num);

    printf("%d\n", fib1);

    printf("%d\n", fib2);

    count = 2; /* fib1 and fib2 are already used */

    while (count < num)

        fib3 = fib1 + fib2;

        count++;

        printf("%d\n", fib3);

        fib1 = fib2;

        fib2 = fib3;

   getch();

Output

Enter the value of num

First 15 FIBONACCI numbers are ...