Interactive Exercises 2

 As continuous lets do some more exercises

1 . Write a program that converts inches to centimeters. For example, if the user enters 16.9
for a Length in inches, the output would be 42.926cm. (Hint: 1 inch = 2.54 centimeters.)

ANSWER

#include<stdio.h>

int main()

{

float inch, centimeter;

/* inpur from user */

printf ("Enter the inch value : ");

scanf("%f", &inch);

/* converting inch to centimeter*/

centimeter = inch * 2.54;

/* display the value in centimeter */

printf("the given value %f inch converted to %f cm", inch, centimeter);

return 0;

}

2. Write a program to evaluate the polynomial shown here:

3x3 - 5x2 + 6 for x = 2.55

ANSWER

#include<stdio.h>

int main()

{

double x = 2.55;

double result;

result = (3 * x * x * x) - ( 5 * x * x)  + 6;

printf("Answer for the polynomial equation is : %f", result); 

return 0;

} 

3. Write a program that evaluates the following expression and displays the results
(remember to use exponential format to display the result):
(3.31 × 10-8 × 2.01 × 10-7) / (7.16 × 10-6 + 2.01 × 10-8)

ANSWER 

#include<stdio.h>

int main()

{

/* (3.31 × 10-8 × 2.01 × 10-7) / (7.16 × 10-6 + 2.01 × 10-8)*/

float result;

result = (3.31e-8 * 2.01e-7) / (7.16e-6 + 2.01e-8);

printf("Value of the expression is : %e", result);

return 0;

}

4. Write a program to input your mid term marks of a subject marked out of 30 and the final exam marks out of 100. Calculate and print the final results.
Final Result = Mid Term + 70% of Final Mark

ANSWER

#include <stdio.h>

int main() {

    int midtermmarks, finalmarks;

    float finalresult;

    /* Input midterm marks */

    printf("Enter midterm marks (out of 30): ");

    scanf("%d", &midtermmarks);

    /* Input final exam marks */

    printf("Enter final exam marks (out of 100): ");

    scanf("%d", &finalmarks);

    /* Calculate final result */

if (midtermmarks <= 30 && finalmarks <= 100)

{

    finalresult = midtermmarks + 0.7 * finalmarks;

}

    /* Print final result*/

    printf("Final result: %.2f\n", finalresult);

    return 0;

}

5. Swap two values stored in two different variables.

#include<stdio.h>

int main()

{

int a = 10, b = 5, c;

c = a;   /* assigning a for c */

a = b;   /* assigning b for a */

b = c;    /* assigning c for b */

printf("Value of a is %d and b is %d", a, b);

return 0;

}

6. Check whether an entered number is negative, positive or zero.

#include<stdio.h>

int main()

{

int num;

printf("enter the number : ");

scanf("%d", &num);

if ( num == 0 )

printf("Entered number is zero");

else if (num < 0)

printf("Entered number is a negative number");

else 

printf ("entered number is a positive number");

return 0;

}