C - Part 57

Calculate Sum of Digits: C Program

Lets ask the user to input a integer number through keyboard. Lets write a c program to calculate sum of its digits.

Related Read:
Find Sum of Digits In A Given Number: C

Note: We assign variable sum = 0 to avoid garbage values in sum.

If user enters 456, we apply the modulo division to get the individual values.
Ex:
456 % 10 = 6
45 % 10 = 5
4 % 10 = 4

We get 456, 45 and 4 by dividing the original value by 10.
Ex:
456 user entered value.
456 / 10 = 45
45 / 10 = 4

Now the sum.

sum = sum + rem;

06 = 0 + 6
11 = 6 + 5
15 = 11 + 4

So the sum of digits in the given integer number is 15.

Calculate Sum of Digits: C Program

[youtube https://www.youtube.com/watch?v=CdHLY5S2Xdc]

YouTube Link: https://www.youtube.com/watch?v=CdHLY5S2Xdc [Watch the Video In Full Screen.]

Source Code: Calculate Sum of Digits: C Program

#include < stdio.h >

int main()
{
    int num, reminder, sum = 0;

    printf("Enter a integer number\n");
    scanf("%d", &num);

    while(num != 0)
    {
     reminder = num % 10;
     sum      = sum + reminder;
     num      = num / 10;
    }

    printf("Sum of digit is %d\n", sum);

    return 0;
}

Output 1:
Enter a integer number
456
Sum of digit is 15

Output 2:
Enter a integer number
8910
Sum of digit is 18

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Convert Kilometer To Meter, Centimeter, Millimeter: C Program

The distance between two cities (in Kilometer) is input through the keyboard. Write a program to convert and print this distance in meters, centimeter, millimeter.

Note:
1 Kilometer(km) = 1000 Meters(m).
1 Kilometer(km) = 100000 Centimeters(cm).
1 Kilometer(km) = 1000000 Millimeters(mm).

For n Kilometers(KM)
n Kilometer = n * 1000 Meters
n Kilometer = n * 100000 Centimeters
n Kilometer = n * 1000000 Millimeters

Convert Kilometer To Meter, Centimeter, Millimeter: C Program

[youtube https://www.youtube.com/watch?v=zj79Yj0-ctI]

YouTube Link: https://www.youtube.com/watch?v=zj79Yj0-ctI [Watch the Video In Full Screen.]

Source Code: Convert Kilometer To Meter, Centimeter, Millimeter: C Program

#include < stdio.h >

int main()
{
    float km, cm, mm, m;

    printf("Enter distance in Kelometer\n");
    scanf("%f", &km);

    m  = km * 1000.0;
    cm = km * 100000.0;
    mm = km * 1000000.0;

    printf("Distance in Meter is %f\n", m);
    printf("Distance in Centimeter is %f\n", cm);
    printf("Distance in Milimeter is %f\n", mm);

    return 0;
}

Output 1:
Enter distance in Kelometer
10
Distance in Meter is 10000.000000
Distance in Centimeter is 1000000.000000
Distance in Milimeter is 10000000.000000

Output 2:
Enter distance in Kelometer
5
Distance in Meter is 5000.000000
Distance in Centimeter is 500000.000000
Distance in Milimeter is 5000000.000000

Prefix	Symbol	Multiply by
yotta	Y	10²⁴
zetta	Z	10²¹
exa	E	10¹⁸
peta	P	10¹⁵
tera	T	10¹²
giga	G	10⁹
mega	M	10⁶
hectokilo	hk	10⁵
myria	ma	10⁴
kilo	k	10³
hecto	h	10²
deka	da	10¹
UNIT	1	10⁰
deci	d	10^-1
centi	c	10^-2
milli	m	10^-3
decimilli	dm	10^-4
centimilli	cm	10^-5
micro	µ	10^-6
nano	n	10^-9
pico	p	10^-12
femto	f	10^-15
atto	a	10^-18
zepto	z	10^-21
yocto	y	10^-24

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Perimeter of Rectangle: C Program

The length and breadth / width of a rectangle are entered through the keyboard. Write a program to calculate the perimeter of the rectangle.

To get perimeter of a rectangle, we add the length and width of rectangle and then multiply it with 2. In other words, perimeter is the addition of length of all the sides of a rectangle.

Note: Perimeter of a Rectangle is calculated using the formula
Perimeter = 2 * (Length + Width);

Length: is the length of the longest side of the rectangle.
width: is the length of the smallest side of the rectangle.

Find Perimeter of a Rectangle: C Program

[youtube https://www.youtube.com/watch?v=EnQTDhvimd0]

YouTube Link: https://www.youtube.com/watch?v=EnQTDhvimd0 [Watch the Video In Full Screen.]

Source Code: Find Perimeter of a Rectangle: C Program

#include < stdio.h >

int main()
{
    float length, width, perimeter;

    printf("Enter length of Rectangle\n");
    scanf("%f", &length);

    printf("Enter width of Rectangle\n");
    scanf("%f", &width);

    perimeter = 2 * (length + width);

    printf("Perimeter of Rectangle is %f\n", perimeter);

    return 0;
}

Output:
Enter length of Rectangle
12
Enter width of Rectangle
6
Perimeter of Rectangle is 36.000000

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Area of Rectangle: C Program

The length and breadth / width of a rectangle are entered through the keyboard. Write a program to calculate the area of the rectangle.

Rectangle is a quadrilateral(i.e., it has 4 sides). And all the 4 angles of the rectangle are of 90 degree. To calculate area of a rectangle we need its length and width/breadth.

Note: Area of a Rectangle is calculated using the formula
Area = Length * Width;

Length: is the length of the longest side of the rectangle.
width: is the length of the smallest side of the rectangle.

Find Area of a Rectangle: C Program

[youtube https://www.youtube.com/watch?v=yvgxG0hGqsY]

YouTube Link: https://www.youtube.com/watch?v=yvgxG0hGqsY [Watch the Video In Full Screen.]

Source Code: Find Area of a Rectangle: C Program

#include < stdio.h >

int main()
{
    float length, width, area;

    printf("Enter length of rectangle\n");
    scanf("%f", &length);

    printf("Enter width of rectangle\n");
    scanf("%f", &width);

    area = length * width;

    printf("Area of Rectangle is %f\n", area);

    return 0;
}

Output:
Enter length of rectangle
12
Enter width of rectangle
6
Area of Rectangle is 72.000000

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert

Convert Fahrenheit To Degree Celsius: C Program

Temperature of a city in Fahrenheit degree is input through the keyboard. Write a program to convert this temperature into Degree Celsius / Centigrade.

Formula to Convert Fahrenheit To Celsius.

From our previous video tutorial Convert Degree Celsius To Fahrenheit: C Program we already know the formula to convert temperature from Celsius to Fahrenheit. We will use the same formula and convert it to calculate Degree celsius from Fahrenheit.

Fahrenheit = (Centigrade * 1.8) + 32;
(Fahrenheit – 31) = (Centigrade * 1.8);
(Fahrenheit – 31) / 1.8 = (Centigrade);

So we’ll use this formula Centigrade = (Fahrenheit – 31) / 1.8; to calculate Degree Centigrade by getting Fahrenheit value from the user.

Convert Fahrenheit To Degree Celsius: C Program

[youtube https://www.youtube.com/watch?v=jBR9hco2O-w]

YouTube Link: https://www.youtube.com/watch?v=jBR9hco2O-w [Watch the Video In Full Screen.]

Source Code: Convert Fahrenheit To Degree Celsius: C Program

#include < stdio.h >

int main()
{
    float c, fh;

    printf("Enter temperature in Fahrenheit\n");
    scanf("%f", &fh);

    c = (fh - 32) / 1.8;

    printf("Temperature in Degree Celius is %f\n", c);

    return 0;
}

Output 1:
Enter temperature in Fahrenheit
212
Temperature in Degree Celius is 100.000000

Output 2:
Enter temperature in Fahrenheit
113
Temperature in Degree Celius is 45.000000

For list of all c programming interviews / viva question and answers visit: C Programming Interview / Viva Q&A List

For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert