arithmetic operations

In this video tutorial lets learn how we can calculate Simple Interest by making use of simple arithmetic operations.

 
#include<stdio.h>

int main()
{
    int p, t;
    float r, si;

    printf("Enter principal amount\n");
    scanf("%d", &p);

    printf("Enter Rate of interest\n");
    scanf("%f", &r);

    printf("Enter time period\n");
    scanf("%d", &t);

    si = (p * t * r) / 100.0;

    printf("Simple Interest is %f\n", si);

    return 0;
}

Output:
Enter principal amount
1000
Enter Rate of interest
14
Enter time period
2
Simple Interest is 280.000000

Scanf(): For user input

In above c program we are asking user to enter the values for variable a and b. You can know more about scanf() method/function in this video tutorial: Using Scanf in C Program

C Program to Calculate the Simple Interest

[youtube https://www.youtube.com/watch?v=DtgTB1ndPrE]

YouTube Link: https://www.youtube.com/watch?v=DtgTB1ndPrE [Watch the Video In Full Screen.]

In this program we take input for Principal amount, rate of interest and time period from the user, and then calculate Simple Interest for those values.

Simple Interest Logic

We make use of arithmetic operations available in C programming language and convert this formula to calculate Simple Interest.

Simple_Interest = ( Principal_amount * Rate_of_interest * Time) / 100.0;

This gives us Simple Interest and we output the result to the console.

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

Today lets learn about basic arithmetic operations in C programming language.

What we learn in this video tutorial?

We shall learn, addition, subtraction, multiplication, division and modular division in this video tutorial. And we’ll also learn how to use pow() method present in math.h library file.

 
#include < stdio.h >
#include < math.h >

int main()
{
    int   a = 10, b = 2;
    char  m = 'A', n = 'a';

    printf("\nAddition of a and b is %d\n", (a+b));
    printf("\nSubtraction of a and b is %d\n", (a-b));
    printf("\nMultiplication of a and b is %d\n", (a*b));
    printf("\nDivision of a and b is %d\n", (a/b));
    printf("\nModular Division of a and b is %d\n", (a%b));
    printf("\n3 to the power of 2 is %f\n", pow(3,2));

    printf("\nASIIC value of A and a is %d and %d\n\n", m, n);

    return 0;
}

Output:

Addition of a and b is 12
Subtraction of a and b is 8
Multiplication of a and b is 20
Division of a and b is 5
Modular Division of a and b is 0
3 to the power of 2 is 9.000000
ASIIC value of A and a is 65 and 97

Basic Arithmetic Operations In C

[youtube https://www.youtube.com/watch?v=4mjiL9uwPCg]

YouTube Link: https://www.youtube.com/watch?v=4mjiL9uwPCg [Watch the Video In Full Screen.]

Precedence and associativity of arithmetic operators

1st priority: * / %
2nd priority: + –
3rd priority: =

When there is tie between same priority operators then we check the associativity. For example, for * and /, associativity is same. i.e., left to right.

So in the expression: c = a * b + a / b;
a * b gets executed first.

ASCII values

When you try to apply Arithmetic Operation on characters(alphabets, character digits, special characters) its correspondent ASCII value gets operated on. ASCII value of A is 65 and ASCII value of a is 97. This is the reason why capital A and small letter a are treated differently in C programming language. Under the hood, they have different ASCII values.

Note 1: All the variables and constants are called operands. All the arithmetic symbols(+, -, /, *, %) are called operators. = is called assignment operator.

Note 2: Only one variable is allowed on the left hand side of the equation or expression.
Ex:
c = a + b is valid.
a + b = c is invalid.

Note 3: You can’t store a decimal value in a integer variable. So if the result of evaluation of an expression has decimal value and you’re assigning it to an integer variable, then only the integer part gets stored. Decimal part will be discarded. So be careful while choosing the data type of variables while performing arithmetic operation.

Note 4: We need to always, explicitly mention the arithematic operators.
Ex:
c = (a + b)(a – b) throws error.
c = (a + b) * (a – b); is the correct way in C programming.

Note 5: An integer value divided by an integer value gives back an integer value. A float value divided by a float value gives back a floating point value.

Note 6: Modular division gives reminder of division.
Ex:
c = 10 / 2; gives c = 5;
c = 10 % 2; give c = 0;

Also,
c = -3 % 2; gives c = -1
c = 3 % -2; gives c = 1

Modular division doesn’t take float values as its operands.
Ex: c = 3.0 % 2.0; gives error

Note 7: math.h library file has other mathematical operations related methods like: pow(), sin(), cos(), tan(), abs(), sqrt() etc.

We’ll look more arithmetic operators as and when we encounter them in programs.

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