Interest calculation in C Language

-

Sample program : interest calculation

Consider the program, which calculates the value of money at the end of each year of investment, assuming an interest rate of 11 percent and prints the year and the corresponding amount, in two columns. The output is shown in fig 2 for period of 10 years with an initial investment of 5000.00. 

The program uses the following formula :

Value at the end of year = value at start of year (1+interest rate)

In the program, the variable value represents the value of money at the end of the year while amount represents the value of money at the start of the year.

The statement

                amount = value ;

makes the value at the end of the current year as the value at start of the next year.



Let us consider the new features introduced in this program. The second and third lines begin with #define instructions. A #define instruction defines value to a symbolic constant for use in the program. Whenever a symbolic name is encountered, the compiler substitutes the value associated with the name automatically. To change the value, we have to simply change the definition. In this example, we have defined two symbolic constants PERIOD and PRINCIPAL and assigned values 10 and 5000.00 respectively. These values remain constant throughout the execution of the program.




We must note that the defined constants are not variables. We may not change their values within the program by using an assignment statement.

For example, the statement

PRINCIPAL = 10000.00 ;

is illegal.

The declaration section declares year as integer and amount, value and inrate as floating point numbers. Note the floating-point variables are declared in one statement. They can also be declared as
                float amount ;
                float value ;
                float inrate ;

When two or mote variables are declared in one statement, they are separated by a comma.

All computations and printing are accomplished in a while loop. while is a mechanism for evaluating repeatedly a statement or a group of statements. In this case as long as the value of year is less than or equal of the value of PERIOD, the four statements that follow while are executed. Note that these four statements are grouped by braces. We exit the loop when year becomes greater than PERIOD.
C supports the basic four arithmetic operators( -, +, *, / ) along with several others.

Comments

Post a Comment

Popular posts from this blog

Addition 2 number in C Language

-
Image
Sample Program : Addition of two numbers Consider the program, which performs addition on two numbers and displays the result. The program is following : This program when executed will product the following output : 100 106.10 The first two lines of the program are comment lines. It is a good practice to use comment lines in the beginning to give information such as name of the program, author, date etc. Comment characters are also used in other lines to indicate line numbers. The words number and amount are variable names that are used to store numeric data. The numeric data may be either in integer form or in real form. In C, all variables should be declared to tell the compiler what the variable names are and what type of data they hold. The variables must be declared before they are used. In lines 5 and 6, the declarations : int number; float amount; tell the compiler that number is an integer( int ) and amount is a floating( float...
Read more

Input and Output in C

-
Input : C supports a number of ways for taking user input. getchar() Returns the value of the next single character input. For example : #include <stdio.h> int main()  {   char a = getchar();   printf("You entered: %c", a);   return 0; } The input is stored in the variable a. The gets() function is used to read input as an ordered sequence of characters, also called a string. A string is stored in a char array. For example :  #include <stdio.h> int main()  {   char a[100];   gets(a);   printf("You entered: %s", a);   return 0; } Here we stored the input in an array of 100 characters. scanf() scans input that matches format specifiers. For example : #include <stdio.h> int main()  {   int a;   printf("Please enter an element : ", a);   scanf("%d", &a);    return 0; } The " &" sign before the variable name is th...
Read more

Comments in C

-
Comments : Comments are explanatory information that you can include in a program to benefit the reader of your code. The compiler ignores comments, so they have no affect on a program. A comment starts with a slash asterisk /* and ends with an asterisk slash */ and can be anywhere in your code. Comments can be on the same line as a statement, or they can span several lines. For example: #include <stdio.h> /* A simple C program  * Version 1.0  */ int main() {   /* Output a string */   printf("Hello World!");   return 0; } Note :  As you can see, comments clarify the program's intent to the reader. Use comments to clarify the purpose and logic behind segments of code. Single-line Comments :  C++ introduced a double slash comment // as a way to comment single lines. Some C compilers also support this comment style. For example:  #include <stdio.h> int main() {   int x = 42; //int for a who...
Read more