- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ Program to Calculate Simple Interest
This article contains some programs in C++ that are used to find, calculate, and print simple interest based on the data entered by the user at run-time. The following information must be entered by the user at run-time:
- principle amount: amount of money that has to be deposited or borrowed.
- rate of interest: the interest rate that has to be paid or received in return.
- time period: for how many years has the money been deposited or borrowed?
If you're getting confused about the above data, then forget that and look at the formula for simple interest, given below, and then its program. After reading all the things provided here, you'll know everything about the program.
Formula to calculate simple interest
The formula to find simple interest is:
SI = (P*R*T)/100
where SI stands for simple interest, P stands for the principle amount (deposit or loan amount), R stands for the rate of interest, and T stands for the time period (in years).
Calculate Simple Interest in C++
The question is, "Write a program in C++ to find and print simple interest based on the P, R, and T (data) entered by the user at run-time." The program given below is the answer to this question:
#include<iostream> using namespace std; int main() { float p, r, t, si; cout<<"Enter Principle Amount: "; cin>>p; cout<<"Enter Rate of Interest: "; cin>>r; cout<<"Enter Time Period: "; cin>>t; si = (p*r*t)/100; cout<<"\nSimple Interest Amount: "<<si; cout<<endl; return 0; }
The following snapshot is taken from the initial output of the above C++ program for calculating simple interest:
Now enter the data, say 246,000 as the principle amount, 7.5 as the rate of interest, and 4 as the time period. Hit the ENTER key to calculate and print the simple interest amount as shown in the snapshot given below:
The calculation of simple interest based on P = 246000, R = 7.5, and T = 4 goes in this way:
SI = (P*R*T)/100 = (246000*7.5*4)/100 = (246000*30)/100 = (7380000)/100 = 73800
That is, you'll get the return of $73,800 if you have deposited the amount; otherwise, you'll have to pay $73,800 if you've borrowed the loan from an individual, a bank, or any other source.
Note: Enter the time period in years only. If you want to go for six months, then enter 6/12, which is 0.5 year.
For a more interactive and good user experience program, you can also modify the above program in a way that the user gets options for whether to enter the time period in years or months, as shown in the program given below:
#include<iostream> using namespace std; int main() { float p, r, t, si; char ch; cout<<"Enter Principle Amount: "; cin>>p; cout<<"Enter Rate of Interest: "; cin>>r; cout<<"Time Period in Year or Month ? (y for year, m for month): "; cin>>ch; if(ch=='y') { cout<<"Enter Time Period (in Years): "; cin>>t; si = (p*r*t)/100; } else { cout<<"Enter Time Period (in Months): "; cin>>t; t = t/12; si = (p*r*t)/100; } cout<<"\nSimple Interest Amount: "<<si; cout<<endl; return 0; }
Here is its sample run with 1000 as the principle amount, 10 as the rate of interest, and m as the choice (for months as the time period), and finally 4 as the total number of months as the time period:
Using the function, compute simple interest
Let's create the same program, that is, calculating simple interest, but instead of using the normal process, use a user-defined function named find_si(). This function takes three arguments for p (principal amount), r (rate of interest), and t (time period):
#include<iostream> using namespace std; float find_si(float, float, float); int main() { float p, r, t, si; cout<<"Enter Principle Amount: "; cin>>p; cout<<"Enter Rate of Interest: "; cin>>r; cout<<"Enter Time Period: "; cin>>t; si = find_si(p, r, t); cout<<"\nSimple Interest Amount: "<<si; cout<<endl; return 0; } float find_si(float a, float b, float c) { float si; si = (a*b*c)/100; return si; }
This program generates similar results to the previous program. The only difference is that this program was created using a user-defined function.
Calculate simple interest using the class
This is the last program created using classes. That is, the fresherearth class is created.Inside the class, I've created a private variable named res and a public function named find_si(). Now, using the class, I've defined the function named find_si(), as done in the previous program.
Inside the main() method, I've created an object of the class fresherearth. So that, using the object cc_obj, I can access the member function (find_si()) of the class (fresherearth):
#include<iostream> using namespace std; class fresherearth { private: int res; public: float find_si(float, float, float); }; float fresherearth::find_si(float a, float b, float c) { res = (a*b*c)/100; return res; } int main() { float p, r, t, si; fresherearth cc_obj; cout<<"Enter Principle Amount: "; cin>>p; cout<<"Enter Rate of Interest: "; cin>>r; cout<<"Enter Time Period: "; cin>>t; si = cc_obj.find_si(p, r, t); cout<<"\nSimple Interest Amount: "<<si; cout<<endl; return 0; }
This program generates output that is similar to the output of the first program.
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