Course
Introduction
C++ "Hello, World!" ProgramPrint Number Entered by UserAdd Two NumbersFind Quotient and RemainderFind Size of int, float, double and char in Your SystemSwap Two NumbersFind ASCII Value of a CharacterMultiply two NumbersDecisions and Loops
Check Whether Number is Even or OddCheck Whether a character is Vowel or ConsonantFind Largest Number Among Three NumbersFind All Roots of a Quadratic EquationCalculate Sum of Natural NumbersCheck Leap YearFind FactorialGenerate Multiplication TableDisplay Fibonacci SeriesFind GCDFind LCMReverse a NumberCalculate Power of a NumberCheck Whether a Number is Palindrome or NotCheck Whether a Number is Prime or NotDisplay Prime Numbers Between Two IntervalsCheck Armstrong NumberDisplay Armstrong Number Between Two IntervalsDisplay Factors of a NumberCreate Pyramid and PatternMake a Simple Calculator to Add, Subtract, Multiply or Divide Using switch...caseFunctions
Display Prime Numbers Between Two Intervals Using FunctionsCheck Prime Number By Creating a FunctionCheck Whether a Number can be Express as Sum of Two Prime NumbersFind Sum of Natural Numbers using RecursionCalculate Factorial of a Number Using RecursionFind G.C.D Using RecursionConvert Binary Number to Decimal and vice-versaConvert Octal Number to Decimal and vice-versaConvert Binary Number to Octal and vice-versaReverse a Sentence Using RecursionCalculate Power Using RecursionArrays and Strings
Calculate Average of Numbers Using ArraysFind Largest Element of an ArrayCalculate Standard DeviationAdd Two Matrix Using Multi-dimensional ArraysMultiply Two Matrix Using Multi-dimensional ArraysFind Transpose of a MatrixMultiply two Matrices by Passing Matrix to FunctionAccess Elements of an Array Using PointerSwap Numbers in Cyclic Order Using Call by ReferenceFind the Frequency of Characters in a StringFind the Number of Vowels, Consonants, Digits and White Spaces in a StringRemove all Characters in a String Except AlphabetsFind the Length of a StringConcatenate Two StringsCopy StringsSort Elements in Lexicographical Order (Dictionary Order)C Program to Make a Simple Calculator Using switch…case
To understand this example, you should have the knowledge of the following C programming topics:
This program takes an arithmetic operator +, -, *, / and two operands from the user. Then, it performs the calculation on the two operands depending upon the operator entered by the user.
Simple Calculator using switch Statement
#include <stdio.h>
int main() {
char op;
double first, second;
printf("Enter an operator (+, -, *, /): ");
scanf("%c", &op);
printf("Enter two operands: ");
scanf("%lf %lf", &first, &second);
switch (op) {
case '+':
printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
break;
// operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}
return 0;
}
Output
Enter an operator (+, -, *,): *
Enter two operands: 1.5
4.5
1.5 * 4.5 = 6.8
The * operator entered by the user is stored in op. And, the two operands, 1.5 and 4.5 are stored in first and second respectively.
Since the operator * matches case '*':, the control of the program jumps to
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
This statement calculates the product and displays it on the screen.
To make our output look cleaner, we have simply limited the output to one decimal place using the code %.1lf.
Finally, the break; statement ends the switch statement.