C Language Example - Implementing a Simple Calculator
Implement addition, subtraction, multiplication, and division calculations.
Example
# include <stdio.h>
int main() {
char operator;
double firstNumber,secondNumber;
printf("Enter operator (+, -, *, /):");
scanf("%c", &operator);
printf("Enter two numbers:");
scanf("%lf %lf",&firstNumber, &secondNumber);
switch(operator)
{
case '+':
printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber + secondNumber);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber - secondNumber);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber * secondNumber);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber / secondNumber);
break;
// operator doesn't match any case constant (+, -, *, /)
default:
printf("Error! operator is not correct");
}
return 0;
}
Output result is:
输入操作符 (+, -, *, /): * 输入两个数字: 4 5 4.0 * 5.0 = 20.0other extensions