An express calculator
This calculator can do the four basic operations. It needs to be added more functions for the future, like roots and trigonometric and exponential functions.
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#include <stdio.h>
#include <stdlib.h>
/* An express calculator */
int main()
{
char letter;
float num1, num2;
printf("What operation do you want to do?\n\tA)Addition\n\tB)Substraction\n\tC)Multiplication\n\tD)Division\n\n");
scanf("%c", &letter);
printf("\nPlease enter a number: ");
scanf("%f", &num1);
printf("Please enter a number: ");
scanf("%f", &num2);
if (letter == 'A' || letter == 'a')
printf("The sum of %.2f and %.2f is %.2f", num1, num2, num1 + num2);
else if (letter == 'B' || letter == 'b')
printf("The difference or substraction of %.2f and %.2f is %.2f", num1, num2, num1 - num2);
else if (letter == 'C' || letter == 'c')
printf("The multiplication of %.2f and %.2f is %.2f", num1, num2, num1 * num2);
else if (letter == 'D' || letter == 'd')
printf("The division of %.2f and %.2f is %.2f", num1, num2, num1 / num2);
else
printf("You entered an invalid character");
return 0;
}
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