# An express calculator by Jefferson Jose Torres Munoz

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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