///////////////////////////////////
//
// program_2 project
//
// created 8/12/21 by tj
// rev 0
//
///////////////////////////////////
//
// Program to provide various calculations
//
// Reads in a values for val1 and val2
// Reads in the desired operation
// Provides the result
//
// inputs: 2 values for val1 and val2, a character for the operation
// outputs: prints result of val1 operation val2
//
///////////////////////////////////

#include "mbed.h"
#include <stdio.h>                      // only needed when printing

int main(void){
    setbuf(stdout, NULL);  // disable buffering when printing

    // splash 
    printf("\n\nprogram_2\n");
    printf("Using Mbed OS version %d.%d.%d\n\n", 
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
    printf("Welcome to my calculator program\n\n");
    
    float val1;
    float val2;
    char operation;
    float result; 

    // infinite loop
    while(1){       
        // ask for and read in values and operation
        printf("Please enter a value for left side of the operation ");
        scanf("%f", &val1);
        printf("Please enter a value for right side of the operation ");
        scanf("%f", &val2);
        printf("Please enter the operation requested \(+ - * /): ");
        scanf(" %c", &operation);
            
        // select the calculation and execute
        switch(operation){
            case '+':
                result = val1 + val2;
                printf("%f %c %f = %f\n\n", val1, operation, val2, result);
                break;
            case '-':
                result = val1 - val2;
                printf("%f %c %f = %f\n\n", val1, operation, val2, result);
                break;
            case '*':
                result = val1 * val2;
                printf("%f %c %f = %f\n\n", val1, operation, val2, result);
                break;
            case '/':
                result = val1 / val2;
                printf("%f %c %f = %f\n\n", val1, operation, val2, result);
                break;
            default:
                printf("invalid operation\n\n");
                break;
        } // end switch
    }// end while
            
   return 0;
}// end main