#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void do_next_op(char operator, double operand, double *sum);
void scan_data(char *operator, double *operand);



int main(void){

    double operand, akkumulator;
    char operator;
    akkumulator = 0;


    scan_data(&operator, &operand);
    printf("%c %lf", operator, operand);
    do_next_op(operator, operand, &akkumulator);
    printf("RESULT: %lf\n", akkumulator);



    return EXIT_SUCCESS;
}

/* PROMPT FOR INPUT */
void scan_data(char *operator, double *operand){
    printf("Indtast en operator efterfulgt af en operand:");
    fflush(stdin);
    scanf(" %c %lf", &operator, &operand);
}

/* OPERATOR BLOK AKA. HVAD SKAL DER SKE MED AKKUMULATOREN */
void do_next_op(char operator, double operand, double *sum){
    switch (operator)
    {
        case '+':{
            *sum = *sum + operand;
            break;
        }
        case '-':{
            *sum = *sum - operand;
            break;
        }
        case '*':{
            *sum = *sum * operand;
            break;
        }
        case '/':{
            *sum = *sum / operand;
            break;
        }
        case '^':{
            *sum = pow(*sum, operand);
            break;
        }
        case '#':{
            *sum = sqrt(*sum);
            break;
        }
        case '%':{
            *sum = *sum*(-1);
            break;
        }
        case '!':{
            *sum = 1 / *sum;
            break;
        }
        default:{
            break;
        }
    }
}