I am trying to make a program that if the user gives a whole arithmetic operation from the keyboard ex `5*4` or `5/7` it will interpret the operation ex `*`, `/`, `+`, or `-` and print the result. How can I read the whole operation without the user pressing enter everytime he puts a number or a symbol ex `*` or `/` and put them in 3 variables?
I tried using:

```
printf("give an operation")
scanf("%d%c%d",&num_1,&c,&num_2)

```

but I want to do with:

```
c=getchar()

```