Thread: How to determine if input is numerical

I'm writing a program to work with complex numbers. It actually works well for what I need it for but there is a problem I would like to solve. Here is the code in question:

Code:

    int option;
    do {
        printf("\nHere are the options for the complex number arithmetic program:");
        printf("\n1. Add two complex numbers.");
        printf("\n2. Subtract two complex numbers.");
        printf("\n3. Multiple two complex numbers.");
        printf("\n4. Divide two complex numbers.");
        printf("\n5. Find the conjugate of a complex number.");
        printf("\nEnter the number of your choice and press enter:");
        scanf("%d",&option);
} while (option<1 || option>5);
printf("SUCCESS");

Right now if I enter a number it works quite well. But let's say I entered the word "banana". The program crashes. How can I avoid this?