Code printing extra memory garbage

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You are doing the computation (int price_final = (price - (price - 0.01); before you obtain the value of price. This is how the code should be:

if (value == 1) {
    float price = 0, price_final;

    printf ("INSERT A PRICE >> ");
    if (scanf ("%f", &price) == 0) {
        fprintf(stderr, "Invalid price");
        exit(EXIT_FAILURE);
    }

    price_final = price - (price - 0.01);
    printf ("Final value %f\n", price_final);
}

You’re also subtracting a float(0.01) from an int, which is undefined, so I changed both variables to float.

Also, I’d recommend that you read a line first with fgets and parse the string using sscanf:

char line[100];
fgets(line, 99, stdin);
int price;

if (sscanf(line, "%d", &price) == 0)
    handle error

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