[Metal_Rex]

Ist der Code von Your_Conscience aber der hat keine Zeilen also der Teil:

    switch(choice) {
        case 1: costs = 1.85;
                printf("\nYou choose Coca Cola. Please insert 1.85$: "); break;

        case 2: costs = 1.45;
                printf("\nYou choose Ice Tea. Please insert 1.45$: "); break;

        case 3: costs = 1.20;
                printf("\nYou choose Water. Please insert 1.20$: "); break;

        default: printf("\nYou choose nothing. See you!"); break;
    }

Zeile 31/32:

case 3: costs = 1.20;
                printf("\nYou choose Water. Please insert 1.20$: "); break;