else if (userInput == 'c' || userInput == 'C') {
            float userInputCredits = 0.0;
            printf("Plesae enter min number of credits: ");
            scanf("%f", &userInputCredits);
            float credits = 0.0;
            while (courses[index]!=-1) {
                credits = ((courses[index]>>1) & 7) + (courses[index] & 1)/10.0;
                if (credits >= userInputCredits) {
                    getListing(courses[index]);
                }
                index++;
            }