使用FOR循环进行不同计算时出现问题

Question

如果成员资格为p &&金额> 1000.00，则对其进行计算。 如果成员资格为d &&金额> 750.00，则对其进行计算。

for (customer=1; customer<6; customer++){

    printf("\nCustomer %d",customer);
    printf("\nEnter membership level: ");
    scanf("%c",&membership);
    printf("\nEnter Purchase amount: ");
    scanf("%f",&amount);

检查客户状态         切换（成员）{

case 'p':
case 'P': 
/*check if the status is premium*/
            discount1 = amount * 0.10;
            discount2 = amount - discount1;
            printf("\nYou are eligible for TEN PERCENT discount.");
            printf("\nAmount payable : %.2f\n",discount2);
            printf("-------------------------------------");
            break;
case 'd':
case 'D':
check if the status is ordinary 
            discount1 = amount * 0.05;
            discount2 = amount - discount1;
            printf("\nYou are eligible for FIVE PERCENT discount.");
            printf("\nAmount payable : %.2f\n",discount2);
            printf("-------------------------------------");
            break;

default :
    printf("\nSorry. Invalid membership level. Enter m for ordinary or premium.");
    break;
    }
                                        }