bank in C

#include<stdio.h>
#include <string.h>

int main()
{
    int a, b, c, d, deposit, withdrawn, balance=3500;
    char username[10], password[10], rpt[5];

    printf("\t* * * * * * * * * * * * *\n\t*\t1-> Balance     *\n\t*\t2-> Deposit     *\n\t*\t3-> Withdrawn   *\n\t*\t4-> Exit        *\n\t* * * * * * * * * * * * *\n\n");
    LOOP1:
    printf("Enter your username:\t\t");
    scanf("%s", &username);
    printf("Enter your password:\t\t");
    scanf("%s", &password);

    if(!strcmp(password,"1111") && !strcmp(username,"sumi"))
        LOOP2:
             do{
                printf("Enter your choice:\t\t");
                scanf("%d",&a);

                switch(a){
                    case 1: printf("Your balance is: \t\t%d\n",balance);
                            break;
                    case 2: printf("Enter your deposit amount:\t");
                            scanf("%d",&deposit);
                            balance=balance+deposit;
                            printf("Your new balance is: \t\t%d\n",balance);
                            break;
                    case 3: printf("Enter your withdrawn ammount:\t");
                            scanf("%d",&withdrawn);
                            balance=balance-withdrawn;
                            printf("Your new balance is: \t\t%d\n",balance);
                            break;
                    case 4: exit(0);
                            break;
                    default: goto LOOP2;
                    }
                printf("\n");
                LOOP3:
                printf("Do you want to check again (y/n): ");
                scanf("%s", &rpt);

                    if(!strcmp(rpt,"y")){
                        printf("\n");
                        goto LOOP2;
                    }
                else
                    if(!strcmp(rpt,"n")) exit(0);
                else
                    if((strcmp(rpt,"y")) || (strcmp(rpt,"n"))) goto LOOP3;
                }while(a!=4);

                else
                printf("\t\t\t\tWrong Username or Password!!! (Please Enter again)\n");
                goto LOOP1;

    return 0;
}