Code bị lỗi expected declaration or statement at end of output

[Dinh_Thuan_Phong]

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	int chon;
	menu:
		printf("\n");
		system("pause");
		system("cls");
	do{
		printf("\n\t------------------------------");
	printf("\n\t1-Kiem Tra So Nguyen");
	printf("\n\t2-Tim Uoc Chung va Boi Chung Cua 2 So");
	printf("\n\t3-Tinh Tien Cho Quan Karaoke");
	printf("\n\t4-Tinh Tien Dien");
	printf("\n\t5-Tinh Lai Suat Ngan Hang Vay Tra Gop");
	printf("\n\t6-Sap Xep Thong Tin Sinh Vien");
	printf("\n\t7-Tinh Toan Phan So");
	printf("\n\t0-Thoat khoi chuong trinh");
	printf("\n\t------------------------------");
	printf("\n\tMoi ban chon chuc nang: ");
	scanf("%d",&chon);
	
	switch (chon){
		case 1:{
			printf("\n\tDay la chuong trinh Kiem Tra So Nguyen !");
			//x co phai la mot so nguyen hay khong?
			int x,a;
			printf("\n\tVui long nhap vao mot so bat ky: ");
			scanf("%d",&x);
			if(x==(int)x){
				printf("\n\t%Day la so nguyen: %.2d",x);
				
			    }else
				   printf("\n\t%.2dDay khong la so nguyen !",x);
			//x co phai la mot so nguyen to hay khong?
		           	   if(x<2){
				           printf("\n\tDay khong phai la so ngto: %d",x);
			}
			                   int count=0;
			                   int i=2;
			                       for (;i<=sqrt(x); i++){
				                   if(x%i==0){
					                   count=0;
					                   break;
				}
			}
			                               if(count==0){
				                               printf("\n\tDay la mot so ngto: %d",x);
				
			                                   }else
				                                   printf("\n\tDay khong phai la mot so ngto: %d",x);
			//x co phai la mot so chinh phuong hay khong?
			                                       if(x>0){
				                                   a=sqrt(x);
				                                       if((a*a)==x)
				                                           printf("Day la so chinh phuong!");
				                                           
				                                               else
				                                               printf("Day khong phai la so chinh phuong!");
			}		
			goto menu;
		}
		
		case 2:{
			printf("\n\tDay la chuong trinh Tim Uoc Chung va Boi Chung Cua 2 So");
			int a,b;
			quayveCase1:			
			printf("\n\tVui long nhap vao hai so nguyen duong a, b: ");
			scanf("%d%d",&a,&b);
			
			if(a>=0 && b>=0){
				printf("\n\tKhong ton tai ucln va bcnn cua hai so tren !");
			}
			    else {
				int c= a*b;
				while (a!=b){
					if(a>b){
						a= a-b;
					}
					        else{
						    b= b-a;
					}
				}
				                 printf("\n\tUcln= %d",a);
				                 printf("\n\tBcnn= %d",c/a);
			}
			goto menu;
		}
		case 3:{
			printf("\n\t-Chuc nang 3: Tinh tien cho quan karaoke");
			break;
		}
				
		case 4:{
			printf("\n\t-Chuc nang 4: Tinh tien dien");
			float soDien, tienDien;
			
 int bac1=1678, bac2=1734, bac3=2014, bac4=2536, bac5=2834, bac6=2927;
 printf("Nhap vao so dien cua ban (kWh): ");
 scanf("%f",&soDien);
 
 if(soDien<0){
 printf("\nVui long nhap lai So Dien\nSo dien khong duoc nho hon 0\n");
   }else if(soDien<=50){
    tienDien=soDien*bac1;
    printf("\nban da dung dien trong khoang 0 - 50 kWh so tien ban phai tra la: %.2f",tienDien);
    
      }else if(soDien<=100){
       tienDien=50*bac1+((soDien-50)*bac2);
       printf("\nban da dung dien trong khoang 51 - 100 kWh so tien ban phai tra la: %.2f",tienDien);
       
         }else if(soDien<=200){
          tienDien=50*bac1+(50*bac2)+((soDien-100)*bac3);
          printf("\nban da dung dien trong khoang 101 - 200 kWh so tien ban phai tra la: %.2f",tienDien);
  
            }else if(soDien<=300){
             tienDien=50*bac1+(50*bac2)+(100*bac3)+((soDien-200)*bac4);
             printf("\nban da dung dien trong khoang 201 - 300 kWh so tien ban phai tra la: %.2f",tienDien);
  
               }else if(soDien<=400){
                tienDien=50*bac1+(50*bac2)+(100*bac3)+(100*bac4)+((soDien-300)*bac5);
  				printf("\nban da dung dien trong khoang 301 - 400 kWh so tien ban phai tra la: %.2f",tienDien);
  
 				  }else if(soDien>400){
  				   tienDien=50*bac1+(50*bac2)+(100*bac3)+(100*bac4)+(100*bac5)+((soDien-400)*bac6);
  				   printf("\nban da dung dien tren 400 kWh so tien ban phai tra la: %.2f",tienDien);
}
	goto menu;	
}
		case 6:{
			printf("\n\t-Chuc nang 6: Sap Xep Thong Tin Sinh Vien");
			break;
		}
																			
}
	
	}while(1==1);

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[kisuluoibieng (Tên Gì Cũng Được)]

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