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#include <stdio.h>
 
void nhapmang(int a[], int &n)
{
	printf("nhap vao so phan tu mang : ");
	scanf("%d", &n);
	for(int i=0;i<n;i++)
	{
		printf("a[%d]= ", i);
		scanf("%d", &a[i]);
	}
}
 
void xuatmang(int a[], int n)
{
	printf("cac phan tu trong mang la : ");
	for(int i=0;i<n;i++)
	{
		printf("\na[%d]= %d",i,a[i]);
	}
}
 
void xoakytu(int a[], int *n)
{
	int x;
	printf("nhap vao so muon xoa: ");
	scanf("%d", &x);
	hiep:
	for(int i=0;i<*n;i++)
	{
		if(a[i]==x)
		{
			for(int u=i ; u<*n ; u++)
			{
				a[u]=a[u+1];
			}
		  *n=*n-1;
		  goto hiep;
				}
			}
		}
main()
{
	int a[100],n,x;
	nhapmang(a, n);
	xuatmang(a,n);
	xoakytu(a,&n);
	xuatmang(a,n);
}

prog.c:3:28: error: expected ';', ',' or ')' before '&' token
 void nhapmang(int a[], int &n)
                            ^
prog.c:42:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main()
 ^
prog.c: In function 'main':
prog.c:45:2: warning: implicit declaration of function 'nhapmang' [-Wimplicit-function-declaration]
  nhapmang(a, n);
  ^
prog.c:44:15: warning: unused variable 'x' [-Wunused-variable]
  int a[100],n,x;
               ^

Standard output is empty