Bài tập tổng quát - quản lý mảng số nguyên - Lập trình C

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

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

int main(int argc, char *argv[]) {
	//B1. Khai bao mang dataList
	int dataList[100], count = 0, i, choose, j;
	
	do {
		printf("\n1. Them");
		printf("\n2. Sap xep");
		printf("\n3. Tim kiem");
		printf("\n4. Xoa");
		printf("\n5. Hien thi");
		printf("\n6. Thoat");
		printf("\nChon: ");
		scanf("%d", &choose);
		
		switch(choose) {
			case 1: {
				printf("\nNhap dataList[%d] = ", count);
				scanf("%d", &dataList[count]);
				count++;
				//scanf("%d", &dataList[count++]);
				break;
			}
			case 2: {
				for(i=0;i<count-1;i++) {
					for(j=i+1;j<count;j++) {
						if(dataList[i] > dataList[j]) {
							int tmp = dataList[j];
							dataList[j] = dataList[i];
							dataList[i] = tmp;
						}
					}
				}
				printf("\nSap xep thanh cong!!!");
				break;
			}
			case 3: {
				int search, num = 0;
				printf("\nNhap phan tu can tim: ");
				scanf("%d", &search);
				
				for(i=0;i<count;i++) {
					if(dataList[i] == search) {
						num++;
					}
				}
				
				if(num > 0) {
					printf("\nSo phan tu tim duoc: %d", num);
				} else {
					printf("\nKhong tim thay phan tu nao");
				}
				break;
			}
			case 4: {
				int del;
				printf("\nNhap phan tu can xoa: ");
				scanf("%d", &del);
				
				for(i=0;i<count;i++) {
					if(dataList[i] == del) {
						//Tim thay phan tu xoa
						for(j=i+1;j<count;j++) {
							dataList[j-1] = dataList[j];
						}
						i--;
						count--;
					}
				}
				printf("\nXoa thanh cong!!!");
				break;
			}
			case 5: {
				printf("\nDanh sach cac phan tu trong mang: ");
				for(i=0;i<count;i++) {
					printf("%d ", dataList[i]);
				}
				break;
			}
			case 6: {
				printf("\nThoat chuong trinh!!!");
				break;
			}
			default: {
				printf("\nNhap sai!!!");
				break;
			}
		}
	} while(choose != 6);
	
	return 0;
}