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#include <stdio.h>
#include <stdlib.h>
//printf("\ntest %d\n", index);
int intInput();
void function1(int*, int&);
void function2(int*, int, int&);
void addValue(int*, int&);
void display(int*, int);
void search(int*, int);
void swap(int&, int&);
int delet(int*, int, int&);
void remove1(int*, int&);
void removeAll(int*, int&);
void increase(int*, int);
void decrease(int*, int);

int main(){
	int *arr;
	int index = 0;
	arr = (int*)malloc(index * sizeof(int));
	function1(arr, index);
	printf("Thankyou for using my program!");
	free(arr);
	return 0;
}

int intInput(){
	int i, output, check;
	char ch;
	while(1){
		check = scanf("%d%c", &output, &ch);
		fflush(stdin);
		if(check != 2 || ch != 10)
			printf("wrong input!\n");
		else return output;
	}
}

void function1(int *arr, int &index){
	int choice;
	while(1){
		printf("1- Add a value\n");
		printf("2- Search a value\n");
		printf("3- Remove the first existence of a value\n");
		printf("4- Remove all existences of a value\n");
		printf("5- Print out the array\n");
		printf("6- Sort the array in ascending order (positions of elements are preserved)\n");
		printf("7- Sort the array in descending order (positions of elements are preserved)\n");
		printf("Others- Quit\n");
		choice = intInput();
		if(choice < 1 || choice > 7)
			break;
		else
			function2(arr, choice, index);
		printf("--------------------------------\n");
		system("pause");
	}
}

void function2(int *arr, int choice, int &index){
	switch (choice){
		case 1:
			addValue(arr, index);
			break;
		case 2:
			search(arr, index);
			break;
		case 3:
			remove1(arr, index);
			break;
		case 4:
			removeAll(arr, index);
			break;
		case 5:
			display(arr, index);
			break;
		case 6:
			increase(arr, index);
			break;
		case 7:
			decrease(arr, index);
			break;
	}
}

void addValue(int *arr, int &index){
	index++;
	arr = (int*) realloc(arr, index * sizeof(int));
	printf("Input an integer to store: ");
	arr[index-1] = intInput();
}

void display(int *arr, int index){
	printf("All you current array:");
	for(int i = 0; i < index; i++)
		printf("\t%d", arr[i]);
	printf("\n");
}

void search(int *arr, int index){
	int number, i;
	printf("What number you wanna search? ");
	number = intInput();
	for(i = 0; i < index; i++){
		if(number == arr[i]){
			printf("Your Number is in slot number %d in array.\n", i+1);
			break;
		}
	}
	if(i == index)
		printf("Your Number not found.\n");
}

void swap(int &a, int &b){
	int temp = a;
	a = b;
	b = temp;
}

int delet(int *arr, int deletNum, int &index){
	int detector = NULL;
	for(int i = 0; i < index; i++){	//locating the delete number's index in array
		if(deletNum == arr[i]){
			detector = i;
			break;
		}
	}
	if(detector != NULL){
		arr[detector] = 0;
		for(int i = detector; i < index; i++)
			swap(arr[i], arr[i+1]);
		index--;
		arr = (int*) realloc(arr, index * sizeof(int));
		return 1;
	}
	else 
		return 0;
	
}

void remove1(int *arr, int &index){
	int deletNum;
	printf("What number you wanna remove? ");
	deletNum = intInput();
	if(delet(arr, deletNum, index)){
		printf("Removed!\n");
		display(arr, index);
	}
	else
		printf("Your number not found!\n");
	
}

void removeAll(int *arr, int &index){
	int deletNum, uselessAlert = 0;
	printf("What number you wanna remove? ");
	deletNum = intInput();
	for(int i = 0; i < index; i++){
		if(delet(arr, deletNum, index)){
			uselessAlert++;
		}
	}
	if(uselessAlert == 0)
		printf("Your number not found!\n");
	else
		printf("Removed all!\n");
	display(arr, index);
	
}

void increase(int *arr, int index){
	int copy[index];
	for(int i = 0; i < index; i++)
		copy[i] = arr[i];
	for(int i = 0; i < index-1; i++)
		for(int j = i+1; j < index; j++)
			if(copy[i] > copy[j])
				swap(copy[i], copy[j]);
	display(copy, index);
}

void decrease(int *arr, int index){
	int copy[index];
	for(int i = 0; i < index; i++)
		copy[i] = arr[i];
	for(int i = 0; i < index-1; i++)
		for(int j = i+1; j < index; j++)
			if(copy[i] < copy[j])
				swap(copy[i], copy[j]);
	display(copy, index);
}

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