1)
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
const int N = 58;
int main()
{
	float a = 2.14, b = -4.21, c = 3.25, xn = -4.5, xk = -33.5, h = 0.5;
	int A[N];
	for (int i = 0; i <= 57; i++)
	{
		A[i] = a * pow(xn, 2) * sin(xn) + b * xn + c;
		xn -= h;
	}
	for (int i = 0; i < N - 1; i++) {
		for (int j = 0; j < N - 1 - i; j++) {
			if (A[j] < A[j + 1]) {
				int temp = A[j];
				A[j] = A[j + 1];
				A[j + 1] = temp;
			}
		}
	}
	for (int i = 0; i < N; i++) {
		printf("%d ", A[i]);
	}
}
----------------------------------------------------------------------
2)
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
const int N = 15;
int main()
{
	int A[N], flag = 1;
	for (int i = 0; i < N; i++)
		A[i] = (int)rand() * (10 - 0) / RAND_MAX + 0;
	for (int i = 0; i < N; i++)
	{
		for (int j = i + 1; j < N; j++)
		{
			if (A[i] == A[j])
				flag = 0;
		}
		if (flag)
			printf("%d ", A[i]);
		flag = 1;
	}
}
-----------------------------------------------------------------------------
3)
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
const int N = 20;
int main()
{
	float A[N], B[N];
	int j = 0;
	for (int i = 0; i < N; i++)
		A[i] = (float)rand() / (float)(RAND_MAX / 20) - 10;
	for (int i = 0; i < N; i++)
	{
		if (A[i] >= 0) { B[j] = A[i]; j++; }
		printf("%f ", A[i]);
	}
	printf("\n");
	for (int i = 0; i < j; i++)
		printf("%f ", B[i]);
}
---------------------------------------------------------------------------
4)
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
const int N = 20;
const int N1 = 40;
int main()
{
	int C[N], D[N], E[N1];
	for (int i = 0; i < N; i++)
	{
		C[i] = (int)rand() * (20 - 0) / RAND_MAX + 0;
		D[i] = (int)rand() * (20 - 0) / RAND_MAX + 0;
	}
	for (int i = 0; i < N - 1; i++) {
		for (int j = 0; j < N - 1; j++) {
			if (C[j] > C[j + 1]) {
				int temp = C[j];
				C[j] = C[j + 1];
				C[j + 1] = temp;
			}
		}
	}
	for (int i = 0; i < N - 1; i++) {
		for (int j = 0; j < N - 1; j++) {
			if (D[j] > D[j + 1]) {
				int temp = D[j];
				D[j] = D[j + 1];
				D[j + 1] = temp;
			}
		}
	}
	for (int i = 0, j = 0, k = 0; k < N1; k++)
	{
		if (i < N && C[i] < D[j])
		{
			E[k] = C[i];
			i++;
		}
		else
		{
			E[k] = D[j];
			j++;
		}
	}
	for (int k = 0; k < N1; k++)
		printf("%d\n", E[k]);
}