#include <stdio.h>
#include <stdlib.h>
void print(int size, char arr[])
{if (size == 0) {printf("null");}for (int i = 0; i < size; i++) {printf("%c", arr[i]);}printf("\n");
}
int main()
{char U[] = { 'a','b','c','d','e','f','g','h' };char A[] = { 'a','b','c','g' };char B[] = { 'd','e','f','g' };char C[] = { 'a','c','f' };char D[] = { 'f','h' };int M = sizeof(A) / sizeof(A[0]);//计算A集合的大小int N = sizeof(B) / sizeof(B[0]);//计算B集合的大小int P = sizeof(C) / sizeof(C[0]);//计算C集合的大小int Q = sizeof(D) / sizeof(D[0]);//计算D集合的大小int R = sizeof(U) / sizeof(U[0]);//计算U集合的大小char E[100] = { '0' };char F[100] = { '0' };char G[100] = { '0' };char H[100] = { '0' };char I[100] = { '0' };char J[100] = { '0' };char K[100] = { '0' };char L[100] = { '0' };int size = 0;//标记结果集合的大小for (int i = 0; i < M; i++) {for (int j = 0; j < N; j++) {if (A[i] == B[j]) {E[size] = A[i];size++;break;}}}printf("A∩B    ：");print(size, E);int Size = 0;for (int i = 0; i < size; i++) {int find = 0;for (int j = 0; j < P; j++) {if (E[i] == C[j]) {find = 1;break;}}if (find == 0) {K[Size] = E[i];Size++;}}printf("(A∩B)-C:");print(Size, K);size = 0;for (int i = 0; i < N; i++) {for (int j = 0; j < P; j++) {for (int k = 0; k < Q; k++) {if ((B[i] == C[j]) && (C[j] == D[k])){G[size] = B[i];size++;}}}}printf("B∩C∩D  ：");print(size, G);size = 0;for (int i = 0; i < N; i++) {F[size] = B[i];size++;}for (int i = 0; i < P; i++) {int find = 0;for (int j = 0; j < N; j++) {if (C[i] == B[j]) {find = 1;break;}}if (find == 0) {F[size] = C[i];size++;}}printf("B∪C    ：");print(size, F);Size = 0;for (int i = 0; i < M; i++) {for (int j = 0; j < size; j++) {if (A[i] == F[j]) {J[Size] = A[i];Size++;}}}printf("A∩(B∪C)：");print(Size, J);Size = 0;for (int i = 0; i < size; i++) {L[Size] = F[i];Size++;}for (int i = 0; i < M; i++) {int find = 0;for (int j = 0; j < size; j++) {if (A[i] == F[j]) {find = 1;break;}}if (find == 0) {L[Size] = A[i];Size++;}}printf("A∪B∪C  :");print(Size, L);size = 0;for (int i = 0; i < R; i++) {int find = 1;for (int j = 0; j < M; j++) {if (U[i] == A[j]) {find = 0;break;}}if (find == 1) {H[size] = U[i];size++;}}printf("A的补集：");print(size, H);size = 0;for (int i = 0; i < P; i++) {int find = 0;for (int j = 0; j < Q; j++) {if (C[i] == D[j]) {find = 1;break;}}if (find == 0) {I[size] = C[i];size++;}}printf("C-D    ：");print(size, I);Size = 0;return 0;
}