#include<stdio.h>
void main()
{
    float a1[5];//集合1
    float a2[5];//集合2
    int i,j,m;
    float  c[5];//求完的交集集合
    int select;//功能选择
    int k;//集合c数组下标
    for(i=0;i<5;i++)
    {
        printf("请输入第一个集合第%d个数",i+1);
        scanf("%f",&a1[i]);
    }
    for(i=0;i<5;i++)
    {
    printf("请输入第二个集合第%d个数",i+1);
    scanf("%f",&a2[i]);
    }
    printf("***********请选择功能*************\n");
    printf("1.求交集                          \n");
    printf("2.求补集                          \n");
    printf("3.求相对补集                      \n");
    printf("4.求对称差                        \n");
    scanf("%d",&select);
    switch(select)
    {
    case 1:
        for(i=0;i<5;i++)
        {
            for(j=0;j<5;j++)
            {
                  if(a1[i]==a2[j])
                  {
                      c[k]=a1[i];
                      k++;
                      printf("%f",c[k]);
                  }
            }
        }
       for(m=0;m<k;m++)
        {
             printf("  %f",c[m]);
        }
    }
        
}