การดำเนินการ Intersection (เซตตัด)
ถ้า Array 1 = {1,2,3,4,6}
Array 2 = {1,2,5,6,7}
Intersection = {1,2,6} (สมาชิกร่วม)
ตรรกะ:
k=0; for(i=0;i<size1;i++){ for(j=0;j<size2;j++){ if(a[i]==b[j]){ intersection[k]=a[i]; k++; } } }
โปรแกรม
โปรแกรม C ดำเนินการ Intersection บนอาร์เรย์ 2 ชุด:
#include<stdio.h> int removerepeated(int size,int a[]); void sort(int size,int a[]); main(){ int i,size1,size2,size,j=0,k,intersectionsize; printf("Enter size of an array1\n"); scanf("%d",&size1); printf("Enter size of an array2\n"); scanf("%d",&size2); int a[size1],b[size2],uni[size1+size2]; if(size1<size2){ intersectionsize=size1; }else if(size1>size2){ intersectionsize=size2; }else{ intersectionsize=size1; } int intersection[intersectionsize]; printf("Enter numbers for array 1\n"); for(i=0;i<size1;i++){ scanf("%d",&a[i]); } printf("Enter numbers for array 2\n"); for(i=0;i<size2;i++){ scanf("%d",&b[i]); } //Intersection starts k=0; for(i=0;i<size1;i++){ for(j=0;j<size2;j++){ if(a[i]==b[j]){ intersection[k]=a[i]; k++; } } } //Sorting sort(k,intersection); //Removing duplicates size=removerepeated(k,intersection); printf("Array after intersection\n"); if(size>0){ for(i=0;i<size;i++){ printf("%d\n",intersection[i]); } }else{ printf("No intersection\n"); } } int removerepeated(int size,int a[]){ int i,j,k; for(i=0;i<size;i++){ for(j=i+1;j<size;){ if(a[i]==a[j]){ for(k=j;k<size;k++){ a[k]=a[k+1]; } size--; }else{ j++; } } } return(size); } void sort(int size,int a[]){ int i,j,temp; for(i=0;i<size;i++){ for(j=i+1;j<size;j++){ if(a[i]>a[j]){ temp=a[i]; a[i]=a[j]; a[j]=temp; } } } }
ผลลัพธ์
Enter size of an array1 5 Enter size of an array2 2 Enter numbers for array 1 4 5 6 7 8 Enter numbers for array 2 4 1 Array after intersection 4
