Question

Write a c program that finds the uncommon elements from two array elements using pointers only .

For example : Enter the length of the array one : 5

Enter the elements of the array one: 9 8 5 6 3

Enter the length of the array two: 4

Enter the elements of the array two: 6 9 2 1

output: 8 5 3 2 1

void uncommon_ele(int *a, int n1, int *b, int n2, int *c, int*size);

The function should use pointer arithmetic – not subscripting–to visit array elements. In

other words, eliminate the loop index variables and all use of the [] operator in the function.

The uncommon_ele function finds the elements that in either array a or array b, but not both, and stores the result in array c. The function takes an int array parameters a1 and 2 as the first parameter and third parameters and the number of elements of the arrays as the second parameter.

The sixth parameter size points to a variable in whi ch the function will store thenumber of

actual elements in array c.

Answer 1

//code is explained in comments

#include <stdio.h>
#include <stdlib.h>

void uncommon_ele(int *a,int n1,int*b,int n2,int *c,int *size){
   int actualSize=0;
   for(int i=0;i<n1;++i){//to get uncommon elements in a
   int statusflag=1;
   for(int j=0;j<n2;++j){
  
   if(a[i]==b[j]){
   statusflag=0;
   break;
   }
   }
   if(statusflag==1){
   c[actualSize++]=a[i];
   }
   }
   for(int i=0;i<n2;++i){//to get uncommon elements in b
   int statusflag=0;
   for(int j=0;j<n1;++j){
  
   if(b[i]==a[j]){
   statusflag=1;
   break;
   }
   }
   if(statusflag==0){
   c[actualSize++]=b[i];
   }
   }
  
   *size=(actualSize);//assign size
   c=(int*)realloc(c,sizeof(int)*(actualSize));//reallocate with uncommon element memory
}

int main(){
   int *a;
   int *b;
   int *c;
   int size=0;
   int n1;
   int n2;
   printf("Enter length of array one : ");
   scanf("%d",&n1);
   a=(int*)malloc(sizeof(int)*n1);//allocate memory of n1 size
   printf("Enter the elements of the array one ");
   for(int i=0;i<n1;i++){//enter elements into arrray a
       scanf("%d",&a[i]);
   }
   printf("Enter length of array two : ");
   scanf("%d",&n2);
   b=(int*)malloc(sizeof(int)*n2);//allocate memory of n2 size
   printf("Enter the elements of the array two ");
   for(int i=0;i<n2;i++){//enter elements into arrray b
       scanf("%d",&b[i]);
   }
   c = (int*) malloc((n1+n2) * sizeof(int));//allocate memory of size n1+n2
   uncommon_ele(a,n1,b,n2,c,&size);//now call function by passing ref
   printf("uncommon_elements are %d ",size);
   for(int i=0;i<(size);++i){//print the uncommon_elements
  
   printf("%d ",c[i]);
   }
   if(n1>0){//deallocate the memory allocated in heap
   free(a);
   }
   if(n2>0){
   free(b);
   }
   if(size>0){
   free(c);
   }
  
   return 0;
}

//output:

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