In this article, we will show you, How to write a C Program to Print Unique Elements in an Array with example. Before going into this article Please refer Array in C article to understand the concept of Array size, index position etc.
C Program to Print Unique Elements in an Array Example 1
This program asks the user to enter Array Size, and array elements. Next, it is going to find out all the Unique elements (non-duplicate elements) present in this array using For Loop.
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/* C Program to Print Unique Elements in an Array */ #include <stdio.h> int main() { int arr[10], FreqArr[10], i, j, Count, Size; printf("\n Please Enter Number of elements in an array : "); scanf("%d", &Size); printf("\n Please Enter %d elements of an Array : ", Size); for (i = 0; i < Size; i++) { scanf("%d", &arr[i]); FreqArr[i] = -1; } for (i = 0; i < Size; i++) { Count = 1; for(j = i + 1; j < Size; j++) { if(arr[i] == arr[j]) { Count++; FreqArr[j] = 0; } } if(FreqArr[i] != 0) { FreqArr[i] = Count; } } printf("\n List of Unique Array Elemnts in this Array are : "); for (i = 0; i < Size; i++) { if(FreqArr[i] == 1) { printf("%d\t", arr[i]); } } return 0; } |
OUTPUT
TIP: We already explained the analysis part in our previous example. Please refer C Program to Count Frequency of each Element in an Array to understand the analysis.
C Program to Print Unique Elements in an Array Example 2
This is the different version of above program. Here we are using multiple if statements
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/* C Program to Print Unique Elements in an Array */ #include <stdio.h> int main() { int arr[10], i, j, k, isUnique, Size; printf("\n Please Enter Number of elements in an array : "); scanf("%d", &Size); printf("\n Please Enter %d elements of an Array : ", Size); for (i = 0; i < Size; i++) { scanf("%d", &arr[i]); } for (i = 0; i < Size; i++) { isUnique = 1; for(j = i + 1; j < Size; j++) { if(arr[i] == arr[j]) { for(k = j; k < Size; k++) { arr[k] = arr[k + 1]; } Size--; j--; isUnique = 0; } } if(isUnique != 1) { for(j = i; j < Size - 1; j++) { arr[j] = arr[j + 1]; } Size--; i--; } } printf("\n List of Unique Array Elemnts in this Array are : "); for (i = 0; i < Size; i++) { printf("%d\t", arr[i]); } return 0; } |
OUTPUT
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