Here is the C program to count duplicate elements in an array.
Required Knowledge
Algorithm to count duplicate elements in an array
Let inputArray is an integer array having N elements.
Let inputArray is an integer array having N elements.
- For every element inputArray[i], where (0<=i<=N-1). Search for it's duplicate element from index i+1 to N-1.
- If duplicate element found, increment the counter and stop searching further for inputArray[i].
C program to find count of duplicate elements in an array
#include <stdio.h>
int main() {
int inputArray[100];
int i, j, elementCount, count = 0;
printf("Enter Number of Elements in Array\n");
scanf("%d", &elementCount);
printf("Enter %d numbers\n", elementCount);
/* Read array elements */
for(i = 0; i < elementCount; i++){
scanf("%d", &inputArray[i]);
}
for(i = 0; i < elementCount ; i++) {
for(j = i+1; j < elementCount; j++) {
if(inputArray[i]==inputArray[j]) {
/* One Duplicate Element Found */
count++;
break;
}
}
}
printf("Duplicate Element Count : %d\n", count);
return 0;
}
Output
Enter Number of Elements in Array 8 Enter 8 numbers 1 2 3 4 1 2 3 4 Duplicate Element Count : 4
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