C Exercises: Array length, remove instances of a value

Last update on March 21 2025 12:37:17 (UTC/GMT +8 hours)

13. Remove Instances of a Given Value Variants

Write a C program to remove all instances of a given value from a given array of integers and return the length of the updated array.

C Code:

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

static int removeElement(int *nums, int arr_size, int val)
{
    int i, ctr = 0;
    for (i = 0; i < arr_size; i++) {
        if (nums[i] != val) {
            nums[ctr++] = nums[i];
        }
    }
    return ctr;
}

int main(void)
{
    int nums[] = {1,1,2,3,4,4,5,6,6,6};    
    int size = sizeof(nums)/sizeof(nums[0]);
    printf("Original array:\n");
    int i;
	int val = 4;
    for (i = 0; i < size; i++) {
        printf("%d ", nums[i]);
    }
    int new_size = removeElement(nums, size, val);
    printf("\nSize of the new array after removing the value 4: %d\n",new_size);
    return 0;
}

Sample Output:

Original array:
1 1 2 3 4 4 5 6 6 6 
Size of the new array after removing the value 4: 8

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to remove all occurrences of a specific value from an array and return the updated length.
• Write a C program to shift elements left in an array after removing all instances of a target value.
• Write a C program to remove a given value from an array without using extra space.
• Write a C program to remove a target value from an array and then sort the remaining elements.

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