Question

How to insert an element in one dimensional int array in C

Answer 1

#include <stdio.h>

#define SIZE 10

int main(void)
{
	int arr[SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	
	int insert_idx, insert_num, i;
 
	insert_idx = 3;
	insert_num = 100;
	
	for (i = SIZE - 1; i >= insert_idx; i--) 
		 arr[i] = arr[i - 1];
 
	arr[insert_idx - 1] = insert_num;
 
	for (i = 0; i < SIZE; i++)
		printf("%d ", arr[i]);
 
    return 0;
}
  
    
/*
      
run:

1 2 100 3 4 5 6 7 8 9

*/

 

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Answer 2

#include <stdio.h>

#define SIZE 10

int main(void)
{
	int arr[SIZE] = { 1, 2, 3, 4, 5, 0, 0, 0, 0, 0 };
	
	int insert_idx, insert_num, i, last_idx;
 
	insert_idx = 3;
	insert_num = 100;
	last_idx = 4;
	
	for (i = last_idx + 1; i >= insert_idx; i--) 
		 arr[i] = arr[i - 1];
 
	arr[insert_idx - 1] = insert_num;
 
	for (i = 0; i < SIZE; i++)
		printf("%d ", arr[i]);
 
    return 0;
}
  
    
/*
      
run:

1 2 100 3 4 5 0 0 0 0

*/

 

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