update new element in array C code example

Example: changing an item in an array in c

#include <stdio.h>
#define PI 3.142
int main(){
    int a[5] ={12, 21, 34, 23, 13};
    printf("Initial value of index 1: %d\n", a[1]);
    a[1] = 43;
    printf("Final value of index 1: %d\n", a[1]);
    
}