Test !

#include  
int main() { int a[] = {1, 2, 3, 4}; 
int sum = 0; for(int i = 0; i < 4; i++) { sum += a[i]; } 
printf("%d", sum); return 0; }

#include  
void solve() 
{ int a[] = {1, 2, 3, 4, 5}; 
int sum = 0; 
for(int i = 0; i < 5; i++) { if(i % 2 == 0) { sum += *(a + i); } else { sum -= *(a + i); } } 
printf("%d", sum); } int main() { solve(); return 0; }

#include  
int main() { int a = 3, b = 5; 
int t = a; a = b; b = t; 
printf("%d %d", a, b); return 0; }

#include  
int main() { int arr[] = { 10, 20, 30, 40, 50, 60 }; 
int size_arra = (arr, sizeof arr / sizeof *arr); 

printf("Number of elements in arr[]: %d", size_arra); }