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#include <stdio.h>
int main() {
	int N;
	scanf("%d", &N);
	int sum1 = 0;
	for (int n = N; n > 0; n /= 2); // after execution of this loop n=0
	for(int i = 0; i < n; i++) sum1++; // does not executes sum1 = 0
	int sum2 = 0;
	for (int i = 0; i < N; i *= 2); // Infinite loop -- i always remains 0
	for (int j = 0; j < i; j++) sum2++; // doesn't executes. 	
}

prog.c: In function 'main':
prog.c:7:21: error: 'n' undeclared (first use in this function)
  for(int i = 0; i < n; i++) sum1++; // does not executes sum1 = 0
                     ^
prog.c:7:21: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:22: error: 'i' undeclared (first use in this function)
  for (int j = 0; j < i; j++) sum2++; // doesn't executes.  
                      ^

Standard output is empty