GDB breakpoints confusion in CS50 IDE

Just if curious, my code:
#include <stdio.h>
#include <cs50.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

int main(void)
{
int height;
int i;
int spaces1;
int blocks1;
int spaces2;
int blocks2;


do
{
printf("Height: ");
height = GetInt();
if (height==0)
{
return 0;
}

}
while
(height < 0 || height > 23);

if (height == 1)
{
for (i=0; i<1;i++)
{
for (blocks1 = 0; blocks1 < 1; blocks1++)
{
printf("#");
}

printf(" ");

for (blocks2 = 0; blocks2 < 1; blocks2++)
{
printf("#");
}

printf("\n");
}
}



else
{
for (int a=1; a<height +1; a++)
{
for(spaces1 = 0; spaces1 < height-a; spaces1++)
{
printf(" ");
}

for (blocks1 = 0; blocks1 < a; blocks1++)
{
printf("#");
}

printf(" ");

for (blocks2 = 0; blocks2 < a; blocks2++)
{
printf("#");
}

for(spaces2 = 0; spaces2 < height - a; spaces2++)
{
printf(" ");
}

printf("\n");
}

}




}