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Solve day 1 part 1

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Robbe Van Herck 2020-01-02 12:32:50 +01:00
parent 7b91b68403
commit d4e6d767aa
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GPG key ID: A66F76F7B81BD784
1 changed files with 43 additions and 12 deletions
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55
kernel/kernel.c
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@ -109,22 +109,53 @@ void terminal_writestring(const char* data)
{
terminal_write(data, strlen(data));
}
char* itoa(int value, char* result, int base) {
// check that the base if valid
if (base < 2 || base > 36) { *result = '\0'; return result; }
char* ptr = result, *ptr1 = result, tmp_char;
int tmp_value;
do {
tmp_value = value;
value /= base;
*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)];
} while ( value );
// Apply negative sign
if (tmp_value < 0) *ptr++ = '-';
*ptr-- = '\0';
while(ptr1 < ptr) {
tmp_char = *ptr;
*ptr--= *ptr1;
*ptr1++ = tmp_char;
}
return result;
}
void terminal_writeint(const int data) {
char result[10];
terminal_writestring(itoa(data, result, 10));
}
void kernel_main(void)
{
int input[] = {
106404,140515,142745,120767,79665,54235,127391,72207,70799,79485,103994,129583,132791,95135,121194,129425,64861,123233,132805,87916,111395,126625,113045,61704,65413,145820,75988,74717,115137,85331,86833,86063,85464,139738,103372,101942,52741,77660,112745,103109,106301,141714,74546,55474,106747,140234,60426,145867,144810,94179,101606,77763,139291,104246,148513,126828,64624,139058,85839,86636,62198,137358,76711,87848,141711,114079,71639,95896,104522,61929,72199,142790,137736,123437,91872,127661,111179,51548,83452,91196,117798,84484,75517,83820,97407,89181,71428,72758,73076,109957,50601,74571,65556,129765,80626,126995,73480,71360,103288,85670,0
};
/* Initialize terminal interface */
terminal_initialize();
terminal_putchar('H');
terminal_putchar('e');
terminal_putchar('l');
terminal_putchar('l');
terminal_putchar('o');
/* Newline support is left as an exercise. */
terminal_setcolor(vga_entry_color(VGA_COLOR_GREEN, VGA_COLOR_BLACK));
terminal_writestring(" kernel");
terminal_setcolor(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
terminal_writestring(" World!\n");
terminal_writestring("Newlines!");
int sum = 0;
int num;
int i = 0;
while ((num = input[i++]) != 0) {
sum += (num / 3) - 2;
}
terminal_writestring("result = ");
terminal_writeint(sum);
}