5 files changed, 176 insertions, 0 deletions

diff --git a/mat/euler/13/Makefile b/mat/euler/13/Makefile
new file mode 100644
index 0000000..b9e8f74
--- /dev/null
+++ b/mat/euler/13/Makefile
@@ -0,0 +1,2 @@
+default:
+	gcc -I. prog.c -lm
diff --git a/mat/euler/13/a.out b/mat/euler/13/a.out
new file mode 100755
index 0000000..614ead4
--- /dev/null
+++ b/mat/euler/13/a.out
diff --git a/mat/euler/13/dodaj.c b/mat/euler/13/dodaj.c
new file mode 100644
index 0000000..d1fbb59
--- /dev/null
+++ b/mat/euler/13/dodaj.c
@@ -0,0 +1,38 @@
+#pragma once
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+int dodaj (const char * c, char * d, long int a, long int b) {
+	unsigned long long int carry = 0; // carry je pri seštevanju vedno pozitiven
+	long int diff = b-a;
+	unsigned long long int dodajmo_tole = 0;
+	unsigned long long int temu = 0;
+	for (b = b-1; b >= 0; b--) {
+		if (b-diff >= 0) {
+			dodajmo_tole = c[b-diff] - '0';
+		} else {
+			dodajmo_tole = 0;
+		}
+		temu = d[b] - '0';
+		dodajmo_tole = dodajmo_tole + carry;
+		carry = 0;
+		if (temu + dodajmo_tole > 9) {
+			dodajmo_tole = (temu + dodajmo_tole) - 10;
+			temu = 0;
+			carry++;
+		}
+		d[b] = temu + dodajmo_tole + '0';
+	}
+	return 0;
+}
+#ifndef DISABLE_LIB_TESTS
+int main (int argc, char ** argv) {
+	char c[] = "37107287533902102798797998220837590246510135740250";
+	char d[] = "00000000000000000000000000000000000000000000000000000000000000000000000000000000000";
+	int a = strlen(c);
+	int b = strlen(d);
+	dodaj(c, d, a, b);
+	fprintf(stdout, "test: %s\n", d);
+	return 0;
+}
+#endif
diff --git a/mat/euler/13/prog.c b/mat/euler/13/prog.c
new file mode 100644
index 0000000..164e030
--- /dev/null
+++ b/mat/euler/13/prog.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h> // we don't need math, as long as we have string xD
+#include <string.h>
+#define ZACETNA_VELIKOST 128
+#define DISABLE_LIB_TESTS
+#include <dodaj.c>
+int main (int argc, char ** argv) {
+	fprintf(stderr, "program bere številke, ločene z LF, iz STDIN, ter jih sešteva.\n");
+	char c = fgetc(stdin);
+	char s[] = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000";
+	size_t l = strlen(s);
+	// at this point I should mention that the the time is finite.
+	size_t velikost_b = ZACETNA_VELIKOST;
+	char * b = malloc(sizeof(char)*velikost_b);
+	unsigned int p = 0; // zaPisanih znakov v Buffer
+	while (c != EOF) {
+		if (c - '0' >= 0 && c - '0' <= 9) {
+			if (p + 3 >= velikost_b - 3) { // off by one can't happen now xD
+				velikost_b = velikost_b * 2;
+				char * b = realloc(b, sizeof(char)*velikost_b);
+			}
+			b[p++] = c;
+		}
+		if (c == '\n') {
+			b[p] = '\0';
+			dodaj (b, s, p, l);
+			fprintf(stderr, "dodal %s in dobil %s.\n", b, s);
+			p = 0;
+		}
+		continue_while:
+		c = fgetc(stdin);
+	}
+	fprintf(stdout, "seštevek številk je %s\n", s);
+	return 0;
+}
diff --git a/mat/euler/13/stevilke.txt b/mat/euler/13/stevilke.txt
new file mode 100644
index 0000000..43b568e
--- /dev/null
+++ b/mat/euler/13/stevilke.txt
@@ -0,0 +1,100 @@
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