elo

commit 4608f67a7c24ce9df226f10464043a21021bcd54
Author: Joakim <joakim@jnisse.xyz>
Date:   Sat, 13 Apr 2024 01:27:20 +0200

Initial Commit, supports rating change for given k-factor for one game.

Diffstat:
A
elo.c
 | 
59
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 59 insertions(+), 0 deletions(-)
diff --git a/elo.c b/elo.c
@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+int roof(int *x){
+if (*x<-400) return -400;
+else if (*x>400) return 400;
+return *x;
+}
+int main(int argc, char **argv)
+
+{
+	int c;
+	int myelo,opprating;
+	int kfactor = 20;
+	int diff;
+	float res;
+	char *mopt=0, *eopt=0,*ropt=0, *kopt=0;
+	while ((c= getopt(argc,argv,"m:e:r:k:")) != -1) {
+		
+		switch (c) {
+			case 'm':
+			mopt=optarg;
+			break;
+			case 'r':
+			ropt=optarg;
+			break;
+			case 'e':
+			eopt=optarg;
+			break;
+			case 'k':
+			kopt=optarg;
+			kfactor= strtol(kopt,NULL,10);
+			break;
+			default:
+			printf("%s\n", "Ajabaja" );
+		}
+	}
+	myelo= strtol(eopt,NULL,10);
+	opprating= strtol(mopt,NULL,10);
+	res = strtof(ropt,NULL);
+	diff = myelo - opprating;
+	diff = roof(&diff);
+	const int caps[41] = {7,14,21,29,36,43,50,57,65,72,80,87,95,102,110,117,125,133,141,149,158,166,175,184,193,202,211,220,230,240,251,262,273,284,296,309,322,336,351,366,383};
+	int offset=0;
+	int p=50;
+	if (diff < 0) {
+	offset =100;
+		diff = -diff;
+	}
+	for (int i=0;i<41;++i) {
+		if (diff >= caps[i])
+		{p++;}
+
+	}
+	p++;	
+	if (offset){ p = offset -p;}
+	printf("%3.2f\n", (float)kfactor*(100*res-p)/100);
+	exit(0);
+}