initial commit

mean.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  int buf;
+  int acc;
+  int err;
+  for(int i=1;i<argc;i++) {
+    err=sscanf(argv[i], "%i", &buf);
+    if(err!=1) {
+      fprintf(stderr, "%s: arg #%d not an integer.\n",*argv,i);
+      return 1;
+    }
+    acc+=buf;
+  }
+  acc/=argc-1;
+  printf("%d\n",acc);
+  return 0;
+}