added sum function to shellscript version

(less overhead overall)

Makefile

@@ -1,4 +1,5 @@
-files = add div mean mod mul sub sum
+#TODO: find way of installing shell library with make
+files = mean sum
 
 all: $(files)
 

add.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#ifndef eprintf
-#define eprintf(...) fprintf(stderr, __VA_ARGS__)
-#endif
-
-int main(int argc, char **argv) {
-  int v1;
-  int v2;
-  int out;
-  int e1;
-  int e2;
-
-  e1 = sscanf(argv[1], "%i", &v1);
-  e2 = sscanf(argv[2], "%i", &v2);
-  if(e1==EOF) {
-    eprintf("%s: argument 1 cannot be parsed as int", *argv);
-    return 1;
-  } else if(e2==EOF) {
-        eprintf("%s: argument 2 cannot be parsed as int", *argv);
-    return 1;
-  }
-  out=v1+v2;
-  printf("%d\n",out);
-  return 0;
-}

div.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#ifndef eprintf
-#define eprintf(...) fprintf(stderr, __VA_ARGS__)
-#endif
-
-int main(int argc, char **argv) {
-  int v1;
-  int v2;
-  int out;
-  int e1;
-  int e2;
-
-  e1 = sscanf(argv[1], "%i", &v1);
-  e2 = sscanf(argv[2], "%i", &v2);
-  if(e1==EOF) {
-    eprintf("%s: argument 1 cannot be parsed as int", *argv);
-    return 1;
-  } else if(e2==EOF) {
-        eprintf("%s: argument 2 cannot be parsed as int", *argv);
-    return 1;
-  }
-  out=v1/v2;
-  printf("%d\n",out);
-  return 0;
-}

mod.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#ifndef eprintf
-#define eprintf(...) fprintf(stderr, __VA_ARGS__)
-#endif
-
-int main(int argc, char **argv) {
-  int v1;
-  int v2;
-  int out;
-  int e1;
-  int e2;
-
-  e1 = sscanf(argv[1], "%i", &v1);
-  e2 = sscanf(argv[2], "%i", &v2);
-  if(e1==EOF) {
-    eprintf("%s: argument 1 cannot be parsed as int", *argv);
-    return 1;
-  } else if(e2==EOF) {
-        eprintf("%s: argument 2 cannot be parsed as int", *argv);
-    return 1;
-  }
-  out=v1%v2;
-  printf("%d\n",out);
-  return 0;
-}

mul.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#ifndef eprintf
-#define eprintf(...) fprintf(stderr, __VA_ARGS__)
-#endif
-
-int main(int argc, char **argv) {
-  int v1;
-  int v2;
-  int out;
-  int e1;
-  int e2;
-
-  e1 = sscanf(argv[1], "%i", &v1);
-  e2 = sscanf(argv[2], "%i", &v2);
-  if(e1==EOF) {
-    eprintf("%s: argument 1 cannot be parsed as int", *argv);
-    return 1;
-  } else if(e2==EOF) {
-        eprintf("%s: argument 2 cannot be parsed as int", *argv);
-    return 1;
-  }
-  out=v1*v2;
-  printf("%d\n",out);
-  return 0;
-}

shellmath.sh

@@ -0,0 +1,16 @@
+# Shellmath v2
+# Works in most bourne-type shells.
+# Partially reimplemented in shell script due to less overhead.
+
+function add { echo $(($1+$2)); }
+function sub { echo $(($1-$2)); }
+function mul { echo $(($1*$2)); }
+function div { echo $(($1/$2)); }
+function mdl { echo $(($1%$2)); }
+function randr { echo $(($1+$RANDOM%$2)); }
+function sum {
+  for i in $@; do
+	acc=$((acc+i))
+  done
+  echo $acc
+}

sub.c

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#ifndef eprintf
-#define eprintf(...) fprintf(stderr, __VA_ARGS__)
-#endif
-
-int main(int argc, char **argv) {
-  int v1;
-  int v2;
-  int out;
-  int e1;
-  int e2;
-
-  e1 = sscanf(argv[1], "%i", &v1);
-  e2 = sscanf(argv[2], "%i", &v2);
-  if(e1==EOF) {
-    eprintf("%s: argument 1 cannot be parsed as int", *argv);
-    return 1;
-  } else if(e2==EOF) {
-        eprintf("%s: argument 2 cannot be parsed as int", *argv);
-    return 1;
-  }
-  out=v1-v2;
-  printf("%d\n",out);
-  return 0;
-}