From 244862feeaba215a86cffbf8c23f19b8a85209bf Mon Sep 17 00:00:00 2001
From: Atlas Cove <Atlas48@gmx.com>
Date: Sat, 7 May 2022 13:22:36 +0100
Subject: [PATCH] initial commit

---
 .gitignore |  6 ++++++
 add.c      | 25 +++++++++++++++++++++++++
 div.c      | 25 +++++++++++++++++++++++++
 mean.c     | 18 ++++++++++++++++++
 mul.c      | 25 +++++++++++++++++++++++++
 sub.c      | 25 +++++++++++++++++++++++++
 sum.c      | 17 +++++++++++++++++
 7 files changed, 141 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 add.c
 create mode 100644 div.c
 create mode 100644 mean.c
 create mode 100644 mul.c
 create mode 100644 sub.c
 create mode 100644 sum.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..df2a5f7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+add
+div
+mean
+mul
+sub
+sum
diff --git a/add.c b/add.c
new file mode 100644
index 0000000..1c4076e
--- /dev/null
+++ b/add.c
@@ -0,0 +1,25 @@
+#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 %d cannot be parsed as int", *argv);
+    return 1;
+  } else if(e2==EOF) {
+        eprintf("%s: argument %d cannot be parsed as int", *argv);
+    return 1;
+  }
+  out=v1+v2;
+  printf("%d\n",out);
+  return 0;
+}
diff --git a/div.c b/div.c
new file mode 100644
index 0000000..c7370a9
--- /dev/null
+++ b/div.c
@@ -0,0 +1,25 @@
+#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 %d cannot be parsed as int", *argv);
+    return 1;
+  } else if(e2==EOF) {
+        eprintf("%s: argument %d cannot be parsed as int", *argv);
+    return 1;
+  }
+  out=v1/v2;
+  printf("%d\n",out);
+  return 0;
+}
diff --git a/mean.c b/mean.c
new file mode 100644
index 0000000..99e81d4
--- /dev/null
+++ b/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;
+}
diff --git a/mul.c b/mul.c
new file mode 100644
index 0000000..bbe5733
--- /dev/null
+++ b/mul.c
@@ -0,0 +1,25 @@
+#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 %d cannot be parsed as int", *argv);
+    return 1;
+  } else if(e2==EOF) {
+        eprintf("%s: argument %d cannot be parsed as int", *argv);
+    return 1;
+  }
+  out=v1*v2;
+  printf("%d\n",out);
+  return 0;
+}
diff --git a/sub.c b/sub.c
new file mode 100644
index 0000000..e08bc46
--- /dev/null
+++ b/sub.c
@@ -0,0 +1,25 @@
+#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 %d cannot be parsed as int", *argv);
+    return 1;
+  } else if(e2==EOF) {
+        eprintf("%s: argument %d cannot be parsed as int", *argv);
+    return 1;
+  }
+  out=v1-v2;
+  printf("%d\n",out);
+  return 0;
+}
diff --git a/sum.c b/sum.c
new file mode 100644
index 0000000..7169d26
--- /dev/null
+++ b/sum.c
@@ -0,0 +1,17 @@
+#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, "sscanf error: not an integer.\n");
+      return 1;
+    }
+    acc+=buf;
+  }
+  printf("%d\n",acc);
+  return 0;
+}