From b35930f9c55928361b96e762a32ba94e67a1a855 Mon Sep 17 00:00:00 2001
From: lukazieg <2003lukas.zie@gmail.com>
Date: Sat, 3 Feb 2024 11:24:06 +0100
Subject: [PATCH] added testForNumber.c

---
 src/main/c/testForNumber.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/main/c/testForNumber.c

diff --git a/src/main/c/testForNumber.c b/src/main/c/testForNumber.c
new file mode 100644
index 0000000..89784ed
--- /dev/null
+++ b/src/main/c/testForNumber.c
@@ -0,0 +1,23 @@
+double testForNumber() {
+    double num;
+    char storage[25];
+    char* notANumber;
+
+    do {
+        //Emptys the standart output buffer to ensure that this function works in loops
+        //and returns the value of num after every loop
+        fflush(stdout);
+
+        //fgets() reads the user input into the buffer storage (storage)
+        //the if condition is true as long as the input isn't empty
+        if (fgets(storage, sizeof storage, stdin) != NULL) {
+            //strtod() tries to convert the input into a double
+            //if there is anything but a number at any point of the array the pointer notANumber will point to this position
+            num = strtod(storage, &notANumber);
+        }
+        //isspace makes sure that notANumber doesn't point to an empty space
+        //the secount part makes sure that notANumber isn't pointing at 0
+    } while (!isspace(*notANumber) && *notANumber != 0);
+
+    return num;
+}
\ No newline at end of file