1 files changed, 81 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..0c90732
--- /dev/null
+++ b/main.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Enums make words into numbers, ergo no magic numbers */
+enum MODE {
+  MODE_MAX,
+  MODE_MIN,
+  MODE_DIFF
+};
+
+void help(){
+    printf("Usage: stats <numbers>\n");
+    exit(1);
+}
+
+/* ADDING UP ALL THE VALUES */
+int sigma(int argc, char * argv[]) {
+  char *endptr;
+  int sum = 0;
+
+  for (int i = 1; i < argc; i++) {
+
+  sum += strtol(argv[i], &endptr, 10); /* convert the value to an integer and add it on */
+    if (endptr == argv[i] || *endptr != '\0') {
+        help();
+    } 
+
+  }
+  return sum;
+}
+
+/* FINDING MEAN */
+float average(int n, int sum) {
+  float mean = (float) sum / n;
+  return mean;
+}
+
+/* FINDING THE MIN/MAX/DIFFERENCE */
+int range(int argc, char * argv[], enum MODE mode) {
+  int low  = strtol(argv[1], NULL, 10);
+  int high = low; 
+
+  for (int i = 1; i < argc; i++) {
+    int val = strtol(argv[i], NULL, 10);
+    if (val > high) high = val;
+    if (low > val)  low  = val;
+  }
+
+  /* Check once and return what we need */
+  switch (mode) {
+    case MODE_MAX:
+      return high;
+    case MODE_MIN:
+      return low;
+    case MODE_DIFF:
+      return high - low;
+  }
+  return 1;
+}
+
+int main(int argc, char * argv[]) {
+  if (argc < 2) { /* Stop empty input */
+    help();
+  }
+
+  int n = argc - 1; /* this is how many numbers there are */
+  int sum = sigma(argc, argv); /* sigma means adding them all together */
+  float mean = average(n, sum); /* the sum divided by the however many numbers there are */
+  int min = range(argc, argv, MODE_MIN); /* Using enums here to use words instead of numbers */
+  int max = range(argc, argv, MODE_MAX);
+  int diff = range(argc, argv, MODE_DIFF);
+
+
+  /* align text left for 6 and 10 right */
+  printf("%-6s %10d\n",   "num:", n);
+  printf("%-6s %10d\n",   "sum:", sum);
+  printf("%-6s %10.3f\n", "mean:", mean);
+  printf("%-6s %10d\n",   "min:", min);
+  printf("%-6s %10d\n",   "max:", max);
+  printf("%-6s %10d\n",   "range:", diff);
+}