resort

Homework/SC/main.c

@@ -0,0 +1,61 @@
+#include "head.h"
+
+int main(int argc, char *argv[]) {
+  srand(time(0));
+  Stack *numbers = malloc(sizeof(Stack));
+  if (numbers == NULL)
+    exit(1);
+
+  char c;
+  char flag = 'f';
+
+  while ((c = getchar()) != EOF) {
+    if (c == '\n') {
+      break;
+    } else if (c == ' ') {
+      flag = 't';
+      continue;
+    }
+
+    switch (c) {
+    case '0' ... '9':
+      if (flag == 't') {
+        numbers = add_head(numbers, (double)(c - '0'));
+        flag = 'f';
+      } else {
+        double a = get(numbers, 0).x;
+        numbers = del_head(numbers);
+        a = a * 10 + c - '0';
+        numbers = add_head(numbers, a);
+      }
+      break;
+
+    case '+':
+    case '-':
+    case '*':
+    case '/':
+      if (len(numbers) < 2) {
+        printf("Invalid expression\n");
+        exit(2);
+      }
+
+      double a = get(numbers, 0).x;
+      numbers = del_head(numbers);
+      double b = get(numbers, 0).x;
+      numbers = del_head(numbers);
+
+      b = (c == '+') ? b + a : b;
+      b = (c == '-') ? b - a : b;
+      b = (c == '*') ? b * a : b;
+      b = (c == '/') ? b / a : b;
+
+      numbers = add_head(numbers, b);
+      break;
+    }
+  }
+
+  printf("result: %lF\n", get(numbers, 0).x);
+
+  free(numbers);
+  return 0;
+}