[Sync Iteration] c/wordy/1

solutions/c/wordy/1/wordy.c

@@ -0,0 +1,101 @@
+#include "wordy.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static inline char get_op(const char *token);
+static inline int calculate(int n1, int n2, char op, bool *error);
+
+bool answer(const char *question, int *result){
+    if (!question || !result) return false;
+
+    size_t len = strlen(question);
+
+    if (len < sizeof("What is _?") - 1) return false;
+
+    int n1 = 0;
+    int n2 = 0;
+    char op = 0;
+
+    char *q = malloc(len + 1);
+    if (!q) return false;
+
+    memcpy(q, question, len + 1);
+
+    char delims[] = {' ', '?'};
+    char *token = strtok(q, delims);
+
+    if (strcmp(token, "What") != 0) goto FAIL;
+    token = strtok(NULL, delims);
+    if (strcmp(token, "is") != 0) goto FAIL;
+
+    token = strtok(NULL, delims);
+    if (sscanf(token, "%d", &n1) == 0) goto FAIL;
+
+    bool error = false;
+    do {
+        token = strtok(NULL, delims);
+        if (!token) break;
+        op = get_op(token);
+        if (!op) goto FAIL;
+
+        if (op == '*' || op == '/') {
+            token = strtok(NULL, delims);
+            if (!token || strcmp(token, "by") != 0) goto FAIL;
+        }
+
+        token = strtok(NULL, delims);
+        if (!token) goto FAIL;
+        if (sscanf(token, "%d", &n2) == 0) goto FAIL;
+
+        n1 = calculate(n1, n2, op, &error);
+        if (error) goto FAIL;
+    } while(token);
+
+    free(q);
+    *result = n1;
+    return true;
+FAIL:
+    free(q);
+    return false;
+}
+
+static inline int calculate(int n1, int n2, char op, bool *error){
+    *error = false;
+    switch (op) {
+        case '+':
+            return n1 + n2;
+        case '-':
+            return n1 - n2;
+        case '*':
+            return n1 * n2;
+        case '/':
+            if (n2 != 0) return n1 / n2;
+            else {*error = true; return 0;}
+        default:
+            *error = true;
+            return 0;
+    }
+}
+
+static inline char get_op(const char *token) {
+    if (!token || !token[0]) return '\0';
+
+    switch (token[0]) {
+        case 'p':
+            if (strcmp(token, "plus") == 0) return '+';
+            break;
+        case 'm':
+            if (token[1] == 'i') {
+                if (strcmp(token, "minus") == 0) return '-';
+            } else if (token[1] == 'u') {
+                if (strcmp(token, "multiplied") == 0) return '*';
+            }
+            break;
+        case 'd':
+            if (strcmp(token, "divided") == 0) return '/';
+            break;
+    }
+    return '\0';
+}

solutions/c/wordy/1/wordy.h

@@ -0,0 +1,8 @@
+#ifndef WORDY_H
+#define WORDY_H
+
+#include <stdbool.h>
+
+bool answer(const char *question, int *result);
+
+#endif