final tests

test/array/bigint.c

@@ -0,0 +1,54 @@
+int printf(char* format, ...);
+int getchar();
+
+
+void read(int* a) {
+    a[0] = 0;
+    while (1) {
+        int c = getchar();
+        if (c == '\n' || c == -1) {
+            break;
+        }
+        if (c >= '0' && c <= '9') {
+            a[++a[0]] = c - '0';
+        }
+    }
+    for (int j = 1; j <= a[0] / 2; j++) {
+        int temp = a[j];
+        a[j] = a[a[0] - j + 1];
+        a[a[0] - j + 1] = temp;
+    }
+}
+
+void write(int* a) {
+    int n = a[0];
+    for (int i = n; i > 0; --i) {
+        printf("%d", a[i]);
+    }
+    printf("\n");
+}
+
+void add(int* a, int* b) {
+    int n = a[0] > b[0] ? a[0] : b[0];
+    int carry = 0;
+    for (int i = 1; i <= n; i++) {
+        int sum = a[i] + b[i] + carry;
+        a[i] = sum % 10;
+        carry = sum / 10;
+    }
+    if (carry) {
+        a[n + 1] = carry;
+        a[0] = n + 1;
+    } else {
+        a[0] = n;
+    }
+}
+
+int main() {
+    int a[100];
+    int b[100];
+    read(a);
+    read(b);
+    add(a, b);
+    write(a);
+}