修改文件结构。

POP/05/Exercise02.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+    char operater;
+    int a = 0, b = 0, c = 0, d = 0;
+    double result;
+    scanf("%c %d %d %d %d", &operater, &a, &b, &c, &d);
+    if (b == 0 || d == 0 || (operater == '/' && c == 0)) {
+        printf("input error");
+    }
+    else {
+        switch (operater) {
+            case '+': result = (a/b)+(c/d); break;
+            case '-': result = (a/b)-(c/d); break;
+            case '*': result = (a/b)*(c/d); break;
+            case '/': result = (a/b)/(c/d); break;
+        }
+        printf("%lf", result);
+    }
+    return 0;
+}