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2-1-2.c

+#pragma warning(disable:4996)
+#include<stdio.h>
+#include<windows.h>
+#include<string.h>
+
+struct point {
+    int xpos;
+    int ypos;
+}Point;
+struct point* getStruct(struct point*);
+void output(struct point);
+void print(const struct point* p);
+
+int main()
+{
+    struct point y = { 2,4 };
+    getStruct(&y);
+    output(y);
+    output(*getStruct(&y));
+    *getStruct(&y) = (struct point){ 1,2 };
+}
+
+struct point* getStruct(struct point* p)
+{
+    scanf("%d", &p->xpos);
+    scanf("%d", &p->ypos);
+    printf("%d,%d\n", p->xpos, p->ypos);
+
+    return p;
+}
+void output(struct point p) {
+    printf("%d,%d\n", p.xpos, p.ypos);
+}
+
+void print(const struct point* p)
+{
+    print("%d,%d", p->xpos, p->ypos);
+}
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