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2-1-1.c

+#include<stdio.h>
+#include<windows.h>
+#include<string.h>
+
+struct Person
+{
+    char name[20];
+    int age;
+}student[3] = { "Steve", 22, "Allen", 20, "Sun", 25 };
+
+int main()
+{
+    int i = 0, j = 0;
+    char student_name[20];
+    for (i = 0; i < 3; i++)
+    {
+        printf("please input the name of student:\n");
+        gets_s(student_name, 20);
+        for (j = 0; j < 3; j++)
+        {
+            if ((strcmp(student_name, student[j].name) == 0))
+            {
+                student[j].age++;
+            }
+        }
+    }
+    printf("\nResult:\n");
+    for (i = 0; i < 3; i++)
+    {
+        printf("%5s:%d\n", student[i].name, student[i].age);
+
+    }
+
+    system("pause");
+    return 0;
+}