diff --git a/课设第二次.c b/课设第二次.c
new file mode 100644
index 0000000..39f3d33
--- /dev/null
+++ b/课设第二次.c
@@ -0,0 +1,116 @@
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+
+int question( int i)
+{
+	int a,b,j,m;
+	 
+	for( i = i;i<100;i++ ) 
+  { 
+    loop:
+	{
+		a=rand()%51;
+		b=rand()%51;//rand()%100±íʾȡ50ÒÔÄÚµÄËæ»úÊý
+		
+		j=rand()%2;//jµÄÖµ¾ö¶¨¼Ó¼õ·¨
+	}
+	 if(j==0)
+	 {
+		 m=a+b;
+		 if(m<=50)
+		 {
+			 printf("%d+%d=\n",a,b);
+		 }
+		 else
+			 goto loop;
+	 }
+
+	 else
+	 {
+		 m=a-b;
+		 if(m<=50&&m>=0)
+		 {
+			 printf("%d-%d=\n",a,b);
+		 }
+		 else
+			 goto loop;
+
+  } 
+	 break;
+}
+	return m;
+}
+
+int main() 
+{ 
+	int ordinal=1;
+	int modelanswer=0;
+	int studentanswer=0;
+	char str[20];
+	int grade=0;
+	int n;
+	
+   
+
+    printf("\n");
+    printf("============================================================\n");
+	printf("====================50ÒÔÄÚ¼Ó¼õ·¨¼ì²âϵͳ====================\n");
+    printf("============================================================\n");
+	printf("\n");
+
+	printf("ÇëÊäÈëÄãµÄÃû×Ö£º\n");
+	scanf("%s",str);
+	printf("\nÄãºÃѽ£¬%sСÅóÓÑ£¬»¶Ó­½øÈë50ÒÔÄÚ¼Ó¼õ·¨¼ì²âϵͳ¡£\n",str);
+	printf("ÿµÀÌâÄãÓÐÈý´Î´ðÌâ»ú»á£¬Èç¹ûÈý´Î»ú»á½áÊøÔòÖ±½Ó¸ø³öÕýÈ·´ð°¸¡£\n");
+	printf("\n²âÊÔ½áÊøºó»á¸ø³öÄãµÄ³É¼¨ÒÔ¼°ÏàÓ¦ÆÀ¼¶¡£\n");
+	printf("\n");
+	printf("======================ҪעÒâϸÐÄŶ~=========================\n\n");
+
+	for(n=1;n<11;n++)
+	{
+	printf("\nµÚ%dµÀÌ⣺\n",n);
+	modelanswer=question(n);
+	
+	printf("ÇëÊäÈë´ð°¸£º");
+	scanf("%d",&studentanswer);
+	if(studentanswer==modelanswer)
+	{
+		printf("»Ø´ðÕýÈ·£¬Çë¼ÌÐø¼ÓÓÍŶ¡£\n");
+		grade=grade+10;
+	}
+	else
+	{
+		printf("»Ø´ð´íÎó£¬ÇëºÃºÃ˼¿¼¡£Ä㻹ÓÐÁ½´Î»ú»á¡£\n");
+		printf("ÇëÊäÈë´ð°¸£º");
+		scanf("%d",&studentanswer);
+
+		if(studentanswer==modelanswer)
+		{
+			printf("»Ø´ðÕýÈ·£¬Çë¼ÌÐø¼ÓÓÍŶ¡£\n");
+			grade=grade+7;
+		}
+
+		else
+		{
+			printf("»Ø´ð´íÎó£¬ÇëºÃºÃ˼¿¼¡£Ä㻹ÓÐÒ»´Î»ú»á¡£\n");
+			printf("ÇëÊäÈë´ð°¸£º");
+			scanf("%d",&studentanswer);
+
+			if(studentanswer==modelanswer)
+			{
+				printf("»Ø´ðÕýÈ·£¬Çë¼ÌÐø¼ÓÓÍŶ¡£\n");
+				grade=grade+5;
+			}
+
+			else
+			{
+				printf("»Ø´ð´íÎó¡£ÕýÈ·´ð°¸ÊÇ£º%d\n",modelanswer);
+				grade=grade+0;
+			}
+		}
+		}
+	}
+
+	return 0;
+}
\ No newline at end of file
diff --git a/课设第二次.exe b/课设第二次.exe
new file mode 100644
index 0000000..79755d0
Binary files /dev/null and b/课设第二次.exe differ