first commit

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表示取50以内的随机数
+		
+		j=rand()%2;//j的值决定加减法
+	}
+	 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("====================50以内加减法检测系统====================\n");
+    printf("============================================================\n");
+	printf("\n");
+
+	printf("请输入你的名字：\n");
+	scanf("%s",str);
+	printf("\n你好呀，%s小朋友，欢迎进入50以内加减法检测系统。\n",str);
+	printf("每道题你有三次答题机会，如果三次机会结束则直接给出正确答案。\n");
+	printf("\n测试结束后会给出你的成绩以及相应评级。\n");
+	printf("\n");
+	printf("======================要注意细心哦~=========================\n\n");
+
+	for(n=1;n<11;n++)
+	{
+	printf("\n第%d道题：\n",n);
+	modelanswer=question(n);
+	
+	printf("请输入答案：");
+	scanf("%d",&studentanswer);
+	if(studentanswer==modelanswer)
+	{
+		printf("回答正确，请继续加油哦。\n");
+		grade=grade+10;
+	}
+	else
+	{
+		printf("回答错误，请好好思考。你还有两次机会。\n");
+		printf("请输入答案：");
+		scanf("%d",&studentanswer);
+
+		if(studentanswer==modelanswer)
+		{
+			printf("回答正确，请继续加油哦。\n");
+			grade=grade+7;
+		}
+
+		else
+		{
+			printf("回答错误，请好好思考。你还有一次机会。\n");
+			printf("请输入答案：");
+			scanf("%d",&studentanswer);
+
+			if(studentanswer==modelanswer)
+			{
+				printf("回答正确，请继续加油哦。\n");
+				grade=grade+5;
+			}
+
+			else
+			{
+				printf("回答错误。正确答案是：%d\n",modelanswer);
+				grade=grade+0;
+			}
+		}
+		}
+	}
+
+	return 0;
+}