diff --git a/step3.cpp b/step3.cpp
new file mode 100644
index 0000000..43df14b
--- /dev/null
+++ b/step3.cpp
@@ -0,0 +1,36 @@
+#include<stdio.h>
+int main(){
+	printf("							  1.Input\n");
+	printf("							  2.Output\n");
+	printf("							  3.Order\n");
+	printf("							  4.Quit\n");
+	char a;
+	scanf("%c",&a);
+	if(a=='i'){
+		printf("Please input info of the three students:\n");
+	}else if(a=='o'){
+		printf("You are trying to Output info\n");
+	}else if(a=='m'){
+		printf("You are trying to Make things ordered\n");
+	}else if(a=='q'){
+		printf("You are about to Quit\n");
+	}else{
+		printf("Wrong input"); 
+	}
+	float num[3][4];
+	for(int i=0;i<3;i++){
+		for(int j=0;j<4;j++){
+			scanf("%f",&num[i][j]);
+		}
+	}
+	for(int i=0;i<3;i++){
+		float sum;
+		for(int j=1;j<4;j++){
+			sum+=num[i][j];
+			if(j==3){
+				printf("%.0f,%.1f,%.1f\n",num[i][0],sum,sum/3);
+				sum=0;
+			}
+		}
+	}
+}