diff --git a/step_3.c b/step_3.c
new file mode 100644
index 0000000..e28b094
--- /dev/null
+++ b/step_3.c
@@ -0,0 +1,89 @@
+int main()
+{
+    printf("                              1.Input\n");
+    printf("                              2.Output\n");
+    printf("                              3.Order\n");
+    printf("                              4.Quit\n");
+    char c;
+    scanf("%c",&c);
+    if(c=='i'){printf("You are trying to Input info:\n");}
+    if(c=='o'){printf("You are trying to Output info");}
+    if(c=='m'){printf("You are trying to Make things ordered");}
+    if(c=='q'){printf("You are about to Quit");}
+    if(c!='i'&&c!='o'&&c!='m'&&c!='q'){printf("Wrong input");}
+struct student{
+    int study;
+    float math;
+    float physics;
+    float English;
+    float all;
+}student1,student2,student3;
+if(c=='i'){
+    scanf("%d%f%f%f ",&student1.study,&student1.math,&student1.physics,&student1.English);
+scanf("%d%f%f%f ",&student2.study,&student2.math,&student2.physics,&student2.English);
+scanf("%d%f%f%f",&student3.study,&student3.math,&student3.physics,&student3.English);}
+student1.all=student1.math+student1.physics+student1.English;
+student2.all=student2.math+student2.physics+student2.English;
+student3.all=student3.math+student3.physics+student3.English;
+float*s1;float*s2;float*s3;
+s1=&student1.all;
+s2=&student2.all;
+s3=&student3.all;
+float ping=(*s1+*s2+*s3)/3;
+float two;
+float max(float*k1,float*k2,float*k3);//比较三者
+float max2(float*k1,float*k2);//比较二者
+float z=max(s1,s2,s3);
+if(z==*s1){
+ printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student1.study,student1.all,ping,student1.math,student1.physics,student1.English);
+ two=max2(s2,s3);
+ if(two==*s2){
+     printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student2.study,student2.all,ping,student2.math,student2.physics,student2.English);
+     printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student3.study,student3.all,ping,student3.math,student3.physics,student3.English);
+ }
+ else{
+      printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student3.study,student3.all,ping,student3.math,student3.physics,student3.English);
+      printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student2.study,student2.all,ping,student2.math,student2.physics,student2.English);
+};
+}
+if(z==*s2){
+     printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student2.study,student2.all,ping,student2.math,student2.physics,student2.English);
+     two=max2(s1,s3);
+     if(two==*s1){
+          printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student1.study,student1.all,ping,student1.math,student1.physics,student1.English);
+          printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student3.study,student3.all,ping,student3.math,student3.physics,student3.English);
+     }
+     else{
+          printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student3.study,student3.all,ping,student3.math,student3.physics,student3.English);
+           printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student1.study,student1.all,ping,student1.math,student1.physics,student1.English);
+     };
+}
+if(z==*s3){
+     printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student3.study,student3.all,ping,student3.math,student3.physics,student3.English);
+     two=max2(s2,s1);
+     if(two==*s1){
+         printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student1.study,student1.all,ping,student1.math,student1.physics,student1.English);
+         printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student2.study,student2.all,ping,student2.math,student2.physics,student2.English);
+     }
+     else{
+         printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student2.study,student2.all,ping,student2.math,student2.physics,student2.English);
+          printf("%d,%2.1f,%2.1f,%2.1f,%2.1f,%2.1f\n",student1.study,student1.all,ping,student1.math,student1.physics,student1.English);
+     };
+}
+return 0;
+}
+ float max(float*k1,float*k2,float*k3)
+{
+    float l;
+    if(*k1>*k2&&*k1>*k3){l=*k1;}
+    if(*k2>*k3&&*k2>*k1){l=*k2;}
+    if(*k3>*k1&&*k3>*k2){l=*k3;}
+    return(l);
+}
+float max2(float *k1,float *k2)
+{
+    float l;
+    if(*k1>*k2){l=*k1;}
+    if(*k2>*k1){l=*k2;}
+    return(l);
+}
\ No newline at end of file