diff --git a/步骤4.c b/步骤4.c
new file mode 100644
index 0000000..7b10c96
--- /dev/null
+++ b/步骤4.c
@@ -0,0 +1,91 @@
+#include<stdio.h>
+void sortexam(int b[],int f[],float c[],float d[],float e[],float g[],int h,int n)/*°à¼¶Äڳɼ¨ÅÅÐò*/
+{
+	int i,j;
+	int t=0;
+	float k=0;
+	for(i=h;i<=n;i++)/*ðÅÝ*/
+	for(j=h;j<=n-i;j++)
+	{
+		if(g[j]<g[j+1])
+		{
+		t=b[j];
+		b[j]=b[j+1];
+		b[j+1]=t;	
+		k=c[j];
+		c[j]=c[j+1];
+		c[j+1]=k;
+		k=d[j];
+		d[j]=d[j+1];
+		d[j+1]=k;
+		k=e[j];
+		e[j]=e[j+1];
+		e[j+1]=k;
+			k=g[j];
+		g[j]=g[j+1];
+		g[j+1]=k;
+		}
+	}
+}
+void sortclass(int b[],int f[],float c[],float d[],float e[],float g[],int n)/*°à¼¶ÅÅÐò³ÌÐò*/
+{
+	int i,j;
+	int t=0;
+	float k=0;
+	for(i=1;i<=n;i++)/*ðÅÝ*/
+	for(j=1;j<=n-i;j++)
+	{
+		if(f[j]>f[j+1])
+		{
+		t=f[j];/*½»»»*/
+		f[j]=f[j+1];
+		f[j+1]=t;
+		t=b[j];
+		b[j]=b[j+1];
+		b[j+1]=t;	
+		k=c[j];
+		c[j]=c[j+1];
+		c[j+1]=k;
+		k=d[j];
+		d[j]=d[j+1];
+		d[j+1]=k;
+		k=e[j];
+		e[j]=e[j+1];
+		e[j+1]=k;
+			k=g[j];
+		g[j]=g[j+1];
+		g[j+1]=k;
+		}
+	}
+}
+int main()
+{
+	int i;
+	int k;
+	int b[1001]={0,10001,10002,10003},f[1001]={0,11,12,11};/*°à¼¶*/
+	float c[1001]={0,99.5,77.9,92.5},d[1001]={0,88.5,56.5,99.0},e[1001]={0,89.5,87.5,60.5};
+	float g[1001]={0};/*×ܳɼ¨*/
+	int sign=0;/*񈬀*/
+	scanf("%d%d%f%f%f",&b[4],&f[4],&c[4],&d[4],&e[4]);
+	sign=b[4];
+	for(i=1;i<=4;i++)
+	g[i]=c[i]+d[i]+e[i];
+	sortclass(b,f,c,d,e,g,4);
+	k=1;/*Ç°¶Ë*/
+	for(i=1;i<=4;i++)
+	{
+	if(f[i+1]!=f[k])
+	{
+	sortexam(b,f,c,d,e,g,k,i);
+	k=i+1;
+}
+}
+for(i=1;i<=4;i++)
+{
+	printf("%d %d %.1f %.1f %.1f",b[i],f[i],c[i],d[i],e[i]);
+	if(b[i]==sign)
+	printf(" inserted");
+	printf("\n");
+}
+return 0;
+}