修正了一下错误

9_4.c

-#include <stdio.h>
-
-void moveLeft(int *a, int n)
-{
-    int *p = &a[n-1],b = a[n-1];
-    while(p != a)
-    {
-        int t;
-        t = b;
-        b = *(p-1);
-        *(p---1) = t;
-    }
-    a[n-1] = b;
-}
-void rotateLeft(int *a, int n, int k)
-{
-    int i;
-    for(i = 0; i < k; i++) moveLeft(a,n);
-}
-int main()
-{
-    int a[]={ 2, 3, 4, 5, 6, 7, 8, 9 };
-    int i, k;
-    printf("input k please: \n");
-    scanf("%d",&k);
-    for(i = 0; i < 8; i++) printf("%d\t",a[i]);
-    printf("\n");
-    rotateLeft(a,8,k);
-    for(i = 0; i < 8; i++) printf("%d\t",a[i]);
+#include <stdio.h>
+
+void moveLeft(int *a, int n)
+{
+    int *p = &a[n-1],b = a[n-1];
+    while(p != a)
+    {
+        int t;
+        t = b;
+        b = *(p-1);
+        *(p---1) = t;
+    }
+    a[n-1] = b;
+}
+void rotateLeft(int *a, int n, int k)
+{
+    int i;
+    for(i = 0; i < k; i++) moveLeft(a,n);
+}
+int main()
+{
+    int a[]={ 2, 3, 4, 5, 6, 7, 8, 9 };
+    int i, k;
+    printf("input k please: \n");
+    scanf("%d",&k);
+    for(i = 0; i < 8; i++) printf("%d\t",a[i]);
+    printf("\n");
+    rotateLeft(a,8,k);
+    for(i = 0; i < 8; i++) printf("%d\t",a[i]);
+    return 0;
 }
\ No newline at end of file

9_5.c

-#include <stdio.h>
-
-void statistic( int *a, int n, int *posinum_ptr, int *neganum_ptr)
-{
-    int *p = a;
-    while(p != a+n)
-    {
-        if(*p > 0) (*posinum_ptr)++;
-        if(*p < 0) (*neganum_ptr)++;
-        p++;
-    }
-    
-}
-int main()
-{
-    int a[10];
-    int i,posi_num,nega_num;
-    for(i=0; i<10; i++) scanf("%d", &a[i]);
-    statistic(a, 10, &posi_num, &nega_num);
-    printf("posi_num: %d, nega_num: %d",posi_num,nega_num);
+#include <stdio.h>
+
+void statistic( int *a, int n, int *posinum_ptr, int *neganum_ptr)
+{
+    int *p = a;
+    while(p != a+n)
+    {
+        if(*p > 0) (*posinum_ptr)++;
+        if(*p < 0) (*neganum_ptr)++;
+        p++;
+    }
+    
+}
+int main()
+{
+    int a[10];
+    int i,posi_num = 0,nega_num = 0;
+    for(i=0; i<10; i++) scanf("%d", &a[i]);
+    statistic(a, 10, &posi_num, &nega_num);
+    printf("posi_num: %d, nega_num: %d",posi_num,nega_num);
+    return 0;
 }
\ No newline at end of file