l1

Lesson/14.03/l1.c

@@ -0,0 +1,43 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<time.h>
+
+void swap(int a[], int c, int d, int n){
+    int temp;
+    if((c>=n) || (d>=n)) return;
+    temp = a[c];
+    a[c] = a[d];
+    a[d] = temp;
+}
+
+void pa(int a[], int n){
+    int i;
+    for(i=0;i<n;i++){
+        printf("a[%d] = %2d ", i, a[i]);
+    }
+    printf("\n");
+}
+
+void init(int *a, int n){
+    srand(time(NULL));
+    while(n--){
+        *(a++)=rand()%100;
+    }
+}
+
+int main2(int n){
+    int a[n];
+
+    init(a,n);
+    pa(a,n);
+    swap(a,1,4,n);
+    pa(a,n);
+    return 0;
+}
+
+int main(){
+    int alenght;
+    printf("input n = ");
+    scanf("%d", &alenght);
+    return main2(alenght);
+}