Question

、编写一个使用指针的c函数，交换数组a和数组b中的对应元素。

Answer 1

#include<stdio.h>
#include<stdlib.h>

void ex(int *a, int *b, int n){
int i,tmp;
for (i=0;i<n;i++){
tmp=a[i];a[i]=b[i];b[i]=tmp;
}
}

void main()
{
int x[5]={1,2,3,4,5};
int y[5]={6,7,8,9,10};
int i,n=5;
ex(x,y,n);
printf("\n X: ");
for (i=0;i<n;i++)printf("%d ",x[i]);
printf("\n Y: ");
for (i=0;i<n;i++)printf("%d ",y[i]);
system("pause");
}

Answer 2

#include<stdio.h>
#include<stdlib.h>
void
ex(int
*a,
int
*b,
int
n){
int
i,tmp;
for
(i=0;i<n;i++){
tmp=a[i];a[i]=b[i];b[i]=tmp;
}
}
void
main()
{
int
x[5]={1,2,3,4,5};
int
y[5]={6,7,8,9,10};
int
i,n=5;
ex(x,y,n);
printf("\n
X:
");
for
(i=0;i<n;i++)printf("%d
",x[i]);
printf("\n
Y:
");
for
(i=0;i<n;i++)printf("%d
",y[i]);
system("pause");
}

Answer 3

#include<stdio.h>
void swaparray(int a[],int b[],int arraylen);
void main()
{
int a[]={1,3,5,7,9};
int b[]={2,4,6,8,10};
swaparray(a,b,5);
for (int i=0;i<5;i++)
{
printf("%d ",a[i]);
}
printf("\n");
for (int j=0;j<5;j++)
{
printf("%d ",b[j]);
}
printf("\n");

}
void swaparray(int a[],int b[],int arraylen)
{
int temp=0;
for (int i=0;i<arraylen;i++)
{
temp=a[i];
a[i]=b[i];
b[i]=temp;
}
}