求一个C语言程序题：编写一个函数SWAP（）实现交换两个数位置的功能 编写c语言程序，实现交换两个变量值的操作。
C\u8bed\u8a00\u7f16\u7a0b\u9898\uff1a\u7f16\u5199\u7a0b\u5e8f\u5b9e\u73b0\u4e24\u4e2a\u6574\u6570\u503c\u7684\u4ea4\u6362\uff0c\u5176\u4e2dswap()\u4e3a\u4ea4\u6362\u51fd\u6570\u3002(\u8981\u6c42\uff1a\u4e24\u503c\u771f\u6b63\u4ea4\u6362)#include "stdio.h"
int swap(int *p,int *q)
{
int t;
t=*p;*p=*q;*q=t;
}
main()
{
int a,b;
scanf("%d,%d",&a,&b);
swap(&a,&b);
printf("%d\n%d\n",a,b);
}
/*
\u7f16\u5199c\u8bed\u8a00\u7a0b\u5e8f\uff0c\u5b9e\u73b0\u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf\u503c\u7684\u64cd\u4f5c\u3002
\u8981\u6c42\uff1a\u4f7f\u7528\u5f62\u53c2\u4e3a\u6307\u9488\u7684\u51fd\u6570swap\u5b8c\u6210\u4ea4\u6362\u529f\u80fd\u3002
\u4e3b\u51fd\u6570\u4e2d\uff0c\u4f7f\u7528\u6574\u578b\u6307\u9488\u4ece\u952e\u76d8\u8f93\u5165\u4e24\u4e2a\u6574\u6570\uff0c\u901a\u8fc7\u8c03\u7528swap\u5b8c\u6210\u4ea4\u6362
\u8f93\u51fa\u4ea4\u6362\u524d\u540e\u7684\u53d8\u91cf\u503c\u8fdb\u884c\u6bd4\u8f83\u3002
\u8f93\u5165\u8f93\u51fa\u793a\u4f8b\uff1a
Input two number\uff1a3 4
Before change\uff1aa=3\uff0cb=4
After change:a=4,b=3
*/
//File: swap.c
#include
#include
void swap(int *a, int *b)
{
int tmp;
tmp=*a;
*a=*b;
*b=tmp;
}
int main()
{
int *a=NULL,*b=NULL;
a=(int *)calloc(1,sizeof(int));
if(!a)
{
perror("calloc a err.");
}
b=(int *)calloc(1,sizeof(int));
if(!b)
{
perror("calloc b err.");
}
printf("Input two number\uff1a");
scanf("%d %d",a,b);
printf("Before change\uff1aa=%d\uff0cb=%d\n",*a,*b);
swap(a,b);
printf("After change:a=%d\uff0cb=%d\n",*a,*b);
return 0;
}
C:\mypro>gcc -g -Wall swap.c -o swap
C:\mypro>swap
Input two number\uff1a3 4
Before change\uff1aa=3\uff0cb=4
After change:a=4\uff0cb=3
C:\mypro>
\u7a0b\u5e8f\u5df2\u8c03\u597d\uff0c\u76f4\u63a5\u8fd0\u884c\u5373\u53ef\u3002
void swap(int *p, int *q);//用传地址的方法交换
void main()
{
int i, j;
scanf("%d%d", &i, &j);//从键盘输入两个交换的数
swap(&i, &j);//传入i，j的地址
printf("i = %d, j = %d\n", i, j);//输出交换后的两个值
}
void swap(int *p, int *q)
{
int temp;//定义临时变量 存放中间值
temp = *p;
*p = *q;
*q = temp;
}
注意：不能直接写void swap(int i, int j);
因为那只是临时变量，函数调用完后，便释放空间，两个值并没有交换。
/*交换程序*/
#include <iostream>
using namespace std;
void swap(int &x,int &y);
int main()
{
int i=8,j=9;
swap(i,j);
cout <<"i=" <<i <<endl;
cout <<"j=" <<j <<endl;
return 0;
}
void swap(int &x,int &y)
{
int temp;
temp=x;
x=y;
y=temp;
cout<<"This swap is used!"<<endl; //判断该函数是否被调用
}
/*传引用调用，改变了实参的值，所以得以交换*/
#include <iostream>
using namespace std;
void swap(int &x,int &y);函数声明
/*传引用(就是用&号的原因)调用，改变了实参的值，所以得以交换*/
int main()
{
int i=8,j=9;
swap(i,j); //函数调用
cout <<"i=" <<i <<endl;
cout <<"j=" <<j <<endl;
return 0;
}
void swap(int &x,int &y)
{
int temp;
temp=x;
x=y;
y=temp; //数值交换
cout<<"This swap is used!"<<endl; //判断该函数是否被调用
}
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