C指针

原创于 2013-12-21 10:39:50 发布 · 521 阅读

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#c语言

本文展示了一个使用C语言编写的程序，通过指针操作演示了内存分配与释放的过程，并展示了如何通过指针进行变量间的数据操作。文章通过具体的代码示例解释了指针的概念及其在实际编程中的应用。

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

void fun(float *p3,float *p2,float *p1,float *s)
{
printf("var s address is %x\n",s);
printf("var p1 address is %x\n",p1);
printf("var p2 address is %x\n",p2);
printf("var p3 address is %x\n",p3);

s=(float *)malloc(1*sizeof( float));
printf("var s address is %x\n",s);

printf("p2 values %f\n",*(p2++));
printf("var p2 address is %x\n",p2);
printf("p2 values %f\n",*p2);
*s=*p1+*(p2++);
printf("var p1 address is %x\n",p1);
printf("var p2 address is %x\n",p2);
printf("var p3 address is %x\n",p3);

printf("%f\n",*p1);
printf("%f\n",*p1+*(p2++));
printf("%f\n",*s);
}
int main()
{
float a[2]= {1.1,2.2},b[2]= {10.0, 20.0},*s=a,c[2]={100.0,200.0};
printf("in the main function var s address is %x\n",s);
printf("in the main function var a address is %x\n",a);
printf("in the main function var b address is %x\n",b);
printf("in the main function var c address is %x\n",c);
fun(c,b,a,s);
printf("%f\n",*s);

}