内存分配函数举例

《内存分配函数举例》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、函数名:malloc功 能:内存分配函数用 法:void*malloc(unsignedsize);程序例:#include#include#include#includeintmain(void){  char*str;  /*allocatememoryforstring*/  /*Thiswillgenerateanerrorwhencompiling*/  /*withC++,usethenewoperatorinstead.*/  if((str=malloc(10))==NULL)  {     printf("Notenoughmemorytoallocatebuffer")

2、;     exit(1); /*terminateprogramifoutofmemory*/  }  /*copy"Hello"intostring*/  strcpy(str,"Hello");  /*displaystring*/  printf("Stringis%s",str);  /*freememory*/  free(str);  return0;}函数名:calloc功 能:分配主存储器用 法:void*calloc(size_tnelem,size_telsize);程序例:#include#includeintmain(void){  char*str=NULL; 

3、 /*allocatememoryforstring*/  str=calloc(10,sizeof(char));  /*copy"Hello"intostring*/  strcpy(str,"Hello");  /*displaystring*/  printf("Stringis%s",str);  /*freememory*/  free(str);  return0;}函数名:free功 能:释放已分配的块用 法:voidfree(void*ptr);程序例:#include#include#includeintmain(void){  char*str;  /*allocat

4、ememoryforstring*/  str=malloc(10);  /*copy"Hello"tostring*/  strcpy(str,"Hello");  /*displaystring*/  printf("Stringis%s",str);  /*freememory*/  free(str);  return0;}