linux下 C程序 参数和内存
#include <stdio.h>
int main(argc, argv)
int argc;char *argv[];
{
printf("argc=%d \n",argc);
int i;
for(i=0;i<argc;i++)
{
printf("argv[%d]=%s \n",i,argv[i]);
}
char arr1[]="i think is boring";
printf("strlen arr=%d\n",strlen(arr1));/*17*/
printf("sizeof arr=%d\n",sizeof(arr1));/*18*/
char *pointer=NULL;
pointer=(char *)malloc(1000);
printf("malloc strlen pointer=%d\n",strlen(pointer));/*0*/
printf("malloc sizeof pointer=%d\n",sizeof(pointer));/*4*/
memset(pointer,0,1000);
printf("memset strlen pointer=%d\n",strlen(pointer));/*0*/
printf("memset sizeof pointer=%d\n",sizeof(pointer));/*4*/
memcpy(pointer,arr1,strlen(arr1));
printf("memcpy arr1 to pointer=%s\n",pointer);/*i think is boring*/
printf("memcpy strlen pointer=%d\n",strlen(pointer));/*17*/
printf("memcpy sizeof pointer=%d\n",sizeof(pointer));/*4*/
if(pointer!=NULL)
{
free(pointer);
pointer=NULL;
}
return 0;
}
