程序如下
#include <stdio.h> char str[15]={'\0'}; struct in_addr { unsigned long int s_addr; }; char *inet_ntoa(struct in_addr in); int main() { struct in_addr addr0; char *s; addr0.s_addr=0x8002c2f2; s=inet_ntoa(addr0); printf("%s",s); return 0; } char *inet_ntoa(struct in_addr in) { unsigned long int x,temp; unsigned long int mask=0xff000000; char i,j,k=0,m,n,t; char *tp; x = in.s_addr; j=3;i=0;m=i; for(j=3;j>=0;j--) { temp = x & mask; temp = temp>>(j*8); mask>>=8; do { str[i]=temp%10+'0'; temp=temp/10; i++; }while(temp); if(k<3) { str[i]='.'; k++; } for(n=i-1; m<n; m++,n--) { t=str[m]; str[m]=str[n]; str[n]=t; } i++; m=i; } tp=str; return tp; } 运行结果：
128.2.194.242
