#include<stdio.h>
#include<stdbool.h>
#include<stdlib.h>
#include<string.h>
const size_t BUFFER_LEN=128;
const size_t NUM_P=100;
int main(void)
{
    char buffer[BUFFER_LEN];
    char *pS[NUM_P]={NULL};
    char *pbuffer=buffer;
    int i=0;
    printf("\nYou can enter up to %u message each up to %u characters.",NUM_P,BUFFER_LEN-1);
    for(i=0;i<NUM_P;i++)
    {
        pbuffer=buffer;
        printf("\nEnter %s message,or press Enter to end\n",i>0?"another":"a");
        while((pbuffer-buffer<BUFFER_LEN-1)&&((*pbuffer++=getchar())!='\n'));
        if((pbuffer-buffer)<2)
         break;
        if((pbuffer-buffer)==BUFFER_LEN&&*(pbuffer-1)!='\n')
        {
            printf("String too long - maximum %d characters allowed",BUFFER_LEN);
            i--;
            continue;
        }
        *(pbuffer-1)='\0';
        pS[i]=(char*)malloc(pbuffer-buffer);
        if(pS[i]==NULL)
        {
            printf("\nOut of memory - ending program.");
            return 1;
        }
        strcpy(pS[i],buffer);
    }
    printf("\nIn reverse order,the strings you entered are:\n");
    while(--i>=0)
    {
        printf("\n%s",pS[i]);
        free(pS[i]);
        pS[i]=NULL;
    }
    return 0;
}
运行的时候输出variable-sized object may not be initialized,尝试用#define定义常量也不行，用int定义变量也不行。求指点

直接用常数呢？你的编译器问题？

1. Code::Blocks不是编译器
2. "运行的时候输出variable-sized object may not be initialized" --- 到底是运行时，还是编译器时？
3. "尝试用#define定义常量也不行" --- 你是怎么用#define定义的？

code::blocks是IDE 不是编译器 这个IDE可以用的编译器很多 默认用的是gcc罢