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

/*void fen_ge(const char ming_ling[], char jie_guo[]){
    const char * p_zi_fu = ming_ling;
    int ge_shu = 0;  //已经转移的字符个数
    //沿前一个参数的数组从前到后寻找字符 ' '
    //如果当前字符不是空格就转移
    while(' ' != *p_zi_fu){
        jie_guo[ge_shu] = *p_zi_fu;
        p_zi_fu++;
        ge_shu++;
    }
    jie_guo[ge_shu] = '\0';
}*/

void fen_ge(const char ming_ling[], char **pp_jie_guo){
    const char * p_zi_fu = ming_ling;
    while(' ' != *p_zi_fu){
        p_zi_fu++;
    }
    *pp_jie_guo = malloc((p_zi_fu - ming_ling + 1) * sizeof(char));
    if(*pp_jie_guo){
        p_zi_fu = ming_ling;
        int ge_shu = 0;
        while(' ' != *p_zi_fu){
            *(*pp_jie_guo + ge_shu) = *p_zi_fu;
            p_zi_fu++;
            ge_shu++;
        }
        *(*pp_jie_guo + ge_shu) = '\0';
    }
}
int main() {
    char ming_ling[] = "abc def xyz";
    /*char jie_guo[20];
    fen_ge(ming_ling, jie_guo);*/
    char *p_zi_fu =NULL;
    fen_ge(ming_ling, &p_zi_fu);
    //printf("jie_guo是%s\n",jie_guo);
    printf("jie_guo是%s\n",p_zi_fu);
    free(p_zi_fu);
    return 0;
}

--------------------Configuration: 29whl - Win32 Debug--------------------
Compiling...
29whl.c
G:\C语言编程\WHL\29whl\29whl.c(25) : error C2143: syntax error : missing ';' before 'type'
G:\C语言编程\WHL\29whl\29whl.c(27) : error C2065: 'ge_shu' : undeclared identifier
Error executing cl.exe.

29whl.exe - 2 error(s), 0 warning(s)

1.将   *pp_jie_guo =(char *) malloc((p_zi_fu - ming_ling + 1) * sizeof(char));  改为   *pp_jie_guo =(char *) malloc((p_zi_fu - ming_ling + 1) * sizeof(char));
2.将你的代码所在文件夹的后缀名由.c 改为 .cpp

.cpp不是c++的后缀吗？我学的是c语言

不改后缀名的话，就将你第 25 行的的语句放到函数的首部去。
c语言的定义一般都放于首部，不放首部是c++中的语法

谢谢