c - 错误赋值从整数生成指针而不进行强制转换[默认启用]

Question

我对 C 编程还很陌生。我在编译我的程序时遇到了这个错误。我试图在互联网上寻找解决方案，但无济于事。错误在行 num = rand()%20;

char* getParameter(char *name)
 {
   char *num;

   char *buffer;


   if(strcmp(name,"Trainingsprogramm")){
    srand (time(NULL));
     num = rand()%20;;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"Personnenummer")){
     srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"Tretzustand")){
     srand (time(NULL));
     srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"Tretleistung")){
     srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"Drehzahl")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"Geschwindigkeit")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"GefahreneDistanz")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"RealeKJoule")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"AktuellerPuls")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"MomentanerGang")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"RelaxBetrieb")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}else if(strcmp(name,"VerbrauchteKJoule")){srand (time(NULL));
      num = rand()%20;
    sprintf(buffer,"%d",num);
}

return buffer;

}

Answer 1

尝试从 num 的声明中删除星号。

char *num; // <<< This is a pointer to char declaration
char num; // <<< This is a char

int num; // <<< But this is probably what you meant/wanted!