这是我写的

#include <stdio.h>

main()

{

int a;

printf ("请输入一个数：");

scanf ("%d",&a);

   if (a>0)

   { printf (a="%d",a);}

   else {printf (a="%d",a);

}}

，下面显示0错误，0警告 ，程序也能运行出来  但是0错误，0警告上面还有这些，还需用管吗？

:\Personal\Desktop\blank1.c(8) : warning C4047: '=' : 'int ' differs in levels of indirection from 'char [3]'

D:\Personal\Desktop\blank1.c(8) : warning C4047: 'function' : 'const char *' differs in levels of indirection from 'int '

D:\Personal\Desktop\blank1.c(8) : warning C4024: 'printf' : different types for formal and actual parameter 1

D:\Personal\Desktop\blank1.c(9) : warning C4047: '=' : 'int ' differs in levels of indirection from 'char [3]'

D:\Personal\Desktop\blank1.c(9) : warning C4047: 'function' : 'const char *' differs in levels of indirection from 'int '

D:\Personal\Desktop\blank1.c(9) : warning C4024: 'printf' : different types for formal and actual parameter 1