#include<stdio.h>

main()
{    int a=3;
    int func;
    void proc;
   
    proc();
    a=func();
    printf("This is a sample of c program. \n");
    return(0);
}
void proc()
{
    printf("Hello. \n");
}
int func()
{
    return(2);
}
(6) : error C2182: 'proc' : illegal use of type 'void'
(8) : error C2064: term does not evaluate to a function
(9) : error C2064: term does not evaluate to a function

int func;
 void proc;
函数声明是这样的么

#include<stdio.h>

main()
{    int a=3;
int func();//这样就好
void proc();//这样就好


proc();
a=func();
printf("This is a sample of c program. \n");
return(0);
}
void proc()
{
    printf("Hello. \n");
}
int func()
{
    return(2);
}

#include<stdio.h>

main()
{    int a=3;
int func();//这样就好
void proc();//这样就好


proc();
a=func();
printf("This is a sample of c program. \n");
return(0);
}
void proc()
{
    printf("Hello. \n");
}
int func()
{
    return(2);
}

函数声明少了对括号！

函数和变量的声明

这个知识点