study c(vc中测试过)——基本变量，宏定义

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#include "stdafx.h"
#include <stdio.h>

extern void main_fileoper22();
int main(int argv,char* arg[]){
//命令行参数
while(argv-->0){
printf("%d=%s/n",argv,*arg++);
}

printf("start main....../n");
main_fileoper22();

return 0;
}

#include "stdafx.h"
#include <stdio.h>
#include <math.h>

/*数据类型长度，字符变量*/
int main_size()
{
int a = 0;
short b = 1;
short int c = 2;
int size = sizeof(a);
int size2 = sizeof(b);
printf("%d,%d/n",size,size2);

char ch1 = getchar();
putchar(ch1);

scanf("%d",&a);
printf("---%ld---",a);

return 0;
}

#include "stdafx.h"
#include <stdio.h>
#include <math.h>

/*数据类型，输入输出*/
double globalvar;
int main_basicvar(){
float a,b,c;
double s,area;
printf("%f,%f",a,globalvar);
scanf("%f %f %f",&a,&b,&c);
s = (a+b+c)/2.0;
area = sqrt(s*(s-a)*(s-b)*(s-c));
printf("%f",area);
return 0;
}

#include "stdafx.h"
#include <math.h>

#define SQUARE x*x*x
#if !defined(SQUARE)
#define SQUARE x*x
#else
#define SQUARE x*x*x*x
#endif

#define ARRAY char*
typedef char* ARRAY2;

/*预处理:宏定义，类型定义，文件包含，条件编译*/
int main_define(){
int x = 2;
printf("start....../n");
int a = 2*SQUARE;
printf("%d/n",a);

ARRAY array1,array2;
array1 = "ssss";
array2='d';
ARRAY2 array11,array22;
array11="wwww1";
array22="wwww2";
puts(array11);puts(array22);
return 0;
}