1 #include<stdio.h> 
 2 #include<stdlib.h> 
 3 
 4 void main(){
 5     int num;
 6     scanf("%d",&num);
 7     printf("\n%d",num);
 8     printf("\n%ld",num);
 9     printf("\n%10d",num);//10位靠右
10     printf("\n%-10d",num);//10位靠左
11     printf("\n%010d",num);//10位，左边补0
12     printf("\n%5d",num);//5位，超过按照实际，不超过则靠右
13 
14     system("pause");
15 }

 1 #include<stdio.h> 
 2 #include<stdlib.h> 
 3 
 4 void main(){
 5     int num;
 6     char str0[30],str[50];
 7     scanf("%d%s",&num,str0);
 8     printf("num=%d,str0=%s",num,str0);
 9     sprintf(str,"for /l %%i in (1,1,%d) do %s",num,str0);
10     system(str);
11 
12     system("pause");
13 }

 1 #include<stdio.h>
 2 #include<windows.h>
 3 
 4 void main(){
 5     int x=10;
 6     int y=100000;
 7     printf("%x,%x",&x,&y);
 8     while(1){
 9         printf("\n阿飞有%d个妞，有%d元",x,y);
10         Sleep(1000);
11     }
12 }

1 _declspec(dllexport) void go(){
2     int *p=(int *)0x4dfcbc;
3     int *q;
4     *p=0;
5     q=(int *)0x4dfcb0;
6     *q=100;
7 }

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 
 4 void main(){
 5     char str[50],strurl[50];
 6     scanf("%s",str);
 7     sprintf(strurl,"%s",str);//实现字符串的赋值，因为字符串不能通过 str=strurl 赋值
 8     sprintf(strurl,"%.7s",str);//截取前面7个字符
 9     sprintf(strurl,"%10.7s",str);//10位宽，截取前面7个字符
10     system(strurl);
11     system("pause");
12 }