#include <stdio.h>
main()
{
float c=3.1415926;
printf("%f,%9.4f,%-9.4f,%3f,%-3f\n",c,c,c,c,c);
}

#include <stdio.h>
main()
{int a,b,max;
printf("please input a,b:\n");
scanf("%d %d,",&a,&b);
max=a;
if(max<b)
max=b;
printf("×î´óµÄÊýÊÇ %d\n",max);
return 0;
}

#include <stdio.h>
main()
{
int a;
printf("请输入一个正整数\n");
scanf("%d",&a);
if(a%2==0)
printf("%d is even！！！\n",a);
else
printf("%d is odd！！！\n",a);
}