#include<stdio.h>

main()

{

int a=8;

int b=6;

printf("%d%dn",a,b);

}

#include<stdio.h>

main()

{

float m=1.86;

double n=1.55;

printf("%d%dn",m,n);

}

#include<stdio.h>

main()

{

 

 

char cl='D';

printf("%c--%dn",cl,cl);

}

#include<stdio.h>

main()

{

int a=8,b=9,c;

c=a,a=b,b=c;

printf("a=%dnb=%dn",a,b);

}

#include<stdio.h>

main()

{

int a=8,b=9,c;

printf("a=%dnb=%dn",a,b);

c=b;

b=a;

a=c;

printf("交换值后;na=%dnb=%dn",a,b);

}

#include<stdio.h>

main()

{

int length,perimeter,area;

int wide;

scanf("%d%d",&length,&wide);

perimeter=(length+wide)*2;

area=length*wide;

printf("perimeter=%dnarea=%dn",perimeter,area);

}