实验一

#include <stdio.h>
int main()
{
 int a,b,sum;
 a=123;
 b=456;
 sum=a+b;
 printf("sum is %d\n",sum);
 return 0;
}

#include<stdio.h>
int main ()
{
char c1,c2;
c1=97;
c2=98;
printf("c1=%c,c2=%c\n",c1,c2);
printf("c1=%d,c2=%d\n",c1,c2);
return 0;}

#include<stdio.h>
int main ()
{
float x,y,z;
scanf("%f,%f",&x,&y);
if(y<0)
 y=-y;
z=(x+1/y);
printf("%d\n%15.6f\n%e\n",(int)z,z,z);
while(1)
return 0;
}