实验一

#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()
{
 int a,b,sum;
 a=123;
 b=456;
 sum=a+b;
 printf("sum is %d\n",sum);
 return 0;
}#include<stdio.h>
int main()
{
 #include<stdio.h>
int main()
{
 int z1;
 double x,y,z2,z3;
 scanf("%lf%lf",&x,&y);
 if(y>=0)
  y=1/y;
 else
  y=-1/y;
 z1=x+y;
 z2=x+y;
 z3=x+y;
 printf("%d\n",z1);
 printf("%15.6f\n",z2);
 printf("%e\n",z3);
}