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(){
 int x,y;
 double z,d;
scanf("%d,%d",&x,&y);
if(y<0) y=-y;
d=1/double(y);
z=x+d;
printf("%d\n",z);
printf("%.6lf\n",z);
printf("%e\n",z);
 return 0 ;
}