实验1

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

#include<stdio.h>

int main()

{  

char c1,c2;

 c1=97;  

c2=98;

 printf("c1=%c,c2=%c ",c1,c2);

 printf("c1=%d,c2=%d ",c1,c2);  

return 0;

}

#include<stdio.h>

int main()

{

 char c1,c2;  

c1=197;

 c2=198;     

printf("c1=%c,c2=%c ",c1,c2);    

  printf("c1=%d,c2=%d ",c1,c2);

 return 0;

}

#include<stdio.h>

#include<math.h>

int main()

{

    double x,y,z;

         scanf("%lf%lf",&x,&y);

         z=x+1/fabs(y);

         printf("%15.6f ",z);

         printf("%d ",(int)z);

         printf("%e ",z);

         return 0;

 }