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()

{

         char c1,c2;

         c1=197;

         c2=198;

         printf("c1=%c,c2=%c\n",c1,c2);

         printf("c1=%d,c2=%d\n",c1,c2);

         return 0;

}

#include<stdio.h>

#include<math.h>

void main()

{

         float x,y,z;

         int a;

         scanf("%f",&x);

         scanf("%f",&y);

    y=fabs(y);

    z=x+1/y;

         a=z;

         printf("%d\n",z);

         printf("%15.6f\n",z);

         printf("%e",z);

         return 0;

}