c语言实验一

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;
}

二：1：

#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;
}

2：

#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;
}

三：

#include<stdio.h>
#include<math.h>
int main()
{
 int x,y;
 double z,a;
 scanf("%d%d",&x,&y);
 z=(double)x+1/fabs((double)y);
 a=z;
 printf("%d\n",(int)z);
 printf("%.6lf\n",a);
 printf("%e\n",a);
 return 0;
}