实验一

1.

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

2.

#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;
}

3.

#include<stdio.h>
int main(){
 double x,y;
 int z1;
 double z2;
 scanf("%lf%lf",&x,&y);
 if(y<0)
  y = -y;
 z1 = x+1/y;
 z2 = x+1/y;
 printf("z=%d\n",z1);
 printf("z=%15.6lf\n",z2);
 printf("z=%e\n",z2);
}