作业1

#include <stdafx.h>

#include <stdio.h>

int main () {  

int a,b,sum;  

a=123;

 b=456;

 sum=a+b;  

printf("sum is %d\n",sum);  

return 0; }

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; }

int main (){

 float x,y,z;

 scanf("%f%f",&x,&y);

 if(y<0){

  y=-y;}

 z=x+1/y;  

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

 printf("%15.6f\n",z);  

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

 return 0;