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#include<stdio.h>
#include<conio.h>
float cal(int a,char sym,int b);
main()
{
 int a=0,b=0;
 char sym='\0';
 float c=0.0;
 scanf("%d%c%d",&a,&sym,&b);
 c=cal(a,sym,b);
 printf("%d%c%d=%f\n",a,sym,b);
 getch();
}
float cal(int a,char sym,int b)
{
      float c=0.0;
      switch(sym)
      {
                 case '+': c=a+b;
                 case '-': c=a-b;
                 case '*': c=a*b;
                 case '/': if(b!=0)
                 {
                      c=(float)a/b;
                      return c;
                 }
                 else
                 {
                     printf("Devided by 0.\n");
                  exit(0);  /*±àÒëµÄʱºòÔÚÕâÐгö´í*/
     &n


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c programs

void myprintf(const char *format, ...)
{
va_list arglist;
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#include <stddef.h>
char * ___strtok = NULL;

char * strcpy(char * dest,const char *src)
{
char *tmp = dest;

while ((*dest++ = *src++) != '\0')
/* nothing */;
return tmp;
}

char * strncpy(char * des ......

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#include <ctype.h>¡¡¡¡¡¡¡¡ //×Ö·û´¦Àí
#include <errno.h>¡¡¡¡¡¡¡¡ //¶¨Òå´íÎóÂë
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#include <fstream.h>¡¡¡¡¡¡ //ÎļþÊäÈ룯Êä³ö
#include <iomanip.h>¡¡¡¡¡¡ //²ÎÊý»¯ÊäÈ룯Êä³ ......
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