4-4.c

一些简单的c51程序

#include<stdio.h>
#include <reg51.h> 
void subfun(int *m,int *n);
int main()
{
       int i,j;

	   SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1; 
       printf("i,j=?\n");
      scanf("%d,%d",&i,&j);  
   printf("In main before calling\n", "i=%-4d j=%-4d i*j=%-4d\n",i,j,i*j);
   subfun(&i,&j);  
   printf("In main after calling\n","i=%-4d j=%-4d i*j=%-4d\n",i,j,i*j);
      getchar();
      return 0;
   }
     
   void subfun(int *m,int *n)
     {
       *m=*m+2;
       *n=*n-*m;
       printf("In subfun after calling\n","m=%-4d n=%-4d m*n=%-4d\n",*m,*n, *m**n);

}