#include<stdio.h>
 main()
{int a,b,c,d,i;
 FILE *dfp;
    if((dfp=fopen("f:d.txt","a"))==NULL)
       {printf("no\n");
    exit(1);
       }
      fprintf(dfp,"\n");
    for(c=1;c<=9;c++)
    {for(d=1;d<=c;d++)
      { i=c*d;
     fprintf(dfp,"%d*%d=%d\t",d,c,i);
      }
    fprintf(dfp,"\n");
    }
    fclose(dfp);

}

if((dfp=fopen("f:d.txt","a"))==NULL)
这个就不对了吧 应该f:\d.txt

也不对，是f:\\d.txt

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tcl用多了c下面都忘记了
ms是燕子写的