c - debug assertion expression stream!=null every time i use fopen -


i'm having problems not 1 2 3 programs using files , commands fopen, fscanf, while(strcmp(input,"e")!=0).atleast, think problem. these programs show same error debug assertion failed! expression (stream!=null).i tried nothing seems work pls help. cant understand do. pls reply possible.this 1 of programs:

    # include <stdio.h>      # include <conio.h>      # include <string.h>      # include <stdlib.h>     void main()      { char add[6],length[10],input[10],binary[12],bitmask[12],relocbit;        int start,inp,len,i,address,opcode,addr,actualadd;        file *fp1=fopen("relinput.dat","r");        file *fp2=fopen("reloutput.dat","w");       system("cls");       printf("enter actual starting address : ");        scanf("%d",&start);        fscanf(fp1,"%s",input);        while(strcmp(input,"e")!=0)        { if(strcmp(input,"h")==0)           { fscanf(fp1,"%s",add);             fscanf(fp1,"%s",length);            fscanf(fp1,"%s",input);            }          if(strcmp(input,"t")==0)           { fscanf(fp1,"%d",&address);              fscanf(fp1,"%s",bitmask);            address+=start;            len=strlen(bitmask);             for(i=0;i<len;i++)              { fscanf(fp1,"%d",&opcode);                 fscanf(fp1,"%d",&addr);                 relocbit=bitmask[i];                if(relocbit=='0')                     actualadd=addr;                else                     actualadd=addr+start;                 fprintf(fp2,"%d\t%d%d\n",address,opcode,actualadd);                    address+=3;               }            fscanf(fp1,"%s",input);           }         }          fclose(fp1);          fclose(fp2);          printf("finished");          getch();           }

you need error checking on fopen procedures , in general. error due fscanf or fopen returning unexpected value didn't catch.

more useful tips:

  • debug breakpoints if ide allows to
  • format code more in line , readable
  • comment on functions make clear do, future readers or future self.

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