File I/O lab

This is a discussion on File I/O lab within the C Programming forums, part of the General Programming Boards category; I am just stuck on the syantax I know exactly what I need it to do but unsure how to ...

  1. #1
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    File I/O lab

    I am just stuck on the syantax I know exactly what I need it to do but unsure how to syntactical out put it to a file made a comment on it below //

    Code:
    #include<stdio.h>
    #include <stdlib.h>
    
    int main(int argc, char* argv[])
    {
    
    FILE *ptr_mail,out_mail;
    char sentence[1000];
    char sent[1000];
     int i=0,pos=1;
    ptr_mail =fopen(argv[1],"r");
    if (!ptr_mail)
      {  
      return 1;
      }
    //gets input from file prints by the sentence until AT_EOS
     while (fgets(sentence,1000, ptr_mail)!=NULL)
       {
    
         if(sentence[i]=='F'&& sentence[i+1]=='r' &&sentence[i+2]=='o'&&sentence[i+3]=='m' && sentence[i+4]==' ' )
           {
         //how do I put this all in oneline and too a file ?
         printf("%d",pos);
         printf(" ");
         printf("%s",sentence);
         //need to figure out how to put it to output file
         int fputs ( const char, FILE *stream );
         out_mail= fopen(outputFilename, "w");
         
          pos++;
        
           }      
         
       }
    
    
        fclose(ptr_mail);
        return 0;
    }

  2. #2
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    You may want to check out the fprintf() function to replace your printf().

    Jim

  3. #3
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    That makes sense it would put whatever in fprintf(...) to output but how do I actually declear it right now I have these long lists of errors b/c it doesn't like
    int fputs ( const char, FILE *stream );

  4. #4
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    Why are you trying to redefine fputs? Line 27 in the above code is a function definition, not a function call. Plus you are trying to define it differently than how it is defined in stdio.h.

    Jim

  5. #5
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    Its something my TA said i should use so I threw it in there other then that no idea lol.

  6. #6
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    Code:
    #include<stdio.h>
    #include <stdlib.h>
    #include <iostream>
    
    int main(int argc, char* argv[])
    {
    
    FILE *ptr_mail,*out;
    char sentence[1000];
    char sent[1000];
     int i=0,pos=1;
    ptr_mail =fopen(argv[1],"r");
    if (!ptr_mail)
      {  
      return 1;
      }
    //gets input from file prints by the sentence until AT_EOS
     while (fgets(sentence,1000, ptr_mail)!=NULL)
       {
    
         if(sentence[i]=='F'&& sentence[i+1]=='r' &&sentence[i+2]=='o'&&sentence[i+3]=='m' && sentence[i+4]==' ' )
           {
    //alright I think I have fprintf working now I cant figure out the syantx to put it to the Isteam or just a file.
         out  = fopen(output.txt, "w");
    
         if(out != NULL)
           {
             fprintf(out,"%d",pos);
             fprintf(out," ");
             fprintf(out,"%s",sentence);
           }
         //need to figure out how to put it to output file
         
         
         
          pos++;
        
           }      
         
       }
    
    
        fclose(ptr_mail);
        return 0;
    }

  7. #7
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    I suggest you look the documentation for fopen(), pay particular attention to the open modes. What happens when you open a file with the "w" specifier? Why are you continually opening the file in your loop without closing it? Why do you have the fopen() call inside your loop?

    Jim

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