Casting int to char, urgent question...

This is a discussion on Casting int to char, urgent question... within the C Programming forums, part of the General Programming Boards category; well, let me describe i need to convert my CONTADOR (int) to a char, CONTADOR starts in 0 and terminate ...

  1. #1
    Registered User
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    Apr 2006
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    22

    Casting int to char, urgent question...

    well, let me describe i need to convert my CONTADOR (int) to a char, CONTADOR starts in 0 and terminate in 512, take a look in my program e if possible help me...
    sorry by my english...
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <conio.c>
    int compara(char* a, char* b);
    int main(){
    
    char ENTRADA[50], SAIDA1[50], SAIDA2[50], NOMES[512][80];
    FILE *LER;
    FILE *ESCREVER2;
    FILE *ESCREVER1;
    int CONTADOR=0, AUX;
    
    puts("informe o nome do arquivo de entrada sem extensao(ex. arquivo)");
    gets(ENTRADA);
    puts("informe o nome do arquivo de saida sem extensao(ex. arquivo)");
    gets(SAIDA1);
    strcat(ENTRADA, ".bin");
    strcpy(SAIDA2,SAIDA1);
    strcat(SAIDA1, "a-n.bin");
    strcat(SAIDA2, "p-z.bin");
    if ((((LER = fopen(ENTRADA,"rb")) == NULL)||((ESCREVER1 = fopen(SAIDA1,"wb")) == NULL))||((ESCREVER2 = fopen(SAIDA2,"wb")) == NULL))  {
            puts("Arquivo nao pode ser aberto.");        
             }
    else{
       do{
            fread(NOMES[CONTADOR+1], sizeof(NOMES[CONTADOR]), 1, LER);
            strcat(NOMES[CONTADOR], " sequencial: ");
            strcat(NOMES[CONTADOR], CONTADOR);
            }while(!(feof(LER)));
       fclose(LER); 
       qsort(NOMES, CONTADOR, 80, compara);  // veja mais dessa função em: http://www.phim.unibe.ch/comp_doc/c_manual/C/FUNCTIONS/qsort.html (biblioteca STDLIB.H)
       for(AUX=0;AUX<=CONTADOR, AUX++){
            if(((NOMES[AUX][0]>='A')&&(NOMES[AUX][0]<='N'))||((NOMES[AUX][0]>='a')&&(NOMES[AUX][0]<='n')){
            fwrite(NOMES[AUX], 80, 1, SAIDA1);
            }
            else{
            fwrite(NOMES[AUX], 80, 1, SAIDA2);
            }
            }
       }
    
    
    }
    int compara(char *a, char *b)
    {
        return(strcmp(a, b));
    }

  2. #2
    ATH0 quzah's Avatar
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    URGENT REQUEST: READ THE FORUM GUIDELINES!


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    and the hat of wrongness Salem's Avatar
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    Lots to think about here
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <conio.c>
    int compara(char* a, char* b);
    int main(){
    
      char ENTRADA[50], SAIDA1[50], SAIDA2[50], NOMES[512][80];
      FILE *LER;
      FILE *ESCREVER2;
      FILE *ESCREVER1;
      int CONTADOR=0, AUX;
    
      puts("informe o nome do arquivo de entrada sem extensao(ex. arquivo)");
      //!! read
      //!! http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1049157810&id=1043284351
      gets(ENTRADA);
      puts("informe o nome do arquivo de saida sem extensao(ex. arquivo)");
      gets(SAIDA1);
    
      strcat(ENTRADA, ".bin");
      strcpy(SAIDA2,SAIDA1);
      strcat(SAIDA1, "a-n.bin");
      strcat(SAIDA2, "p-z.bin");
    
      /*!! there are some () over-use issues here */
      if ( ( ((LER = fopen(ENTRADA,"rb")) == NULL)||
             ((ESCREVER1 = fopen(SAIDA1,"wb")) == NULL)
           ) ||
           ((ESCREVER2 = fopen(SAIDA2,"wb")) == NULL)
         )  {
        puts("Arquivo nao pode ser aberto.");
      }
      else{
        do{
          /*!! you don't check the return result of read */
          fread(NOMES[CONTADOR+1], sizeof(NOMES[CONTADOR]), 1, LER);
    
          /*!! strcat is bad here, fread() does NOT guarantee a \0 at the end */
          /*!! of whatever data you've read in */
          /*!! In addition, you've already filled the buffer with the read */
          /*!! there is no room to append more data */
          strcat(NOMES[CONTADOR], " sequencial: ");
    
          /*!! my guess is you need to figure out sprintf to convert */
          /*!! an int into a string, then append that string to your result */
          strcat(NOMES[CONTADOR], CONTADOR);
    
          /*!! Also, you DON'T increment your CONTADOR variable */
        }while(!(feof(LER)));
        //!! read
        //!! http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1046476070&id=1043284351
    
        fclose(LER);
    
        // veja mais dessa função em:
        // http://www.phim.unibe.ch/comp_doc/c_manual/C/FUNCTIONS/qsort.html
        // (biblioteca STDLIB.H)
        qsort(NOMES, CONTADOR, 80, compara);
    
        /*!! I'm sure the , should be a ; */
        /*!! in addition, if you just want the data read, then */
        /*!! the test should be <, not <= */
        for(AUX=0;AUX<=CONTADOR, AUX++){
          /*!! there are some () issues here */
          /*!! In particular, there is a ) missing */
          if ( ((NOMES[AUX][0]>='A')&&(NOMES[AUX][0]<='N')) ||
               ((NOMES[AUX][0]>='a')&&(NOMES[AUX][0]<='n')) {
            fwrite(NOMES[AUX], 80, 1, SAIDA1);
          }
          else{
            fwrite(NOMES[AUX], 80, 1, SAIDA2);
          }
        }
      }
    }
    
    /*!! qsort compare functions are passed const void* pointers */
    /*!! these you must cast to the appropriate type before comparing */
    int compara(char *a, char *b)
    {
      return(strcmp(a, b));
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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