Thread: Help with pasting strings to a .txt file

  1. #1
    Registered User
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    Oct 2018
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    4

    Help with pasting strings to a .txt file

    Hello,

    I have some trouble with my homework and I can't find the problem.

    my code:
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "input3.h"
    
    
    int main(int argc, char **argv) {
       if (argc < 3) {
            printf("Aufruf: %s <anzahl> <bundesland>\n", argv[0]);
            printf("Beispiel: %s 100 Bayern\n", argv[0]);
            printf("Klein-/GroƟschreibung beachten!\n");
            exit(1);
        }
        int anzahl = atoi(argv[1]);
        char *bundesland = argv[2];   
    
    
        
        char staedte[MAX_LAENGE_ARR][MAX_LAENGE_STR];
        char laender[MAX_LAENGE_ARR][MAX_LAENGE_STR];
        int bewohner[MAX_LAENGE_ARR];  
    
    
        int len = read_file("staedte.csv", staedte, laender, bewohner);
    
    
    char *result[len];
    int j, i=0;
    int diff = 1;
    int min =1;
    
    
    
    
    
    
    for (j=0; j<len; j++)  {
        result[j] = (char*) malloc(100*sizeof(char));
    diff = strcmp(bundesland, laender[j]);
    min = bewohner[j] - anzahl;
    
    
    
    
    
    
     if (diff ==0 && 0 <= min)  {
     snprintf(result[i], 100, "Die Stadt %s hat %d Einwohner.", staedte[j], bewohner[j]);
        i++;
                    }  
    }
                                 
    write_file(result, len);
     free(*result);
    }
    you open the code with ./<program name> <number> <country> and it pastes on a .txt file every city of the country + its population but only those whose population is higher than the entered number.

    My problem is that there are multiple empty lines and I don't know what to do.

  2. #2
    and the hat of int overfl Salem's Avatar
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    Indenting your code would be a start.

    > write_file(result, len);
    But the number of valid records found is given by 'i', not 'len'.

    > free(*result);
    This only frees the first result you malloc'ed, not all of them.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    Registered User
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    Thank you so much, found the problem now .

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