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Ovidiu29

Problema Deschidere Si Scriere In Fisier (C++)

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Salutare tuturor. Nu-mi afiseaza in fisier nimica. Nu stiu unde am gresit.

#include<stdio.h>
#include<stdlib.h>
using namespace std;
long int n, s;
int main()
{
    FILE * f; FILE * g; f=fopen("numere.in","r"); g=fopen("numere.out","w");
    while(feof(f))
    {
        s+=n;
    }
    fclose(f);
    fclose(g);

    return 0;
}


Respecta si vei fi respectat.

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while(feof(f)) asta nu cred ca e bun. ia uitate inca o data ce face functia aia, nar trebui sa fie o negare pe acolo? ia gandestete ce face feof ala mai exact.

 

insa sunt sigur ca nu ai afisat niciunde. ai deschis niste fisiere, dar nu citesti si nu scrii in niciunu. Cum scrii sau citesti in/din fisier?


love is a verb
Love is a doing word

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Tot nu merge.

#include<stdio.h>
#include<stdlib.h>
using namespace std;
long int n, s=0;
int main()
{
    FILE * f; FILE * g; f=fopen("numere.in","r"); g=fopen("numere.out","w");
    while(fscanf(f,"%d",&n))
    {
        s+=n;
    }
    fprintf(g,"%d",s);
    fclose(f);
    fclose(g);

    return 0;
}

Respecta si vei fi respectat.

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#include<stdio.h>
#include<stdlib.h>
using namespace std;
 int n, s=0;
int main()
{
    FILE * f; FILE * g;
    f=fopen("numere.in","r");
    g=fopen("numere.out","w");

    while(fscanf(f,"%d",&n) == 1){  //daca citirea a reusit
        s+=n;
    }
    fprintf(g,"%d",s);
    fclose(f);
    fclose(g);

    return 0;
}

 

Userful:

http://www.cplusplus.com/reference/cstdio/fscanf/

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