c - how to print values from file after appending -
i have following problem: must must make student file name, age , grades. works ok, problem when printing on screen. let's read 3 students, when type 'l' printing content on screen works great. when press 'a' add student file(append), student appear in file(so have total of 4 students), when press 'l' print again, prints 3 out of 4 students, including appended one, removes anther one. 's' stands write file.
#include <stdio.h> #include <stdlib.h> #include <ctype.h> struct student{ char nume[20]; int varsta; float medie; }; void citire_date(struct student *studenti, file *f, int n){ int i; for(i=0;i<n;i++){ printf("introduceti datele studentului %d\n", i+1); printf("nume: "); fflush(stdin); gets((studenti+i)->nume); printf("varsta: "); scanf("%d", &((studenti+i)->varsta)); printf("medie: "); scanf("%f", &((studenti+i)->medie)); fprintf(f, "nume: %s\n", (studenti+i)->nume); fprintf(f, "varsta: %d\n", (studenti+i)->varsta); fprintf(f, "medie: %.2f\n", (studenti+i)->medie); fprintf(f, "\n"); } } void afisare_date(struct student *studenti, int n){ int i; char nume1; int varsta1; float medie1; for(i=0;i<n;i++){ printf("nume: %s\n", (studenti+i)->nume); printf("varsta: %d\n", (studenti+i)->varsta); printf("medie: %.2f\n", (studenti+i)->medie); printf("\n"); } } void append(struct student *studenti, file *f){ int i; for(i=0;i<1;i++){ printf("nume: "); fflush(stdin); gets((studenti+i)->nume); printf("varsta: "); scanf("%d", &((studenti+i)->varsta)); printf("medie: "); scanf("%f", &((studenti+i)->medie)); fprintf(f, "nume: %s\n", (studenti+i)->nume); fprintf(f, "varsta: %d\n", (studenti+i)->varsta); fprintf(f, "medie: %.2f\n", (studenti+i)->medie); fprintf(f, "\n"); } } int main() { file *f; struct student studenti[20]; int n; char optiune; f=fopen("studenti.txt", "w"); if(f==null){ printf("nu s-a putut deschide/crea fisierul pentru scriere.\n"); exit(1); } printf("\n"); do{ printf("s. scriere fisier.\n"); printf("a. adaugarea unui nou student in fisier.\n"); printf("l. listarea datelor tuturor studentilor.\n"); printf("m. modificarea datelor unui student.\n"); printf("c. cautarea unui student dupa nume.\n"); printf("x. terminarea programului.\n"); printf("introduceti optiunea: "); fflush(stdin); optiune=toupper(getchar()); printf("\n"); switch(optiune){ case 's': printf("introduceti numarul de studenti: "); scanf("%d", &n); citire_date(studenti, f, n); fclose(f); printf("\n"); break; case 'a': f = fopen("studenti.txt", "a"); if(f==null ){ printf("nu s-a putut deschide fisierul pentru adaugare.\n"); exit(2); } append(studenti, f); fclose(f); break; case 'l': afisare_date(studenti, n); break; case 'm': break; case 'c': break; case 'x': break; default: printf("\nati introdus o optiune eronata!\n"); break; } }while(optiune!='x'); return 0; } i think need use fscanf, not know how becasue read file "nume: name" "varsta: 19" , on. thank in advance.
i edited main, should clear see now.
int main() { file *f; struct student studenti[20]; int n; char optiune; printf("introduceti numarul de studenti: "); scanf("%d", &n); f=fopen("studenti.txt", "w"); if(f==null){ printf("nu s-a putut deschide/crea fisierul pentru scriere.\n"); exit(1); } citire_date(studenti, f, n); fclose(f); printf("\n"); do{ printf("a. adaugarea unui nou student in fisier.\n"); printf("l. listarea datelor tuturor studentilor.\n"); printf("m. modificarea datelor unui student.\n"); printf("c. cautarea unui student dupa nume.\n"); printf("x. terminarea programului.\n"); printf("introduceti optiunea: "); fflush(stdin); optiune=toupper(getchar()); printf("\n"); switch(optiune){ case 'a': f = fopen("studenti.txt", "a"); if(f==null ){ printf("nu s-a putut deschide fisierul pentru adaugare.\n"); exit(2); } append(studenti, f); fclose(f); break; case 'l': afisare_date(studenti, n); break; case 'm': break; case 'c': break; case 'x': break; default: printf("\nati introdus o optiune eronata!\n"); break; } }while(optiune!='x'); return 0; } any suggestions ?
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