Funcț iile printf() și scanf() [612541]

Funcț iile printf() și scanf()
Funcțiile printf() și scanf() sunt utilizate in limbajul C
pentru introducerea și afișarea datelor cuprinse în
biblioteca stdio.h . Așadar, datele sunt preluate de la
tastatură prin intermediul funcției scanf() și, după
prelucrare, afișate pe ecran cu ajuto rul funcției printf() .
I. Funcția printf()
Sintaxa pentru această funcție este:
printf(format, e 1, e2, …, e n);
Tipurile de variabilă cel mai des folosite sunt:
 %c – citeș te un număr întreg ;
 %d, %i – citeș te un număr zecimal ;
 %o – citeș te un număr octal fără semn ;
 %f, %e, %g – citeș te un număr real ;
 %s – citeș te un șir de caractere ;
 %x – citeș te un număr hexazecimal fără semn ;
 %ld – citeș te un număr de dimensiuni mari .
Următorul program ilustrează utilizarea
specificatorilor de format %c, %d, %o, %x, %X, %f, %ld,
%s:

După compilarea și executarea acestui program, va
apărea urmatorul rezultat :

Funcția printf() face parte dintr -o fam ilie de funcții
care cuprinde și:
 funcția vprintf() , având sintaxa următoare:

vprintf(const char * restrict format, va_list ap);
Exemplu:

După compilarea și executarea aestui program pe
ecran va apărea:

 funcțiile fprintf() și vfprintf() , având sintaxele
următoare:
fprintf( FILE * restrict stream, const char * restrict
format, va_list ap );
Exemplu:

vfprintf( FILE * restrict strea m, const char * restrict
format, va_list ap );
Exemplu:

 funcțiile sprint f(), snprintf() și vsnprintf()
Sintaxele acestor funcții sunt:
sprintf( char * restrict str, const char * restrict
format, … );
Exemplu:

snprintf( char * restrict str, size_t size, const char *
restrict format, …);
Exemplu:

vsnprintf( char * restrict str, size_ t size, const char *
restrict format, va_list ap);
Exemplu:

II. Funcția scanf()

Sintaxa funcției scanf este urmatoarea :
scanf( format, e 1, e2, …, en);
Obs. Indiferent de formatul folosit, la întâlnirea
unui spațiu în introducerea datelor, este terminată
citirea variabilei.

Pentru această funcție trebuie folosit operatorul
de adresă „&”.
Obs. Citirea cu ajutorul funcției scanf a șirurilor
de caractere care conțin spații este imposibilă.
Exemplu:
Următorul program ne permite introducerea
datelor de la tastatură, cu ajutorul funcției scanf:
#include<stdio.h>
int main()
{int n;
printf( “Introduceti un numar: ”);
scanf (“%d”, &n);
printf (“Numarul introdus este %d \n”, n);
}
După compilarea și executarea pr ogramului pe
ecran va apărea:

Din familia acestei funcții mai fac parte și:
 funcția fscanf()
fscanf(FILE *restrict stream, const char *restrict
format, …);
 funcția vfscanf()
vfscanf(FILE *restrict stream, const char *restrict
format, va_list arg);
 funcția sscanf()

sscanf(const char *restrict s, const char *restrict
format, …);
 funcția vsscanf()
vsscanf(const char *restrict s, const char *restrict
format, va_list arg);

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  • Str. Calea Mărășești, Nr. 157, Bacău 600115 [618487]

    ROMÂNIA MINISTERUL EDUCAȚIEI NAȚIONALE UNIVERSITATEA „VASILE ALECSANDRI” DIN BACĂU DEPARTAMENTUL PENTRU PREGĂTIREA PERSONALULUI DIDACTIC Str. Calea Mărășești, Nr. 157, Bacău 600115 Tel/Fax: +40234/588935; Tel/Fax: +40234/580050 www.dppd.ub.ro E-mail: [anonimizat];[anonimizat] PORTOFOLIUL DIDACTIC COORDONATOR ȘTIINȚIFIC: ABSOLVENT: [anonimizat]. univ. dr Pichiu Io nela Andreea Timofti Iulia Cristina SPECIALIZAREA: Terapie Ocupaț ională BACĂ U 2013 ROMÂNIA MINISTERUL EDUCAȚIEI NAȚIONALE UNIVERSITATEA…