fortran 77 fortran 77 fortran 77 fortran 77 fortran 77 fortran 77
fortran 77 fortran 77 fortran 77 fortran 77 fortran 77 fortran 77
fortran 77 fortran 77 fortran 77 fortran 77 fortran 77 fortran 77
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label CONTINUE<br />
{istruzioni}<br />
IF ({espressione logica}) GOTO label<br />
es: READ(*,*) X<br />
10 CONTINUE<br />
WRITE(*,*) X<br />
X=X+1<br />
IF (X.LE.100) GOTO 10<br />
FORTRAN <strong>77</strong><br />
UNTIL - loops<br />
FORTRAN <strong>77</strong><br />
DO - loops<br />
DO label {var} = {espr1},{espr2},{espr3}<br />
{istruzioni}<br />
label CONTINUE<br />
es: READ(*,*) X<br />
DO 10 I=X,100,1<br />
WRITE(*,*) I<br />
10 CONTINUE<br />
nota: DO-loops nidificati (nested)<br />
nota: DO WHILE in alcuni compilatori<br />
FORTRAN <strong>77</strong><br />
Unidimensionali (⇔ vettori)<br />
es: REAL A(15) equivale a REAL A(1:15)<br />
es: DO 10 I=1,15<br />
WRITE(*,*) X(I)<br />
10 CONTINUE<br />
Array<br />
Bidimensionali (⇔ matrici)<br />
es: REAL A(15,10) equivale a REAL A(1:15,1:10)<br />
Pluridimensionali (≤7)<br />
es: REAL A(15,10,5,1,1,5,10)<br />
FORTRAN <strong>77</strong><br />
Sottoprogrammi - FUNCTION<br />
{tipo} FUNCTION {nome} ({variabili})<br />
{dichiarazioni}<br />
{istruzioni}<br />
RETURN<br />
END<br />
es: REAL FUNCTION DELTA(A,B,C)<br />
REAL A,B,C<br />
DELTA=B**2-4.*A*C<br />
RETURN out in<br />
END<br />
SUBROUTINE {nome} ({argomenti})<br />
{dichiarazioni}<br />
{istruzioni}<br />
RETURN<br />
END<br />
...<br />
CALL {nome} ({argomenti})<br />
es: SUBROUTINE DELTA(A,B,C,D)<br />
REAL A,B,C,D<br />
D=B**2-4.*A*C<br />
RETURN<br />
END<br />
FORTRAN <strong>77</strong><br />
Sottoprogrammi - SUBROUTINE<br />
in out<br />
LIBRERIA = raccolta di sottoprogrammi<br />
FUNCTION<br />
es: SQRT(X)<br />
EXP(X)<br />
SIN(X)<br />
SUBROUTINE<br />
radice quadrata<br />
esponenziale<br />
seno<br />
FORTRAN <strong>77</strong><br />
es: SSWAP(N,X,INCX,Y,INCY) scambio X-Y<br />
STRSL(T,TDIM,N,B,JOB,INFO) sistemi Tx=b<br />
LIBRERIE<br />
4