Control Flow

Control constructs allow the normal sequential order of execution to be changed. Fortran 90 supports:

• conditional execution statements and constructs, (IF ... and IF ... THEN ... ELSE ... END IF);
• loops, (DO ... END DO);
• multi-way choice construct, (SELECT CASE);

and less importantly,

• unconditional jump statements, (GOTO);
• I/O exception branching, (ERR=);

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