Microprocessor
The forms of IF statements in FORTRAN 77 are called

Logic IF, block IF, arithmetic IF and negate IF
Logical IF and arithmetic IF
Logical IF and Block IF
Logical IF, block IF and arithmetic IF

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Microprocessor
When RET instruction is executed by any subroutine then

 the top of the stack will be popped out and assigned to the PC.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 the PC will be incremented after the execution of the instruction.

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