After a function's last statement is executed, the program returns to the next line after the _____.

Question

BlackTom AI · Accepted Answer

Control returns to the statement immediately following the function call.

1) Relevant knowledge points and concepts
- Function call: when code invokes a function, execution jumps to that function’s body.
- Call stack / activation record: the runtime saves a return address and local environment before transferring control.
- Return/implicit return: when a function reaches a return statement or its final statement, the runtime uses the saved return address to resume execution where the call was made.

2) Step-by-step reasoning process
- Step 1: Execution reaches a function call in the caller (e.g., x = f();).
- Step 2: The runtime pushes an activation record on the call stack containing local variables and a return address (the instruction after the call).
- Step 3: Control jumps to the start of f(), and f() executes its statements.
- Step 4: When f() executes a return or reaches its last statement, the runtime pops f()’s activation record.
- Step 5: The runtime restores the saved return address and sets the program counter to that address.
- Step 6: Execution resumes at the next line after the original function call in the caller.

3) Intermediate steps / example
Example in C:
int main() {
  printf("Before
");     // line A
  foo();                  // line B — function call
  printf("After
");      // line C — this executes after foo returns
}
When foo() finishes, control returns to line C because the return address saved at the call points to the instruction after line B.

4) Why the correct answer is correct
The runtime explicitly saves where to continue execution when a function is called; that saved location is the statement after the function call. Thus, after the function’s last statement executes, control continues at the next line following the function call.

5) Why other plausible options are incorrect
- “Return statement” is not where the program continues; it’s the mechanism inside the function that triggers the return. The continuation point remains the statement after the function call.
- “Function definition,” “main,” or “start of program” are incorrect because control resumes at the caller location, not at unrelated code.

6) Conclusion
Therefore, the program returns to the next line after the function call. This matches the provided correct answer: function call.

After a function's last statement is executed, the program returns to the next line after the _____.单项选择题

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