#348 Answer these C programming questions

Answer these C programming questions - Computer Science

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Answer these C programming questions based on its code. (Code of the lines may not be in the right place due to this format)

Line 1: #include

Line 2:

Line 3:

Line 4: int main (int argc, char *argv[])
Line 5: {
Line 6: int i, *p, count = 0;
Line 7: p = &count;
Line 8: for (i = 0; i < 5; i++) {
Line 9: count++;
Line 10: (*p)++;
Line 11: }
Line 12: printf("count = %d, I love money. \n", count);
return 0;
}

From the code above:

a) What is the output of the program and please explain why. (Don't use a compiler but your thought and show the process that came to be your answer)

b) Find the gdb command that makes the breakpoint in line 11.

c) Find the gdb command that shows the value of *p.

d) Compare and contrast step and continue commands. Show how these are interconnected with one another with the breakpoint that you determined in line 11.

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Free Chegg Answer

Part a): Output is count=10

• Since p stores address of count variable.
• That means, using (*p) we can access value of count.
• The loop runs 5 times for i = 0 to 4, for each i, count is incremented and (*p) is incremented.
• count is initially 0.
• So, count++ will result in increment of count by 5
• And, (*p)++ will result in increment of count by 5, since (*p) represents count
• So, count=10

Part b): GDB command that makes breakpoint at line 11

• break 11 ,or,
• b 11

Part c): GDB command that shows value of *p

• print *p ,or,
• p *p

Part d): Compare step and continue commands

• Continue: This command resumes the execution from the line where the code was paused by breakpoint. The code keeps on running till the next breakpoint is encountered or till successful execution of complete code.
• Step: This is used to execute only the current line where code is currently paused due to breakpoint. Once this line is executed, the code pauses at the next line.

For example, in the above code, once breakpoint result in pausing of code at line 11.

• If continue is called, code will execute from line 11 and run till the code ends.
• If step is called, line 11 will be executed and code will then pause at line 12.

Screenshot of Debugger: