C gdb Commands 🎯

Welcome to our comprehensive guide on C gdb commands! This tutorial is designed for both beginners and intermediate learners who wish to master debugging C programs using the GNU Debugger (gdb). Let's dive in!

What is gdb? 📝

GNU Debugger (gdb) is a powerful debugging tool used in C programming to help identify and fix errors (bugs) in your code. It allows you to step through your program line by line, inspect variables, and modify data while the program is running.

Installing gdb 💡

On most Linux distributions, gdb is pre-installed. For Windows and MacOS, you can download it from the official GNU website.

Basic gdb Commands ✅

Starting gdb

bash

gdb your_program

Replace your_program with the name of your C program.

Running the Program

bash

run

Quitting gdb

bash

quit

Navigating Through Your Program 💡

Continuing Execution

bash

continue

Stepping Over (Next Line)

bash

next

Stepping Into (Next Function Call)

bash

step

Displaying Variables

bash

print variable_name

Breakpoints 💡

Setting a Breakpoint

bash

break line_number

Listing Breakpoints

bash

info breakpoints

Deleting a Breakpoint

bash

delete breakpoint_number

Quiz 📝

Advanced gdb Features 💡

Source Code Navigation

bash

list

Viewing Call Stack

bash

backtrace

Setting Watchpoints

bash

watch variable_name

Code Example 🎯

Here's a simple C program demonstrating some of the discussed gdb commands:

#include <stdio.h>

int main() {
    int a = 5;
    int b = 10;

    printf("Sum: %d\n", a + b);

    return 0;
}

Save this code as example.c and compile it using the command:

bash

gcc example.c -g

The -g flag enables debugging information for gdb. Now, let's debug the program using gdb:

bash

gdb a.out

Once in gdb, you can execute the following commands to navigate through the program:

bash

list
break 6
run
next
print a
next
print b
next

This sequence of commands will take you step by step through the program, showing you the current state of a and b after each line execution. You can experiment with different gdb commands to explore the program further.

Happy debugging! 😃