GDB program debugging

GDB is a powerful program debugging tool released by GNU. It provides three functions:

1. Start the program debugging.

2. Let the program being debugged stop at the specified position

3. When the program is stopped, you can view the running status of the program.

Example:

1. compile and generate an executable file:

Gcc-g hello. c-o hello

2. Start GDB

Gdb hello

3. Set breakpoints in the main function

Break main

4. Run the program

Run

Common GDB commands

Gdb hello	Start GDB
File hello	Load file name
List (l)	View programs
Breakb) function name	Add a breakpoint at the function entry
Break (B) row number	Add a breakpoint to a specified row
Break (B) File Name: row number	Add a breakpoint to the specified row of the specified file
Break (B) row number if condition	When the condition is true, the breakpoint at the specified row number takes effect.
Info break	View All set breakpoints
Delete breakpoint number	Delete breakpoint
Run (r)	Start running the program
Next (n)	A single-step running program does not enter the sub-function)
Steps)	One-step program running
Continue (c)	Continue running the program
Print (p) variable name	View specified variable values
Finish	Run the program until the current function ends.
Watch variable name	Monitor specified variables
Quit (q)	Exit gdb

#include<stdio.h>#define MAX_RECORD_NUMBER 10int record[MAX_RECORD_NUMBER] ={12,76,48,62,94,17,37,52,69,32};swap(int* x,int* y){    int temp;    temp = *x;    *x = *y;    *y = temp;}int main(){    int i,j;    for(i=0;i<MAX_RECORD_NUMBER-1;i++)    {        for(j=MAX_RECORD_NUMBER-1;j>1;j++)        {            if(record[j])<record[j-1]            {                swap(&record[j],&record[j-1]            }        }     }    for(i=0;i<MAX_RECORD_NUMBER-1;i++)    {        printf("%d",record[i]);    }      printf("\n");    return 0;}