为了更好地学习C语言,我过去两天一直在玩它。我想开始研究C语言在运行时的结构,因此我编写了一个糟糕的程序,要求用户输入两个整数值,然后打印整数变量的内存位置。然后,我想验证数据是否确实存在,因此我使用getchar()暂停程序,以便打开GDB并挖掘内存段以验证数据,但是那些位置上的数据对我来说没有太多意义。请问有人可以解释这里发生了什么吗?
程序代码:
#include <stdio.h>
void pause();
int main() {
int a, b;
printf("Please enter number one:");
scanf("%d", &a);
printf("Please enter number two:");
scanf("%d", &b);
printf("number one is %d, number two is %d\n", a, b);
// find the memory location of vairables:
printf("Address of 'a' %pn\n", &a);
printf("Address of 'b' %pn\n", &b);
pause();
}
void pause() {
printf("Please hit enter to continue...\n");
getchar();
getchar();
}
输出:
[josh@TestBox c_code]$ ./memory
Please enter number one:265
Please enter number two:875
number one is 265, number two is 875
Address of 'a' 0x7fff9851314cn
Address of 'b' 0x7fff98513148n
Please hit enter to continue...
内存段的GDB十六进制转储:
(gdb) dump memory ~/dump2.hex 0x7fff98513148 0x7fff98513150
[josh@TestBox ~]$ xxd dump2.hex
0000000: 6b03 0000 0901 0000 k.......
scanf("%X", &a);
和请输入数字一:456789AB
。 - chux - Reinstate Monica