#include#include
int main(int argc, char **argv){  volatile int modified;  //设置关键词 int也许会被某种方式修改  char buffer[64];  //设置缓冲区空间字节容量为64  modified = 0  ;//初始化modified的值  gets(buffer);  //允许我们输入”buffer”的值可以理解我们输入的值会顺便丢到缓冲区中  if(modified != 0) {      printf("you have changed the 'modified' variablen");  } else {      printf("Try again?n");  }}

#include <stdlib.h>#include <unistd.h>#include <stdio.h>#include <string.h>
int main(int argc, char **argv){ volatile int modified; char buffer[64]; if(argc == 1) {  errx(1, "please specify an argumentn"); } modified = 0; strcpy(buffer, argv[1]); if(modified == 0x61626364) {  printf("you have correctly got the variable to the right valuen"); } else {  printf("Try again, you got 0x%08xn", modified); }}

volatile int modified;char buffer[64];

if(argc == 1) {    errx(1, "please specify an argumentn");}

modified = 0;strcpy(buffer, argv[1]);

if(modified == 0x61626364) {    printf("you have correctly got the variable to the right valuen");}else{    printf("Try again, you got 0x%08xn", modified);}

#include <stdlib.h>#include <unistd.h>#include <stdio.h>#include <string.h>
int main(int argc, char **argv){ volatile int modified; char buffer[64]; char *variable; variable = getenv("GREENIE"); if(variable == NULL) {  errx(1, "please set the GREENIE environment variablen"); } modified = 0; strcpy(buffer, variable); if(modified == 0x0d0a0d0a) {  printf("you have correctly modified the variablen");
 } else {  printf("Try again, you got 0x%08xn", modified); }}

Volatile int modified;Char buffer[64]Variable = getenv(“GREENIE”)

if（variable == NULL）{       Errx(1, “please set the GREENIE environment variablen”)

Modified = 0;

Strcpy(buffer, variable)

if(modified == 0x0d0a0d0a) {       printf(“you have correctly modified the variablen”);} else {       printf(“Try again, you got 0x%08xn”, modified);

GREENIE = `python -c “print(‘a’ * 64 + ‘0xa0xbx0ax0b’)”`