试试我精心为您定制的6道题，您能指出以下程序存在什么问题吗？
(1)
#include <stdio.h>
int* blueguy(void);
int main(void)
{
   
    int *greengirl = NULL;
    greengirl  = blueguy();
    printf("%d", greengirl[0]);
    return 0;     
}
int* blueguy(void)
{
    int a[10] = {1,2,3,4,5,6,7,8,9,10};
    return a;
}

(2)
#include <stdio.h>
int main(void)
{
   
    char* blueguy;
    scanf("%s", blueguy);
    puts(blueguy);
    return 0;   
}

(3)
#include <stdio.h>
int main(void)
{
   
    char* blueguy = "freengirl";
    blueguy[0] = 'g';
    puts(blueguy);
    return 0;   
}

(4)
#include <stdio.h>
int factorial(int n);
int main(void)
{
    int blueugy, greengirl ;
    scanf("%d", &blueguy);
    greengirl = factorial(blueguy);     
    printf("%d", greengirl);
    return 0;   
}

int factorial(int n)
{
    if(n == 0)
    {
        return 1;
    }
    return factorial(n-1) * n;
}

(5)
#include <stdio.h>
#include <stdlib.h>
int main(void)
char *blueguy(void);
int main(void)
{
    char *greengirl = blueguy();
    greengirl[0] = 'b';
    puts(greengirl);

    return 0;
}

char *blueguy(void)
{
    char *x = malloc(10);
    strcpy(x, "alueguy");
    return x;
}

(6)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
    char *a = "blueguy";
    char *b = malloc(strlen(a));
    strcpy(b, a);
    puts(b);
    return 0;
}

[ 本帖最后由 BlueGuy 于 2010-5-30 10:54 编辑 ]

原本我打算录入到 Vc6.0调试指南的， 不过我觉得还是先提出来给大家玩玩再说 ，/

#include <stdio.h>
int* blueguy(void);
int main(void)
{
   
    int *greengirl = NULL;
    greengirl  = blueguy();
    printf("%d", greengirl[0]);
    return 0;     
}
int* blueguy(void)
{
    int a[10] = {1,2,3,4,5,6,7,8,9,10};
    return a;
}
返回指向堆栈的指针 结果无定义了
#include <stdio.h>
int main(void)
{
   
    char* blueguy;
    scanf("%s", blueguy);
    puts(blueguy);
    return 0;   
}
指针未初始化
#include <stdio.h>
int main(void)
{
   
    char* blueguy = "freengirl";
    blueguy[0] = 'g';
    puts(blueguy);
    return 0;   
}
blueguy指向的字符串地址是只读 不能修改
#include <stdio.h>
int factorial(int n);
int main(void)
{
    int blueugy;
    scanf("%d", &blueguy);
    greengirl = factorial(blueguy);     
    printf("%d", greengirl);
    return 0;   
}

int factorial(int n)
{
    if(n == 0)
    {
        return 1;
    }
    return factorial(n-1) * n;
}
greengirl没定义

#include <stdio.h>
#include <stdlib.h>
int main(void)
char *blueguy(void);
int main(void)
{
    char *greengirl = blueguy();
    greengirl[0] = 'b';
    puts(greengirl);

    return 0;
}

char *blueguy(void)
{
    char *x = malloc(10);
    strcpy(x, "alueguy");
    return x;
}
没有判断内存是否申请成功

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
    char *a = "blueguy";
    char *b = malloc(strlen(a));
    strcpy(b, a);
    puts(b);
    return 0;
}
malloc申请的内存少了  已经溢出了 改成char *b = malloc(strlen(a)+1);

//greengirl没定义
是我忘了定义了，已更正

#include <stdio.h>
int factorial(int n);
int main(void)
{
    int blueugy，greengirl;
    scanf("%d", &blueguy);
    greengirl = factorial(blueguy);     
    printf("%d", greengirl);
    return 0;   
}

int factorial(int n)
{
    if(n == 0)
    {
        return 1;
    }
    return factorial(n-1) * n;
}
没有看出什么大毛病 就是感觉用int有点不妥，因为n=17的时候 返回就溢出了

怎么没有人给我看看我的   啊！！！！！！！！！！！！

blueguy < 0, 会导致栈溢出

挺厉害的啊，多向你学习，/

哦 对头  输入负数 会被自动变成一个超大数  是要堆栈溢出  呵呵

受益匪浅，又明白了一点return返回的问题。

[ 本帖最后由 gaoce227 于 2010-5-30 11:56 编辑 ]