编译错误，但在DEV C++编译通过，望指教

小白的白 @ 2017-03-28 00:18:33

#include<stdio.h>
#include<string.h>
int main()
{
    char str[15],*p;
    p=str;
    gets(str);
    if(str[0]=='-'){//如果是负数，指针移动一位，提前输出符号 
        p++;
        printf("-");
    }
    strrev(p);//反转字符串 
    while(*p=='0')//找到第一个非零数 
    p++;
    if(*p=='0')//如果最后一位是零则指针后退一位 
    p--;
    puts(p);    
    return 0;
}

by OSYj @ 2017-03-31 20:01:46

source.cpp: 在函数‘int main()’中:

source.cpp:7:5: 警告：‘char* gets(char*)’ is deprecated (declared at /usr/include/stdio.h:638) [-Wdeprecated-declarations]

 gets(str);

^ source.cpp:7:13: 警告：‘char* gets(char*)’ is deprecated (declared at /usr/include/stdio.h:638) [-Wdeprecated-declarations]

 gets(str);

^ source.cpp:12:13: 错误：‘strrev’在此作用域中尚未声明

 strrev(p);//反转字符串 

^

编译错误

by OSYj @ 2017-04-06 20:31:18

source.cpp: 在函数‘int main()’中:

source.cpp:7:5: 警告：‘char* gets(char*)’ is deprecated (declared at /usr/include/stdio.h:638) [-Wdeprecated-declarations]

 gets(str);

^ source.cpp:7:13: 警告：‘char* gets(char*)’ is deprecated (declared at /usr/include/stdio.h:638) [-Wdeprecated-declarations]

 gets(str);

^ source.cpp:12:13: 错误：‘strrev’在此作用域中尚未声明

 strrev(p);//反转字符串 

^

编译错误