C语言函数问题求解答，求大神

Question

输入2个整数，分别将其逆向输出，要求定义并调用函数fun(n)，它的功能是返回n的逆向值｡例如，fun(123)的返回值是321
函数出什么问题了，输出错了
#include
#include
int fun(int x);
int main(void)
{
int m1,m2;
printf("Input m1: ");
scanf("%d",&m1);
printf("Input m2: ");
scanf("%d",&m2);
printf("%d's reverse is:%d ",m1,fun(m1));
printf("%d's reverse is:%d ",m2,fun(m2));
return 0;}

int fun(int x)
{
int count,i,d,p,sum=0;
p=x;
if (x>0){
do{ x=x/10;
count++;} while (x!=0);
for (i=1;i<=count;i++){
d=p%10;

sum=sum+p*pow(10,count-i);
p=p/10;}

return sum;}
if (x<0){
 x=-x;

do{ x=x/10;
count++;} while (x!=0);
for (i=1;i<=count;i++){
d=p%10;

sum=sum+p*pow(10,count-i);
p=p/10;}
return  -sum;

}
}

Answer 1

int fun(int x)
{
int flg,i,sum=0;
if (x>0){
x=-x;
flg=1;
}
do{ m=x%10;
x=x/10;
sum = sum * 10 + m;
} while (x!=0);
if (flg ==1) {
sum = -sum；
}
return sum;
}