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#include<stdio.h>
 
int pal(int num);
 
void main()
 
{
 
    int num=625,res=0;
 
    res=pal(num);
 
    printf("%d",res);
    getch();
}
 
int pal(int num)
 
{
 
    int ans=0,rem=0,index=0;
 
    index=log10(num);
 
    if(index==0)
    {
        return ;
    }
 
    index--;
 
     rem=num%10;
     ans=ans*10+rem;
    return pal(index--);
 
}

prog.cpp:5:11: error: ‘::main’ must return ‘int’
 void main()
           ^
prog.cpp: In function ‘int main()’:
prog.cpp:14:11: error: ‘getch’ was not declared in this scope
     getch();
           ^
prog.cpp: In function ‘int pal(int)’:
prog.cpp:23:20: error: ‘log10’ was not declared in this scope
     index=log10(num);
                    ^
prog.cpp:27:9: error: return-statement with no value, in function returning ‘int’ [-fpermissive]
         return ;
         ^~~~~~

Standard output is empty