WAP to convert uppercase to lowercase

/* uppercase to lowercase */

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
b=sizeof(a);
printf("sizeof%d",b);
getch();
}

WAP to display reverse of enter no. using for loop

/*WAP to display reverse of enter no. using for loop*/

#include<stdio.h>
#include<conio.h>
void main()
{
int n,rem,i,rev=0;
clrscr();
printf("enter no.");
scanf("\n%d",&n);
for(i=n;i>0;)
{
rem=i%10;
rev=rev*10 +rem;
i=i/10;
}
printf("reverse is=%d",rev);
getch();
}