3.1
#include <stdio.h>
#include <stdlib.h>int main()
{
int a=12,b=3;
float x=18.5,y=4.6;
printf ("%f\n",(float)(a*b)/2);
printf("%d\n",(int)x%(int)y);
return 0;
}
3.2
#include <stdio.h>
#include <stdlib.h>
int main()
{
int x=32,y=81,p,q;
p=x++;
q=--y;
printf ("%d%d\n",p,q);
printf ("%d%d\n",x,y);
return 0;
}