1. MCD
#include<conio.h>
#include<stdio.h>
main(){
int a,b;
int r,mcd;
printf("numero 1:n");
scanf("%d", &a);
printf("numero 2:n");
scanf("%d", &b);
do{
r=a%b;
if(r!=0)
{
a=b;
b=r;
}
else
mcd=b;
}while(r!=0);
printf("MCD es %dn", mcd);
getch();
}