#include <stdio.h>
#include <stdlib.h>

char test1(void) {
  return 'a'+rand()%26;
}

double test2(double a) {
  return a * a;
}

void main(void) {
  char c = 'a';
  printf("%c\n", c);
  c = test1();
  printf("%c\n", c);
  printf("Carre de %lf = %lf\n",2.5,test2(2.5));
}