3:
#include <stdio.h>
int main() {
    printf("%d\n",4);
    printf("%d\n", 4/2);
    return(0);
}

4:
#include <stdio.h>
int main() {
    int i,n;
    float h;
    char c;
    printf("Digite sua idade, altura, numero favorito e a inicial do seu nome\n");
    scanf("%d %f %d %c", &i, &h, &n, &c);
    printf("\n---DADOS---\n");
    printf("Idade: \t\t%d anos\n", i);
    printf("Altura: \t\t.2f m\n", h);
    printf("Num fav: \t%d\n ", n);
    printf("Inicial: \t%c\n", c);
    return(0);
}

5:
#include <stdio.h>
int main() {
    float w,h;
    scanf("%f %f", &w, &h);
    printf("%.2f\n", w/(h*h));
    return(0);
}

6:
#include <stdio.h>
int main() {
    int a;
    char c;
    scanf("%d", &a);
    printf("%c\n", a);
    scanf("%c", &c);
    printf("%d", c);
    return(0);
}

7:
#include <stdio.h>
int main() {
    int a,b,c;
    scanf("%d %d", &a, &b);
    c = (a || b) && !(a && b);
    printf("%d\n",c);
    return(0);
}

8:
#include <stdio.h>
int main() {
   scanf("%d", &x);
   printf("%d\n", (x >> 31) & 1);
   return(0);
}

9:
#include <stdio.h>
int main() {
    int a,b;
    scanf("%d %d", &a, &b);
    printf("%d\n", (a + b - 1)/b);
    return(0);
}

10:
#include <stdio.h>
int main() {
    int a,b,c, ponderada;
    scanf("%d %d %d", &a, &b, &c);
    ponderada = a + 4*b + 2*c;
    printf("%d\n", (ponderada + 6) / 7);
    return(0);
}