#include <stdio.h>


int areasquare (int a);
int areacircle (int b);
int arearectangle (int c, int d);
int areatriangle (int e, int f);


int main() {
    int a,b,c,d,e,f;
    
     printf("enter side of square: \n");
     scanf ("%d", &a);
     printf("enter radius of circle: \n");
     scanf ("%d", &b);
     printf("enter side of rectangle: \n");
     scanf ("%d", &c);
     printf("enter side of rectangle: \n");
     scanf ("%d", &d);
     printf("enter base of triangle: \n");
     scanf ("%d", &e);
     printf("enter height of triangle: \n");
     scanf ("%d", &f);
   
  int areasquare(int a);
  printf("%d\n", a*a);
  int areacircle(int b);
  printf("%f\n", 3.14*b*b);
  int arearectangle(int c, int d);
  printf("%d\n", c*d);
  int areatriangle(int e, int f);
  printf("%f\n", 0.5*e*f);
   
   
   
   
   
    return 0;
}
int areasquare(int a){
    printf("%d\n", a*a);
    return a*a;
}

int areacircle(int b){
    printf("%f\n", 3.14*b*b);
    return 3.14*b*b;
}

int arearectangle(int c, int d){
    printf("%d\n", c*d);
    return c*d;
}

int areatrianglee(int e, int f){
    printf("%f\n", 0.5*e*f);
    return 0.5*e*f;
}