PointerExe1

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

float squareS(int* a){
    return (*a) * (*a);
}

float rectS(int* a, int* b){
    return (*a) * (*b);
}

float triangleS(int* a, int* h){
    return ((*a) * (*h)) /2;
}

float circleS(int* r){
    return M_PI * (*r) * (*r);
}

int main()
{
    printf("Input number of the figure you want: \n1. Square\n2. Rectangle\n3. Rectangular triangle\n4. Circle\n");
    int num;

    scanf("%d", &num);

    int a;
    int b;
    int h;
    int r;
    float s;

    if(num == 1){
        printf("Input side of the square:\n");
        scanf("%d", &a);

        s = squareS(&a);
        printf("%.2f", s);
    }else if(num == 2){
        printf("Input sides of the rectangle:\n");
        scanf("%d %d", &a, &b);

        s = rectS(&a, &b);
        printf("%.2f", s);
    }else if(num == 3){
        printf("Input side and height of the triangle:\n");
        scanf("%d %d", &a, &h);

        s = triangleS(&a, &h);
        printf("%.2f", s);
    }else if(num == 4){
        printf("Input radius of the circle:\n");
        scanf("%d", &r);

        s = circleS(&r);
        printf("%.2f", s);
    }else{
        printf("Wrong number!");
    }
    return 0;
}