#include <stdio.h>

int main(void) {
    char shape;
    double area, base, height, side;

    printf("Do you have a square or triangle (s/t)? ");
    scanf("%c",&shape);

    if (shape == 's') {
        printf("What is the side of your square? ");
        scanf("%lf",&side);
        area = side * side;
    } //if
    else {
        printf("What is the base and height of your triangle? ");
        scanf("%lf %lf",&base, &height);
        area = base * height / 2;
    } //else
    printf("The area is %f\n",area);
    return 0;
} //main