task2

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

int Addition(int x, int y) {
    return x+y;
}

int Substraction(int x, int y) {
    return x-y;
}

int Multiplication(int x, int y) {
    return x*y;
}

int Division(int x, int y) {
    return x / y;
}

int Square(int x) {
    return x * x;
}

int Square_Root(int x) {
    return sqrt(x);
}

int main(void) {
    int choice;
    int x, y;

    scanf("%d", &choice);
    printf("%c", choice);

    switch(choice) {
        case 1:
            scanf("%d %d", &x, &y);
            printf("%d", Addition(x, y));
            break;
        case 2:
            scanf("%d %d", &x, &y);
            printf("%d", Substraction(x, y));
            break;
        case 3:
            scanf("%d %d", &x, &y);
            printf("%d", Multiplication(x, y));
            break;
        case 4:
            scanf("%d %d", &x, &y);
            printf("%d", Division(x, y));
            break;
        case 5:
            scanf("%d", &x);
            printf("%d", Square(x));
            break;
        case 6:
            scanf("%d", &x);
            printf("%d", Square_Root(x));
            break;
        default:
            break;
    }
    return 0;
}