12. Mini Project — Menu Calculator

Functions + switch + live menu logic

Project goals:

Functions se operations
switch se menu
Khud extend karna

Chhota calculator: choice ke hisaab se add/sub.
Live me choice variable badal kar behavior dekho. Input box se bhi number de sakte ho next upgrades me.

Live practice 1 — Calculator menu

choice = 1 sum, 2 diff. Badal ke Run.

#include <cstdio>

int add(int a, int b) { return a + b; }
int sub(int a, int b) { return a - b; }

int main() {
    int x = 15, y = 4;
    int choice = 1;

    printf("x=%d y=%d\n", x, y);
    switch (choice) {
        case 1:
            printf("sum = %d\n", add(x, y));
            break;
        case 2:
            printf("diff = %d\n", sub(x, y));
            break;
        default:
            printf("invalid choice\n");
    }
    return 0;
}

Challenge: multiply/divide functions add karo; scanf se choice aur x,y lo (stdin box me: 1 15 4 jaisa pattern sochna).

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