#include <stdio.h> /* Function prototypes */ int add(int a, int b) { return a + b; } int sub(int a, int b) { return a - b; } int mul(int a, int b) { return a * b; } int divide(int a, int b) { if (b == 0) { printf("Error: Division by zero!n"); return 0; } return a / b; } int main() { int choice, x, y; /* Array of function pointers */ int (*operations[4])(int, int) = {add, sub, mul, divide}; char *op_names[4] = {"+", "-", "*", "/"}; printf("Menu-driven calculatorn"); printf("0: Add (+)n1: Subtract (-)n2: Multiply (*)n3: Divide (/)n"); printf("Enter choice (0-3): "); scanf("%d", &choice); if (choice < 0 || choice > 3) { printf("Invalid choice!n"); return 1; } printf("Enter two numbers: "); scanf("%d %d", &x, &y); int result = operations[choice](x, y); // call function via pointer printf("Result: %d %s %d = %dn", x, op_names[choice], y, result); return 0; }