Answer / Anil Kumar Ojha

Here's a simple example in C:
```c
#include <stdio.h>

void main() {
int num1, num2, choice;

printf("Enter two numbers:n");
scanf("%d %d", &num1, &num2);

printf("Enter operation number:
1. Addition
2. Subtraction
3. Multiplication
4. Division
5. Modulus
6. Exponentn");
scanf("%d", &choice);

switch(choice) {
case 1: printf("%d + %d = %d", num1, num2, num1 + num2); break;
case 2: printf("%d - %d = %d", num1, num2, num1 - num2); break;
case 3: printf("%d * %d = %d", num1, num2, num1 * num2); break;
case 4: if(num2 != 0) printf("%d / %d = %f", num1, num2, (float)num1 / num2); else printf("Error! Division by zero is not allowed."); break;
case 5: printf("%d mod %d = %d", num1, num2, num1 % num2); break;
case 6: printf("%d ^ %d = %d", num1, num2, pow(num1, num2)); break;
default: printf("Invalid operation number. Please enter a valid option.");
}
}
```
This code prompts the user to input two numbers and choose an operation, then it calculates the result using a switch-case statement.

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