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• You should really consider making functions for each mathematical operation and keep the main() simple.

As an example:

void addition(){

    float num1, num2;
    float result;
    
    printf("Enter first number: ");
            scanf("%f", &num1);

            printf("Enter second number: "); 
            scanf("%f", &num2);

    printf("\n");
    
    result = num1 + num2;
    
    printf("%.2f + %.2f = %.2f\n", num1, num2, result);

}

This way, you also create and destroy num1 num2 and result each function call.

• Consider asking the user if they would like to return to the menu, in case they want to do multiple calculations.

• You don't need multiple printf statements for the menu options. Simply continuing as such is needed:

  printf("1. Addition\n2. Subtraction\n3. Multiplication\n4. Division\n\n");