Simpal calculater

#include <stdio.h>

float add(float num1, float num2);
float sub(float num1, float num2);
float mult(float num1, float num2);
float div(float num1, float num2);

int main()
{
    char op;
    float num1, num2, result=0.0f;

   printf("WELCOME TO SIMPLE CALCULATOR\n");
    printf("----------------------------\n");
    printf("Enter [number 1] [+ - * /] [number 2]\n");

    scanf("%f %c %f", &num1, &op, &num2);

    switch(op)
    {
        case '+':
            result = add(num1, num2);
            break;

        case '-':
            result = sub(num1, num2);
            break;

        case '*':
            result = mult(num1, num2);
            break;

        case '/':
            result = div(num1, num2);
            break;

        default:
            printf("Invalid operator");
    }

    printf("%.2f %c %.2f = %.2f", num1, op, num2, result);

    return 0;
}

float add(float num1, float num2)
{
    return num1 + num2;
}

float sub(float num1, float num2)
{
    return num1 - num2;
}

float mult(float num1, float num2)
{
    return num1 * num2;
}

float div(float num1, float num2)
{
    return num1 / num2;
}