#include <stdio.h>

float soma(float a, float b)
{
    float soma;
    soma = a + b;
    return soma;
}

float subtrai(float a, float b)
{
    float subtracao;
    subtracao = a - b;
    return subtracao;
}

float multiplica (float a, float b)
{
    float mult;
    mult = a * b;
    return mult;
}

float divide(float a, float b)
{
    float div;
    if(b == 0)
    {
        printf("Impossivel dividir com denominador igual a 0\n");
        return 0;
    }
    else
    {
        div = a / b;
        return div;
    }
}

int main(void)
{

    float n1, n2;
    char sinal;
    printf("Digite a operacao: (num1 operacao num2): ");
    scanf("%f %c %f", &n1, &sinal, &n2);

    if(sinal == '+')
    {
        printf("%f %c %f = %f\n", n1, sinal, n2, soma(n1, n2));
    }
    else if(op == '-')
    {
        printf("%f %c %f = %f\n", n1, sinal, n2, subtrai(n1, n2));
    }
    else if(op == 'x')
    {
        printf("%f %c %f = %f\n", n1, sinal, n2, multiplica(n1, n2));
    }
    else if(op == '/')
    {
        printf("%f %c %f = %f\n", n1, sinal, n2, divide(n1, n2));
    }

    return 0;
}