#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
float a,b,res;
char op;
printf ("Calculadora\n");
printf ("Digite <operando><+-*/><operando>: ");
scanf ("%f%c%f",&a,&op,&b);
if (op == '+') res = a+b;
else if (op == '-') res = a-b;
else if (op == '*') res = a*b;
else if (op == '/') res = a/b;
else
{
printf ("Operação inválida (%c) entre os operandos %.2f e %.2f\n",
op, a, b);
system("PAUSE");
return 0;
}
printf ("%.2f %c %.2f = %.2f\n", a, op, b, res);
system("PAUSE");
return 0;
}