weird value in operate variable, please help newbie

[Dux]

Hoping someone can help me debug this code, I get strange values in
operate variable, as far as I can see that is problem, in help welcomed.


#include <stdio.h>

int main()
{
float num1,num2;
float result;
char operate;

printf("Enter a number\n");
scanf("%f",&num1);
printf("Enter an operator\n");
scanf("%c",&operate);
printf("Enter number 2\n");
scanf("%f",&num2);
printf("variables = %f, %c, %f\n",num1,operate,num2);
switch(operate)
{ case '+': result = num1+num2;
printf("num1 + num2 = %.2f\n",result);
break;
case '-': result = num1-num2;
printf("num1-num2= %.2f\n",result);
break;
case '*': result = num1*num2;
printf("num1*num2= %.2f\n",result);
break;
case '/': result = num1/num2;
printf("num1/num2= %.2f\n",result);
break;
}
return 0;
}

 

[Mike Wahler]

Hoping someone can help me debug this code, I get strange values in
operate variable, as far as I can see that is problem, in help welcomed.


#include <stdio.h>

int main()
{
float num1,num2;
float result;
char operate;

printf("Enter a number\n");
scanf("%f",&num1);
getchar();

printf("Enter an operator\n");
scanf("%c",&operate);
getchar();

printf("Enter number 2\n");
scanf("%f",&num2);
getchar();

printf("variables = %f, %c, %f\n",num1,operate,num2);
switch(operate)
{ case '+': result = num1+num2;
printf("num1 + num2 = %.2f\n",result);
break;
case '-': result = num1-num2;
printf("num1-num2= %.2f\n",result);
break;
case '*': result = num1*num2;
printf("num1*num2= %.2f\n",result);
break;
case '/': result = num1/num2;
printf("num1/num2= %.2f\n",result);
break;
}
return 0;
}

What I've added above is only a "quick hack",
yor program will still not handle invalid input
correctly.

Study the documentation of 'scanf()' to learn
its behavior when the input is invalid. Then
consider desiging more robust input methods.
Hints: 'fgets()', 'strtod()'.

-Mike