Thread: need help with calculator code for c

I need to create a calculator that will read the operator first followed by a space the first number and then another space the second number. So the user input should look like this
+ 8 8
then output it like this
8 + 8 = 16
This is what i have so far, I was wondering if i was on the right track and if not some tips please.

insert

Code:

#Include <stdio>
void main (void){

int sum, num1, num2, i;
double symbol;



printf("Enter Operator, Number 1, Number 2:\n");
scanf("%d",&symbol, &num1, &num2);


if (symbol = * ) {                   
	for (i = 0; i < num1 ; i++){
		sum = sum + num2;
}
	printf("%d", num1, * , num2, = , sum); 
}

else if (symbol = -){
	num1 - num2 = sum;

	printf("%d", num1, - , num2, =, sum);
}

else if (symbol = +){
	num1 + num2 = sum;

	printf("%d", num1, +, num2, =, sum);

}




else{
printf("Selection is Invalid");

I think you may want to look up how C operators such as * + - / etc work in your c texts.
You have your assignments backwards and it's going to produce a ton of compiler errors.

char symbol;
scanf("%c %d %d", &symbol, &num1, &num2);
if (symbol == '*')
sum = num1 + num2

Lots of other minor issues.

Originally Posted by nonoob

Lots of other minor issues.

Are we on a roll today, or what... twice now we've answered within a minute of eachother...

Originally Posted by CommonTater

Are we on a roll today,

If you were butter maybe. ;-)

Originally Posted by CommonTater

Are we on a roll today, or what... twice now we've answered within a minute of eachother...

Slow day at work.

Originally Posted by nonoob

Slow day at work.

Currently between projects...

okay so i changed somethings around...will this work or do i have to make the options cases?

insert

Code:

#Include <stdio>
void main (void){

int sum, num1, num2, i;
char symbol;



printf("Enter Operator, Number 1, Number 2:\n");
scanf("%c %d %d",&symbol, &num1, &num2);


if (symbol== '*' ) {                   
	for (i = 0; i < num1 ; i++){
		sum = sum + num2;
}
	printf("%d", num1, * , num2, = , sum); 
}

else if (symbol== '-'){
	num1 - num2 = sum;

	printf("%d", num1, - , num2, =, sum);
}

else if (symbol== '+'){
	num1 + num2 = sum;

	printf("%d", num1, +, num2, =, sum);

}
else if (symbol == '/'){

}

else if (symbol== 'e'){

}




else{
printf("Selection is Invalid"); 

}


}

First of all... have you tried compiling your code? What errors did you get?

C is case sensitive... #Include will not work... #include will.
C knows how to multiply... for your multiply function just use sum = num1 * num2;

Code:

num1 + num2 = sum;

There's no way you've compiled with stuff like this.

Originally Posted by mike65535

Code:

num1 + num2 = sum;

There's no way you've compiled with stuff like this.

That was sort of my point... he's gonna get a whole mess of errors and hopefully he'll climb into the books and learn some about C.