Thread: Ultra noob programming help regarding printf and floats!

Hi all, I am having a hard time with some of my homework, specifically regarding how to printf floats. I can't seem to print the number i want out using float, it just becomes a jumbled mess.

Code:

#include <stdio.h>
#define TICKER "LRCX"
#define PURCHASE_DATE "01/02/13"
#define SELL_DATE "01/30/13"
#define INVESTMENT_AMOUNT "10,000.00"


int main ()
{
    printf("HELLO!\n");
    printf("Assignment #3\n");
    printf("Code::Blocks\n");


//Local Declarations
float purchase_price;
float sell_price;
float percentage;
float shares_purchased;
float am_gained_loss;
float shares_sold;
//Statements
    printf("Enter share purchase price for LRCX=>");
    scanf("%f",&purchase_price);


    printf("Enter the selling price for LRCX=>");
    scanf("%f",&sell_price);
    printf("\n");


//Calculations
shares_purchased = 10000 / purchase_price;
shares_sold = 10000 / sell_price;
am_gained_loss = purchase_price - sell_price;
percentage = purchase_price / sell_price;


//Result
    printf("Stock: " TICKER"\n");
    printf("Buy Date: " PURCHASE_DATE"\n");
    printf("Sell Date: " SELL_DATE"\n");
    printf("Buy Share Price: %.2f\n", &purchase_price);
    printf("Sell Share Price: %.2f\n", &sell_price);
    printf("Shares Purchased: %.2f\n",&shares_purchased);
    printf("\n");


    printf("Amount of Investment: "INVESTMENT_AMOUNT);
    printf("\n");


    printf("Value of Shares Sold:%.2f",&shares_sold);
    printf("\n");


    printf("Amount of Gain/Loss:%.2f\n", &am_gained_loss);
    printf("Percent Gain/Loss:%.2f%%\n",&percentage);
    printf("\n");


return 0;
}

Thats the code I currently have, I've probably tried everything to get the number to come out, but I just cant seem to figure it out. It should look like this, but with different numbers and stock:

Stock: MCD
Buy Date: 01/02/13
Sell Date: 01/29/13
Buy Share Price: $89.40
Sell Share Price: $91.50
Shares Purchased: 111.86

Amount of Investment: $10,000.00
Value of Shares Sold: $10,234.90
Amount of Gain/Loss: $234.90
Percent Gain/Loss: 2.35%

However, this is how mine turns out:

HELLO!
Assignment #3
Code::Blocks
Enter share purchase price for LRCX=>23
Enter the selling price for LRCX=>23


Stock: LRCX
Buy Date: 01/02/13
Sell Date: 01/30/13
Buy Share Price: -1.#R
Sell Share Price: -1.#R
Shares Purchased: -1.#R


Amount of Investment: 10,000.00
Value of Shares Sold:-1.#R
Amount of Gain/Loss:-1.#R
Percent Gain/Loss:-1.#R%




Process returned 0 (0x0) execution time : 2.864 s
Press any key to continue.


I apologize if this post is long, but I really need help on what I'm doing wrong. I probably spent at least two hours trying to figure this out and trying different things besides float like, double, and int.

Thanks guys!

You should be getting compiler errors.

Code:

main.c||In function 'main':|
main.c|43|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
main.c|44|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
main.c|45|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
main.c|53|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
main.c|57|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
main.c|58|warning: format '%.2f' expects type 'double', but argument 2 has type 'float *'|
||=== Build finished: 0 errors, 6 warnings ===|

These tell you exactly where to look.

Remove the '&' from before the variable names in your "printf()" statement - it is incorrect to include them in this context.

i.e.

Code:

printf("Buy Share Price: %.2f\n", &purchase_price);

// should be

printf("Buy Share Price: %.2f\n", purchase_price);

YAY! I <3 YOU! I knew it was something really small. Thanks again!

You're welcome. If you didn't receive those warnings from your compiler, you should turn up the warning levels.