# C - Help

 Robert Summers · December 15, 2014 So i have used typecasting and am stuck as to why, when I run my program I enter 10 for pumpkins sold and it gives me zero not 50 as I calculated before hand, why is this. ``#include int main(){    float moneyMade = 0;    int pumpkinPrice = 5;    int pumpkinsSold = 0;    printf("How many pumpkins did you sell: ");    scanf(" %.2f", &pumpkinsSold);    moneyMade = ((float)pumpkinPrice * (float)pumpkinsSold);    printf("Money made = %.2f", moneyMade);    return 0;}``Thank you for your help in return

## Replies

 Joe Gonzalez · December 17, 2014 Thank you. c student · December 16, 2014 you can easily break down your formula into separate smaller ones however, you would be looking for a general algorithm for your specific mathematical expression such as some function of the likes of:``for (n=1; ;n++) {        result += (((2*n)*pow(a,n+1))/((6*n)*pow(a,n))+pow(b,n+2));}``for expressions which would sum towards infinity, you require another expression or some kind of limit-testing function (to see if it converges or diverges) which would resolve your problem because simply summing numbers to infinity will obviously yield an infinite "number" result and this simply won't be appropriate. Joe Gonzalez · December 16, 2014 How would you write a summation problem such as   2a2/6a+b3  + 4a3/12a+b4 .....to the nth term( in others words infinite). I just need help with writing the math into code. I know how to do everything else. Thank you c student · December 15, 2014 What are you using to compile your program?  You might be having all of these errors because your program is compiling and ignoring potential errors and warnings which might cause weird behaviour.  Your scanf() function should be:`` scanf("%d", &pumpkinsSold);`` Robert Summers · December 15, 2014 Still returns 00 on my prompt Sagor Chowdhury · December 15, 2014 pumpkinsold has to int type.. you have to use %d c student · December 15, 2014 ``int pumpkinsSold = 0;  // declared as integer type````scanf (" %.2d", &pumpkinsSold);  // need to change your scan type as an integer "%d"``
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## C

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