C : Discount Question

Question

A very strange behavior I notice today while solving a pretty simple question...
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Cost Price and Discount(%) is given, find Selling Price
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#include <stdio.h>
#include <stdlib.h>
int main()
{
int b, d, p; //b is CP, d is Discount Rate, p is SP
scanf("%d\n%d", &b, &d);
p = b-(b*d/100); // This is where i want to stress
printf("%d", b);
printf("\n%d", p);
return 0;
}
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In the above code, if I change,
this line -> "p = b-(b*d/100);"
to -> "p = b-(b*(d/100));"
the answer goes wrong, completely!!!
===================
Really strange, just for a parenthesis!!! - my intention on giving it was just to make C understand it well, but went hard on me.
===================
If anyone can help me correct my wrong concept, it would be really appreciated... Thanks

Answer 1

d/100 is always 0.

Because d is integer, 100 is integer, and d is between 0 to 100.

int / int = int.

b*d is still integer, but is larger than 100, which produces an integer greater than 0.

Answer 2

Thanks CarrieForle

Answer 3

You can also use scanf("%f%f) instead of using escape sequence in between.

Answer 4

The remainders (or modulo) are dropped from integer math in C. You can change your variable types to float or cast for the math. However I would use the float type variables and if you are looking for whole numbers utilize the rounding functions.

Answer 5

d/100 is always 0.

Because d is integer, 100 is integer, and d is between 0 to 100.

int / int = int.

b*d is still integer, but is larger than 100, which produces an integer greater than 0.

Answer 6

I start a c language 😊