Accounting for a float in C - c

Question

So I adjusted the code and it seems to work minus one flaw. The shrink is now a float, but not returning the correct answer. when I attempt to shrink 9 for instance it returns 4.0 not 4.5...... 13 returns 6.0? New code is below:
include
int main ()
{
/* variable definition: */
int intValue, menuSelect,Results;
float sResults;
intValue = 1;
// While a positive number
while (intValue > 0)
{
printf ("Enter a positive Integer\n: ");
scanf("%d", &intValue);
if (intValue > 0)
{
printf ("Enter 1 to calculate Square, 2 to Calculate Cube, Enter 3 to Calculate Shrink \n: ");
scanf("%d", &menuSelect);
if (menuSelect == 1)
{
// Call the Square Function
Results = Square(intValue);
printf("Square of %d is %d\n",intValue,Results);
}
else if (menuSelect == 2)
{
// Call the Cube function
Results = Cube(intValue);
printf("Cube of %d is %d\n",intValue,Results);
}
else if (menuSelect == 3)
{
sResults = Shrink(intValue);
printf("shrink of %d is %f\n", intValue,sResults);
}
else
printf("Invalid menu item, only 1 or 2 or 3 is accepted\n");
}
}
return 0;
}
/* function returning the Square of a number */
int Square(int value)
{
return value*value;
}
/* function returning the Cube of a number */
int Cube(int value)
{
return valuevaluevalue;
}
int Shrink(int value)
{
return value*1/2;
}

Answer 1

Results = Shrink(intValue);
printf("shrink of %d is %f\n", intValue,sResults);
You're storing the result in Results, but then printing sResults. Those are two different variables, and sResults is still zero because it hasn't been assigned a value. Change sResults to Results in your printf statement.
However, since you're doing integer division, you'll get a result that's truncated to an integer: Shrink(5) will return 2. To fix that, you'll need to change Shrink to take a float argument instead of int, return float instead of int, and assign its result to sResult instead of Result.
Also, you're probably getting compiler warnings about the Square, Cube, and Shrink functions being undeclared. Those happen because the code that calls the functions is before the code that says what they are. It hasn't caused an actual problem for you yet, because the compiler handles the situation by assuming that each function takes an int argument and returns an int result, which coincidentally happens to be true. But if you change any of the functions to operate on float instead of int, your program will break because the calls will still be compiled as if they were int.
Move the three math functions up above main, or leave them at the bottom and put these lines before main:
int Square(int value);
int Cube(int value);
int Shrink(int value);
Those are called declarations, and they tell the compiler what types the functions operate on, so it knows how to handle them even before it sees their implementation. If you change the functions to operate on float instead of int, change the declarations to match.