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#include <stdio.h>
 
int Square(int value);
int Cube(int value);
double Shrink (double value);
int main ()
 
{
 
/* variable definition: */
 
   int intValue, menuSelect,Results;
 
   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, \ 
     3 to calculate Half  \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)
 
     {
     	// Call the Shrink function
 
     	Results = Shrink(intValue);
 
     	printf ("Cube of %d is %lf \n", intValue,Results);
 
     }
 
     else
 
       printf("Invalid menu item, only 1, 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 value*value*value;
 
}
 
/* function returning half of a number */
 
double Shrink (int value)
 
{
	return value/2;
}

prog.c: In function ‘main’:
prog.c:30:65: warning: backslash and newline separated by space
      printf ("Enter 1 to calculate Square, 2 to calculate Cube, \
                                                                  
prog.c:66:32: warning: format ‘%lf’ expects argument of type ‘double’, but argument 3 has type ‘int’ [-Wformat=]
       printf ("Cube of %d is %lf \n", intValue,Results);
                                ^
prog.c: At top level:
prog.c:103:8: error: conflicting types for ‘Shrink’
 double Shrink (int value)
        ^~~~~~
prog.c:5:8: note: previous declaration of ‘Shrink’ was here
 double Shrink (double value);
        ^~~~~~

Standard output is empty