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#include <stdio.h>
// Function prototypes
int Square(int value);
int Cube(int 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 \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
printf("Invalid menu item, only 1 or 2 is accepted\n");
}
/* 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;
}
}
return 0;
}

prog.c:40:5: warning: ‘Cube’ defined but not used [-Wunused-function]
 int Cube(int value)
     ^~~~
prog.c:35:5: warning: ‘Square’ defined but not used [-Wunused-function]
 int Square(int value)
     ^~~~~~
/home/xPoAzO/ccSNvyni.o: In function `main':
prog.c:(.text.startup+0xa0): undefined reference to `Cube'
prog.c:(.text.startup+0xbf): undefined reference to `Square'
collect2: error: ld returned 1 exit status

Standard output is empty