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#include <stdio.h>
// Function prototypes
int Shrink(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 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
printf("Invalid menu item, only 1 is accepted\n");
}
}
return 0;
}
/* function returning the Shrink of a number */
int Shrink(int value)
{
return value/2;
}

prog.c: In function ‘main’:
prog.c:21:11: warning: implicit declaration of function ‘Square’ [-Wimplicit-function-declaration]
 Results = Square(intValue);
           ^~~~~~
prog.c: At top level:
prog.c:29:1: error: expected identifier or ‘(’ before ‘return’
 return 0;
 ^~~~~~
prog.c:30:1: error: expected identifier or ‘(’ before ‘}’ token
 }
 ^

Standard output is empty