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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, 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) 
     { 
        // Call the Shrink function 
        Results = Shrink(intValue); 
        printf("Shrink 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 the shrink of a number */ 
double Shrink(int value) 
{     
	return value/2; 
}
 

prog.c: In function ‘main’:
prog.c:23:19: warning: implicit declaration of function ‘Square’ [-Wimplicit-function-declaration]
         Results = Square(intValue);
                   ^~~~~~
prog.c:29:19: warning: implicit declaration of function ‘Cube’ [-Wimplicit-function-declaration]
         Results = Cube(intValue);
                   ^~~~
prog.c:35:19: warning: implicit declaration of function ‘Shrink’ [-Wimplicit-function-declaration]
         Results = Shrink(intValue);
                   ^~~~~~
prog.c:36:35: warning: format ‘%lf’ expects argument of type ‘double’, but argument 3 has type ‘int’ [-Wformat=]
         printf("Shrink of %d is %lf\n",intValue,Results);
                                   ^
prog.c: At top level:
prog.c:55:8: error: conflicting types for ‘Shrink’
 double Shrink(int value)
        ^~~~~~
prog.c:35:19: note: previous implicit declaration of ‘Shrink’ was here
         Results = Shrink(intValue);
                   ^~~~~~

Standard output is empty