#include <stdio.h>
#include <stdlib.h>

void toUpper(char *a);

int main(int argc, char const *argv[]) {

  char array[10]; //character array

  //get input
  printf("%s", "Please enter a word no more than 10 characters long: ");
  fgets(array, 10, stdin);

  toUpper(&array[0]);

  //print the changed string
  printf("The changed string is %s", array);

  return 0;
}

void toUpper(char *a){
  //algorithm to convert to uppercase
  while(*a != '\n'){ //while theres still characters left
    if (*a >= 97 && *a <= 122){ //if character is lowercase
      *a -= ('a' - 'A'); //convert it to uppercase.
    }
    a++; //increment to next memory location
  }
}