Function: Print a string in uppercase

#include <stdio.h>
#include <ctype.h>

void print_upper(char *string);

int main(void)
{
  char s[80];

  printf("Enter a string: ");
  gets(s);
  print_upper(s); 
  printf("\ns is now uppercase: %s", s);
  return 0;
}

void print_upper(char *string)
{
  register int t;

  for(t=0; string[t]; ++t)  {
    string[t] = toupper(string[t]);
    putchar(string[t]);
  }
}

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Function: Print a string in uppercase : Function « Function « C / ANSI-C

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