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#include <stdio.h>
 
int curAge, noYears;
 
int calcYear(int curAge);
 
int main(void)
{
	//Local Variables
	char userName[50];
	//Ask the suer for name and birth year
	printf("Enter your name: ");
	scanf("%s", &userName);
	printf("Enter your current age: ");
	scanf(" %d", &curAge);
 
	//Call the function to calculate the 
	noYears = calcYear(curAge);
 
	printf("%s is %d years old and will be %d in %d years.", 
			userName, curAge, DRINKING_AGE, noYears);
	return 0;
}
 
/* The function to get the future year */
int calcYear(int curAge)
{
	return(DRINKING_AGE-curAge);
}

prog.c: In function ‘maint’:
prog.c:13:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[50]’ [-Wformat=]
  scanf("%s", &userName);
         ~^   ~~~~~~~~~
prog.c:21:22: error: ‘DRINKING_AGE’ undeclared (first use in this function)
    userName, curAge, DRINKING_AGE, noYears);
                      ^~~~~~~~~~~~
prog.c:21:22: note: each undeclared identifier is reported only once for each function it appears in
prog.c: In function ‘calcYear’:
prog.c:28:9: error: ‘DRINKING_AGE’ undeclared (first use in this function)
  return(DRINKING_AGE-curAge);
         ^~~~~~~~~~~~
prog.c: In function ‘maint’:
prog.c:13:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", &userName);
  ^~~~~~~~~~~~~~~~~~~~~~
prog.c:15:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %d", &curAge);
  ^~~~~~~~~~~~~~~~~~~~~
prog.c: In function ‘calcYear’:
prog.c:29:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty