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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
	char name;
	int age, i;
 
	printf("Enter your first name letter: ");
	fflush(stdin);
	//scanf("%c", &name);
	name = getchar();
	// wyczysc bufor
	fflush(stdin);
	printf("Enter your age: ");
	scanf_s("%d", &age);
	printf("Mr. %c , %d years old.\n", name, age);
	printf("Enter a hexadecimal number: ");
	scanf_s("%x", &i);
	printf("You have entered %#x (%d).\n", i, i);
	system("pause");
	return 0;
}

prog.c: In function ‘main’:
prog.c:16:2: warning: implicit declaration of function ‘scanf_s’; did you mean ‘scanf’? [-Wimplicit-function-declaration]
  scanf_s("%d", &age);
  ^~~~~~~
  scanf
prog.c:21:2: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result [-Wunused-result]
  system("pause");
  ^~~~~~~~~~~~~~~
/usr/bin/ld: /home/Szq4J2/cc4KACvN.o: in function `main':
prog.c:(.text.startup+0x6c): undefined reference to `scanf_s'
/usr/bin/ld: prog.c:(.text.startup+0xab): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

Standard output is empty