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//1. Дана строка из символов, найти кол-во слов начинающихся и кончающихся одной буквой
#include <stdio.h>
#include <string.h>
 
int main()
{
	int c = 0, i = 0;
	char s[90], symb;
	gets_s(s);
	while (s[i] != '\0' && s[i] != '.')
	{
		symb = s[i];
		printf_s("%c", symb);
		while (s[i] != '\0' && (s[i] != ' ') && (s[i] != '.'))
		{
			i++;
		}
		if (s[i - 1] == symb)
		{
 
			c++;
		}
		i++;
	}
	printf_s("%d", c);
	return 0;
}

prog.c: In function ‘main’:
prog.c:9:2: warning: implicit declaration of function ‘gets_s’; did you mean ‘fgetpos’? [-Wimplicit-function-declaration]
  gets_s(s);
  ^~~~~~
  fgetpos
prog.c:13:3: warning: implicit declaration of function ‘printf_s’; did you mean ‘printf’? [-Wimplicit-function-declaration]
   printf_s("%c", symb);
   ^~~~~~~~
   printf
/usr/bin/ld: /home/H2RI7u/ccAiD11o.o: in function `main':
prog.c:(.text.startup+0x25): undefined reference to `gets_s'
/usr/bin/ld: prog.c:(.text.startup+0x5a): undefined reference to `printf_s'
/usr/bin/ld: prog.c:(.text.startup+0xca): undefined reference to `printf_s'
collect2: error: ld returned 1 exit status

Standard output is empty