#define _CRT_SECURE_NO_WARNINGS
#include <conio.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <cstring>
#include <string.h>
#include <locale.h>
#include "stdafx.h"

void sum_min_change(int n, double** a, int p, int q, int* index, int* jndex)
{
	double sum;
	sum = 0;
	int i, j;
	for (i = p; i < p + 1; i++) {
		for (j = 0; j < n; j++) {
			if (a[i][j] > 0) {
				sum += a[i][j];
			}
		}
	}
	double min;
	min = *(*(a + q));
	for (i = q; i < q + 1; i++) {
		for (j = 0; j < n; j++) {
			if (a[i][j] < min) {
				min = a[i][j];
				*index = i;
				*jndex = j;
			}
		}
	}
	a[*index][*jndex] = sum;
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			printf("%lf  ", *(*(a + i) + j));
		}
		printf("\n");
	}
}


double sum_first(int n, double** a)
{
	double summa;
	summa = 0;
	int i, j;
	int m;
	m = n / 2;
	if (n % 2 == 0) {
		for (i = 0; i < m; i++) {
			for (j = 0; j < m; j++) {
				summa += a[i][j];
			}
		}
	}
	else {
		for (i = 0; i < m + 1; i++) {
			for (j = 0; j < m + 1; j++) {
				summa += a[i][j];
			}
		}
	}
	return summa;
}

int count_let(char* str, char let)
{
	int k, i, j;
	k = 0;
	for (i = 0; i < strlen(str); i++) {
		if ((str[i] == let) && (str[i + 1] == ' ' || str[i + 1] == '\0')) {
			k++;
		}
	}
	return k;
}


int main(void)
{
	setlocale(LC_ALL, "rus");
	int index, jndex, t, p, q, n, i, j;
	index = 0;
	jndex = 0;
	p = 0;
	q = 0;
	printf("Enter a file's name.\n");
	char filename[100];
	FILE* fp = NULL;
	scanf("%s", filename);
	fp = fopen(filename, "r");
	t = fscanf_s(fp, "%i", &n);
	double** a = new double*[n];
	for (i = 0; i < n; i++) {
		a[i] = new double[n];
	}
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			t = fscanf_s(fp, "%lf", (*(a + i) + j));
		}
	}
	fclose(fp);
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			printf("%lf  ", *(*(a + i) + j));
		}
		printf("\n");
	}
	printf("\nEnter p\n");
	scanf("%i", &p);
	printf("\nEnter q\n");
	scanf("%i", &q);
	sum_min_change(n, a, p, q, &index, &jndex);
	printf("%lf\n", sum_first(n, a));
	for (i = 0; i < n; i++) {
		delete[] a[i];
	}
	delete[] a;
	printf("Enter another file's name.\n");
	char symbol;
	char filename1[100];
	char stroka[100];
	char* str;
	FILE* fps = NULL;
	scanf("%s", filename1);
	fps = fopen(filename1, "r");
	str = fgets(stroka, sizeof(stroka), fps);
	fclose(fps);
	printf("%s", stroka);
	getchar();
	printf("\nEnter a letter.\n");
	scanf("%c", &symbol);
	getchar();
	printf("%i\n", count_let(stroka, symbol));
	_getch();
	return 0;
}