Ошибка при чтении символов строки c string

Пытаясь делать курсовую работу, застрял вот на таком моменте:

Вот скриншот консоли на каком месте остановилась программа:

Я делаю решение системы линейных уравнений и думаю, что ошибка кроется в cout и cin, а именно в буфере ввода. Как я понял из информации в интернете, это происходит из-за того, что в нём остаётся символ n и от этого все проблема, но это не точно.

Когда убираешь <<z<< и остаётся просто: "Введите коэффициенты неизвестных уравнения через ;" << endl; — то программа продолжает работать и после ввода
коэффициентов, и вывода следующего cout опять та же ошибка. Уже пробовал всякие
cin.sync() и cin.clear(), но ничего не изменилось. Помогите пожалуйста и объясните как исправить.

#include <cuda.h>
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include <cstdlib>
#include <stdio.h>
#include <iostream>
#include<locale.h>
#include<curand.h>
#include<curand_kernel.h>
#include<time.h>
#include <stdlib.h>
#include <string>
#include <cstdio>

using namespace std;

__global__ void vichislenie( int *index, float *mas, int *kolvoperem )
{
    int indexGPU = threadIdx.x + *kolvoperem - 1 ;
    //for
    //while (index < 33792)
    //{
    /*if (*number < mas1[index])
        *otvchislo = 0;*/
    //index += blockDim.x * gridDim.x;
    //}
}
/*float *randomer(float *mas)

{
for (unsigned short i = 0; i < 33792; i++)
    mas[i] = 0.01 * (rand() % 10100);


return mas;
}*/




int main( void )
{
    setlocale( LC_ALL, "RUS" );
    unsigned short kolvostrok = 0;
    int kolvoperem = 0;
    int index = 0;
    float *masOtvet = new float[kolvostrok];
    cout << "Введите кол-во неизвестных переменных:  ";
    cin >> kolvostrok;
    cout << "Введите кол-во уравнений:  ";
    cin >> kolvoperem;
    cout << "Введите правые части уравнений:  ";

    for( unsigned short i = 0; i < kolvostrok; i++ ) {
        cin >> masOtvet[i];
        cin.sync();
        /*cin.ignore(numeric_limits<streamsize>::max(), 'n');
        cin.clear();
        cin.get();*/
        //int dummy; my_cin(dummy);
    }

    index = kolvostrok * kolvoperem;
    float *masKoefic = new float[index];

    for( unsigned short i = 0; i < index ; i++ ) {
        masKoefic[i] = 0.0;
    }

    char *str = new char[kolvoperem * 2 * kolvostrok * 16];

    for( unsigned short i = 0; i < ( strlen( str ) ); i++ ) {
        str[i] = ' ';
    }

    unsigned short schetchik = 1;
    unsigned short schetchik1 = 0;
    char *StrBufMas = new char[kolvoperem * 2 * 16];

    for( int z = 1; z < kolvostrok + 1; z++ ) {
        /*cin.ignore(numeric_limits<streamsize>::max(), 'n');
        cin.clear();
        cin.get();*/
        cout << "Введите коэфициенты неизвестных уравнения "
             << z << " через ;" << endl;
        cout << "(если в уравнении не полное кол-во переменных, то вместо них поставить нули): "
             << endl;
        cin >> StrBufMas;
    }

    //scanf("%s", *StrBufMas);
    schetchik1 = 1;

    for( unsigned short i = 0; i < kolvoperem * 2 * kolvostrok * 16; i++ ) {
        if( ( str[i + 1] ) == ' ' ) {
            if( schetchik1 == 1 ) {
            }
            else {
                break;
            }

            for( unsigned short i = 0; i < strlen( StrBufMas ); i++ ) {
                str[i + schetchik] = StrBufMas[i];

                if( i == ( strlen( StrBufMas ) ) - 1 ) {
                    schetchik = schetchik + strlen( StrBufMas ) + 1;
                    schetchik1 = 0;
                }
            }
        }
    }

    /*size_t t = 6;
    char s1[10] = " tttrrrrr";
    char *s2 = new char[1];
    strcpy(s2, (s1-t));*/
    delete [kolvoperem * 2 * 16] StrBufMas, StrBufMas = NULL;
    schetchik = 0;
    schetchik1 = 0;
    char StrBufMas1[16] = "";

    for( unsigned short i = 0; i < strlen( str ) - 1; i++ ) {
        if( ( str[i] == ' ' ) || ( str[i] == ';' ) ) {
            //i -= 1;
        }
        else {
            schetchik++;
            schetchik1++;

            /*char *StrBufMas = new char[schetchik1];
            StrBufMas[schetchik1 - 1] = str[i];*/
            //strcat(StrBufMas1, &str[i]);
            if( ( str[i + 1] == ' ' ) || ( str[i + 1] == ';' ) ) {
                strncpy( StrBufMas1, &str[i - schetchik1 + 1], schetchik1 );
                masKoefic[i - schetchik] = atof( StrBufMas1 );
                //StrBufMas1 = ;
                //delete[schetchik1] StrBufMas;
                schetchik1 = 0;

                for( unsigned char j = 15; j > 0; j-- ) {
                    StrBufMas1[j] = '';
                }
            }
        }
    }

    float *masAll = new float[index - 1 + kolvostrok];
    schetchik = 0;
    schetchik1 = 1;

    for( unsigned short i = 0; i < index - 1 + kolvostrok; i++ ) {
        if( i == ( index + schetchik ) / kolvostrok ) {
            masAll[i] = masOtvet[i - ( i * schetchik1 )];
            schetchik1++;
            schetchik = schetchik + index + kolvostrok;
        }
        else {
            masAll[i] = masKoefic[i];
        }
    }

    float *dev_mas;
    int *dev_index;
    int *dev_kolvoperem;
    cudaMalloc( ( void ** )&dev_index, sizeof( int ) );
    cudaMalloc( ( void ** )&dev_mas, sizeof( float ) );
    cudaMalloc( ( void ** )&dev_kolvoperem, sizeof( int ) );
    cudaMemcpy( dev_index, &index, sizeof( int ), cudaMemcpyHostToDevice );
    cudaMemcpy( dev_mas, &masKoefic, index * sizeof( float ),
                cudaMemcpyHostToDevice );
    cudaMemcpy( dev_kolvoperem, &kolvoperem, sizeof( int ),
                cudaMemcpyHostToDevice );
    vichislenie << <1, kolvoperem >> > ( dev_index, dev_mas, dev_kolvoperem );
    //n = atoi(S.c_str())
    /*float number;
    cout << "Введите число k:  ";
    cin >> number;

    int otvchislo = 1;
    int *dev_otvchislo;
    float *dev_number;

    unsigned short i = 256;
    while (i != 0)
    {
    cudaMalloc((void**)&dev_otvchislo, sizeof(int));
    cudaMalloc((void**)&dev_number, sizeof(float));

    cudaMemcpy(dev_otvchislo, &otvchislo, sizeof(int), cudaMemcpyHostToDevice);
    cudaMemcpy(dev_number, &number, sizeof(float), cudaMemcpyHostToDevice);

    float mas[33792];
    float *dev_mas1;
    randomer(mas);
    cudaMalloc((void**)&dev_mas1, 33792 * sizeof(float));
    cudaMemcpy(dev_mas1, &mas, 33792 * sizeof(float), cudaMemcpyHostToDevice);

    vichislenie << <128, 128 >> > (dev_number, dev_otvchislo, dev_mas1);

    cudaMemcpy(&mas, dev_mas1, 33792 * sizeof(float), cudaMemcpyDeviceToHost);
    cudaMemcpy(&otvchislo, dev_otvchislo, sizeof(int), cudaMemcpyDeviceToHost);

    cudaFree(dev_mas1);
    cudaFree(dev_number);
    cudaFree(dev_otvchislo);

    i -= 1;
    }


    if (otvchislo == 1)
    {
    unsigned char otv[4] = "да";
    cout << "Число k больше всех чисел в матрице? -" << otv << "n";
    }
    else
    {
    unsigned char otv[4] = "нет";
    cout << "Число k больше всех чисел в матрице? -" << otv << "n";
    }*/
    system( "pause" );
    return 0;
}

Ive been asked to write a function that merges two sorted (ascii sorted) strings without duplicates.
For example, for string1 = aabcd, and string2 = abbcdg, the end result string should be abcdg.
For some reason, the end result string doesnt allocate well, or so I think.. its not working anyway and its giving me weird characters instead of what its supposed to give.
The value of stringToReturn is always 0xfffffffe «Error reading characters of string», and inside it says «Unable to read memory»

main.c:

#include <stdio.h>
#include <stdlib.h>
#include "bohan.h"

int main() {
char* string1;
char* string2;
char* mergedString;
string1 = (char*)malloc(MAX_TEXT + 1);
if (string1 == NULL)
    return;
string2 = (char*)malloc(MAX_TEXT + 1);
if (string2 == NULL)
    return;
printf("Please enter string no. 1: ");
scanf("%s", string1);
printf("Please enter string no. 2: ");
scanf("%s", string2);
mergedString = merge_strings(string1, string2);
printf("%s n", mergedString);

free(string1);
free(string2);
free(mergedString);
}

bohan.c:

#include <stdio.h>
#include <stdlib.h>
#include "bohan.h"

int checkNumberOfChars(char* text) {
int sum = 0;
if (text == NULL)
    return 0;
while (*text != '')
{
    sum++;
    text++;
}
return sum;
}

char* merge_strings(char* text1, char* text2) {
int i;
int hasChanged;
char* stringToReturn;
if (text1 == NULL && text2 == NULL)
    return NULL;
stringToReturn = (char *)malloc(checkNumberOfChars(text1) + checkNumberOfChars(text2) + 1);
if (stringToReturn == NULL)
    return NULL;
for (i = 1; i <= MAX_ASCII; i++) {
    hasChanged = FALSE;
    if (*text1 != '' || *text2 != '') {
        if (*text1 != '') {
            if (i == *text1) {
                *stringToReturn = i;
                stringToReturn++;
                hasChanged = TRUE;
                while (*text1 == i)
                    text1++;
            }
        }
        if (*text2 != '') {
            if (i == *text2) {
                if (!hasChanged) {
                *stringToReturn = i;
                stringToReturn++;
                }
                while (*text2 == i)
                    text2++;
            }
        }
    }
    else
        break;
}
return stringToReturn;
}

bohan.h:

#ifndef DEF
#define TRUE 1
#define FALSE 0
#define MAX_TEXT 100
#define MAX_ASCII 255

int checkNumberOfChars(char *text);
char *merge_strings(char *text1, char *text2);

#endif DEF

Ive been asked to write a function that merges two sorted (ascii sorted) strings without duplicates.
For example, for string1 = aabcd, and string2 = abbcdg, the end result string should be abcdg.
For some reason, the end result string doesnt allocate well, or so I think.. its not working anyway and its giving me weird characters instead of what its supposed to give.
The value of stringToReturn is always 0xfffffffe «Error reading characters of string», and inside it says «Unable to read memory»

main.c:

#include <stdio.h>
#include <stdlib.h>
#include "bohan.h"

int main() {
char* string1;
char* string2;
char* mergedString;
string1 = (char*)malloc(MAX_TEXT + 1);
if (string1 == NULL)
    return;
string2 = (char*)malloc(MAX_TEXT + 1);
if (string2 == NULL)
    return;
printf("Please enter string no. 1: ");
scanf("%s", string1);
printf("Please enter string no. 2: ");
scanf("%s", string2);
mergedString = merge_strings(string1, string2);
printf("%s n", mergedString);

free(string1);
free(string2);
free(mergedString);
}

bohan.c:

#include <stdio.h>
#include <stdlib.h>
#include "bohan.h"

int checkNumberOfChars(char* text) {
int sum = 0;
if (text == NULL)
    return 0;
while (*text != '')
{
    sum++;
    text++;
}
return sum;
}

char* merge_strings(char* text1, char* text2) {
int i;
int hasChanged;
char* stringToReturn;
if (text1 == NULL && text2 == NULL)
    return NULL;
stringToReturn = (char *)malloc(checkNumberOfChars(text1) + checkNumberOfChars(text2) + 1);
if (stringToReturn == NULL)
    return NULL;
for (i = 1; i <= MAX_ASCII; i++) {
    hasChanged = FALSE;
    if (*text1 != '' || *text2 != '') {
        if (*text1 != '') {
            if (i == *text1) {
                *stringToReturn = i;
                stringToReturn++;
                hasChanged = TRUE;
                while (*text1 == i)
                    text1++;
            }
        }
        if (*text2 != '') {
            if (i == *text2) {
                if (!hasChanged) {
                *stringToReturn = i;
                stringToReturn++;
                }
                while (*text2 == i)
                    text2++;
            }
        }
    }
    else
        break;
}
return stringToReturn;
}

bohan.h:

#ifndef DEF
#define TRUE 1
#define FALSE 0
#define MAX_TEXT 100
#define MAX_ASCII 255

int checkNumberOfChars(char *text);
char *merge_strings(char *text1, char *text2);

#endif DEF

Я пытаюсь создать программу универмага для своего школьного проекта.
Я создал массив классов для продуктов, который для начала включает их названия, цены, наличие и количество приобретенных товаров.
Но почему то выскакивает ошибка
«Исключение по адресу 0x68665139 (vcruntime140d.dll) в Test project.exe:
0xC0000005: место записи нарушения прав доступа 0x86A1ECD8. »

Кроме того, я получаю сообщение об ошибке, называемое ошибкой чтения символов строки после выполнения.

Вот мой код:

#include<iostream>
#include<string>


using namespace  std;

class product {
 private:
    int stock;       //items in stock
    int add_stock;   //added stock
    int purchased;   //purchased items(reduces stock)
    string name;     //name of item
    float price;    //price of item

    public:

//fuctions to input all private variables
void setstock(int x) {
    stock = x;
}
void setaddstock(int x) {
    add_stock = x;
}
void setpurchased(int x) {
    purchased = x;
}
void setname(string x) {
    name = x;
}
void setprice(float x) {
    price = x;
}

//functions to output all private variables
int getstock() {
    return stock;
}
int getaddstock() {
    return add_stock;
}
int getpurchased() {
    return purchased;
}
string getname() {
    return name;
}
float getprice() {
    return price;
}

//function that restocks the items
void restock() {
    stock += purchased;
}

//function that deducts purchased items from stock
void destock() {
    if (stock >= purchased) {
        stock -= purchased;
    }
    else {                                                              //in case the purchase demand exceeds items in stock
        cout << "nSorry we only have " << stock << "amount of leftn";
    }
}
};




int main() {
int purchased;
product stuff[10];              //class array
int choice, total_qty = 0;      //choice-> to choose between products, 
total_qty-> total number of products purchased
char yesno;                     //to choose if user wants to buy anything 
else (for do loop)
float total_price = 0;          //total amount of money to be paid 


// declaring product name and price 

 stuff[1].setname  ("Coconut biscuits");                         
stuff[1].setprice  (12.0);
stuff[2].setname  ("Wai Wai noodles");                      stuff[2].setprice  (20.0);
stuff[3].setname  ("Cadbury Dairy Milk");                   stuff[3].setprice  (45.5);
stuff[4].setname  ("Lays");                                 stuff[4].setprice  (50.0);
stuff[5].setname  ("Rara Noodles");                         stuff[5].setprice  (18.5);
stuff[6].setname  ("Khajurko Puff");                        stuff[6].setprice  (50.0);
stuff[7].setname  ( "Nanglo Doughnut");                     stuff[7].setprice  (15.0);
stuff[8].setname  ( "Nanglo whole-wheat bread");            stuff[8].setprice  (65.0);
stuff[9].setname  ("Dabur Real fruit juice");               stuff[9].setprice  (30.0);
stuff[10].setname ("Coca-Cola");                            stuff[10].setprice (35.5);


// declairing the number of items in stock and setting purchased = 0 for easy calculation  
for (int i = 1; i <= 10; i++) {
    stuff[i].setstock     (100);
    stuff[i].setpurchased (0);
}


// displays the menu, make purchase, repeat
cout << "What would you like to buy?nnn";

do {

    for (int i = 1; i <= 10; i++) {
        cout << i << ". " << stuff[i].getname() << "nn";      //displays menu in format: 1. Biscuit
    }

    cout << "Enter your choice: ";
    cin >> choice;

    cout << "nnHow many of it would you like to buy?";
    cin >> purchased;
    stuff[choice].setpurchased(purchased);

    stuff[choice].destock();                            //function for destocking


    cout << "nnWould you like to buy other items?";
    cin >> yesno;

} while (yesno == 'y' || yesno == 'Y');

cout << "nnn";               //line spacing, nothing cool here


//this for loop calculates total quantity and price as well as  displays the receipt
for (int i = 1; i <= 10; i++) {
    total_qty += stuff[i].getpurchased();                                   //total quantity
    total_price += stuff[i].getpurchased() * stuff[i].getprice();                   //total price


    //only displays if stuff is purchased
    if (stuff[i].getpurchased() > 0) {

        //format: 1. Biscuit 4 10 40 
        cout << i << " " << stuff[i].getname() << " " << stuff[i].getpurchased() << " " << stuff[i].getprice() << " " << stuff[i].getpurchased()*stuff[i].getprice() << "n";
    }
}

// displays total price and quantity
cout << "ntotal quantity: " << total_qty;
cout << "ntotal price: " << total_price;



return 0;
}