string_manipulation1.c

#include<stdio.h>
#include<string.h>
#pragma warning(disable : 4996)
int strlen2(const char* arr);
int modifyArray(char* arr);
char* strcpy2(char* destination, const char* source);
char* strcat2(char* destination, const char* source);
int strcmp2(const char* str1, const char* str2);
int main()
{
    char a[15] = { 'a','u','n','g',' '};
    char b[] = { 'v','k','n','t','\0'};
    char c[] = "aungb";
    char d[] = "aunga";
    char k[7] ;
    char* array;
    int result = strcmp(c, d);
    printf("%d\n", result);

    //printf("strlen2(a)= %d  strlen2(b)= %d", strlen2(a), strlen2(b));

}

int strlen2(const char * arr)
{
    int count = 0;
    while (arr[count] != '\0' && arr[count] != -52)
    {
        //printf("arr[%d]=%d=%c\n", count, arr[count], arr[count]);
        count++;
    }
    printf("\n\n\n");
    return count;
}

int modifyArray(char* arr)
{
    arr[0] = 'p';
    arr[1] = 'a';
    arr[2] = 'd';
    return 0;
}

char* strcpy2(char* destination, const char* source)
{
    int count = 0;
    while (source[count] != '\0' && source[count] != -52)
    {
        destination[count] = source[count];
        count++;
    }
    destination[count] = '\0';
    return destination;
}

char* strcat2(char* destination, const char* source)
{
    int len1 = strlen2(source);
    int len2 = strlen2(destination);
    for (int i = 0; i < len1; i++)
    {
        destination[len2 + i] = source[i];
    }
    return destination;
}

int strcmp2(const char* str1, const char* str2)
{
    int count = 0;
    int str1_len = strlen2(str1);
    int str2_len = strlen2(str2);
    if (str1_len > str2_len)
    {
        return 1;
    }
    if (str1_len < str2_len)
    {
        return -1;
    }
    if (str1_len == str2_len)
    {
        while (str2[count] != '\0' && str2[count] != -52)
        {
            if (str1[count] == str2[count])
            {
                count++;
            }
            else
            {
                return str1[count] - str2[count];
            }
        }
    }
    return str1[count] - str2[count];
}