HomeWork C Day5

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

//funkciq zadacha 1
int strSize(const char* str){
    int counter  = 0;
    while(*str != '\0'){
        counter++;
        str++;
    }
    return counter;
}

//funkciq zadacha 2
int strCompare(const char* str1, const char* str2){
    while(*str1){
        if(*str1 != *str2){
            break;
        }
        str1++;
        str2++;
    }
    return (*str1 - *str2);
}

//funkciq zadacha 3
void strCopy(char* destination, const char* source){
    char* p = destination;

    while(*source != '\0'){
        *p = *source;
        p++;
        source++;
    }
    p = '\0';
}

//funkciq zadacha 4
char* strConcatenate(char* destination, const char* source){

    char* str1End = destination + strSize(destination);

    while (*source != '\0') {
        *str1End++ = *source++;
    }
    *str1End = '\0';

    return destination;
}

//funkciq zadacha 5
int cointainsNano(const char* str){
    int state = 0; // empty

    while (*str){
        if (state == 0){
            if (*str == 'n'){
                state = 1; // n
            }
        }else if (state == 1){
            if (*str == 'a'){
                state = 2; //na
            }else if (*str == 'n'){
                state = 1; //same state
            }else{
                state = 0; //empty
            }
        }else if (state == 2){
            if (*str == 'n'){
                state = 3; //nan
            }else{
                state = 0; //empty
            }
        }else if (state == 3){
            if (*str == 'o'){
                state = 4;
                return 1;
            }else if (*str == 'n'){
                state = 1; // n
            }else if (*str == 'a'){
                state = 2; // na
            }else{
                state = 0; // empty
            }
        }
        str++;
    }
    return 0;
}

//funkciq zadacha 6
int countNano(const char* str){

    int cnt = 0;
    int state = 0; //empty

    while (*str){
        if (state == 0){
            if (*str == 'n'){
                state = 1; //n
            }
        }else if (state == 1){
            if (*str == 'a'){
                state = 2; //na
            }else if (*str == 'n'){
                state = 1; //same state
            }else{
                state = 0; //empty
            }
        }else if (state == 2){
            if (*str == 'n'){
                state = 3; //nan
            }else{
                state = 0; //empty
            }
        }else if (state == 3){
            if (*str == 'o'){
                state = 4;
                cnt++;
            }else if (*str == 'n'){
                state = 1; //n
            }else if (*str == 'a'){
                state = 2; //na
            }else{
                state = 0; //empty
            }
        }else if (state == 4){
            if (*str == 'n'){
                state = 1; //n
            }else{
                state = 0; //empty
            }
        }
        str++;
    }
    return cnt;
}

int main(){

    //zadacha 1

    /*
    char str[50];
    printf("Enter string: ");
    gets(str);
    printf("Your string size is: %d", strSize(str));
    */

    //zadacha 2

    /*
    char str[50];
    char str2[50];
    printf("Enter first string: ");
    gets(str);
    printf("Enter second string: ");
    gets(str2);
    printf("String compare: %d", strCompare(str, str2));
    */

    //zadacha 3

    /*
    char str[50];
    char str2[50];
    printf("Enter first string: ");
    gets(str);
    strCopy(str2, str);
    printf("String 2 is: %s", str2);
    */

    //zadacha 4

    /*
    char str1[50];
    printf("Enter string: ");
    gets(str1);

    char str2[50];
    printf("Enter string: ");
    gets(str2);

    printf("Your concatenated strings: %s", strConcatenate(str1, str2));
    */

    //zadacha 5

    /*
    char str1[50];
    printf("Enter string: ");
    gets(str1);
    printf("Contains nano: %s\n", cointainsNano(str1) ? "yes" : "no");
    */

    //zadacha 6

    /*
    char str1[50];
    printf("Enter string: ");
    gets(str1);
    printf("Count nano: %d\n", countNano(str1));
    */

    return 0;
}