133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
#define _CRT_SECURE_NO_WARNINGS
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#include <stdio.h>
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#include <string.h>
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#include <locale.h>
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#include <Windows.h>
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int strlen_my_arr(char str[]) {
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int len = 0;
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while (str[len] != '\0') {
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len++;
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}
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return len;
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}
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int strlen_my_ptr(char* str_ptr) {
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char* str_ptr_old = str_ptr;
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while (*str_ptr != '\0') {
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str_ptr++;
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}
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return (int)(str_ptr - str_ptr_old);
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}
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int strcmp_my_arr(char str1[], char str2[]) {
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int i = 0;
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while (str1[i] != '\0' && str2[i] != '\0' && str1[i] == str2[i]) {
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i++;
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}
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return str1[i] - str2[i];
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}
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int strcmp_my_ptr(char* str1, char* str2) {
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while (*str1 != '\0' && *str2 != '\0' && *str1 == *str2) {
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str1++;
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str2++;
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}
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return *str1 - *str2;
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}
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char* strcpy_my_arr(char dest[], char source[]) {
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int i = 0;
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while (source[i] != '\0') {
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dest[i] = source[i];
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i++;
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}
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dest[i] = '\0';
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return dest;
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}
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char* strcpy_my_ptr(char* dest, char* source) {
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while (*source != '\0') {
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*dest = *source;
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dest++;
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source++;
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}
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*dest = '\0';
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return dest;
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}
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char* strcat_my_ptr(char* destination, const char* source) {
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while (*destination != '\0') {
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destination++;
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}
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while (*source != '\0') {
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*destination = *source;
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destination++;
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source++;
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}
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return destination;
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}
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char* strchr_my_arr(char str[], int ch) {
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int i = 0;
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while (str[i] != '\0') {
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if (str[i] == (char)ch) {
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return &str[i];
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}
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i++;
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}
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return NULL;
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}
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char* strchr_my_ptr(char* str, int ch) {
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while (*str != '\0') {
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if (*str == (char)ch) {
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return str;
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}
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str++;
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}
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return NULL;
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}
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int main() {
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char test1[] = "1234567";
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char test2[] = "12345699";
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printf("test1 string = \"%s\"\n", test1);
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printf("test2 string = \"%s\"\n", test2);
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printf(" strlen = %d\n", (int)strlen(test1));
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printf("strlen_my_arr = %d\n", strlen_my_arr(test1));
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printf("strlen_my_ptr = %d\n\n", strlen_my_ptr(test1));
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printf(" strcmp = %d\n", strcmp(test1, test2));
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printf("strcmp_my_arr = %d\n", strcmp_my_arr(test1, test2));
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printf("strcmp_my_ptr = %d\n\n", strcmp_my_ptr(test1, test2));
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char test_strcpy[81];
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char test_strcpy_my_arr[81];
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char test_strcpy_my_ptr[81];
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strcpy(test_strcpy, test2);
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strcpy_my_arr(test_strcpy_my_arr, test2);
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strcpy_my_ptr(test_strcpy_my_ptr, test2);
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printf(" strcopy result = \"%s\"\n", test_strcpy);
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printf("strcopy_my_arr result = \"%s\"\n", test_strcpy_my_arr);
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printf("strcopy_my_ptr result = \"%s\"\n", test_strcpy_my_ptr);
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char test_strcat[81] = "abcde";
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char test_strcat_my_ptr[81] = "abcde";
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strcat(test_strcat, test2);
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strcat_my_ptr(test_strcat_my_ptr, test2);
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printf(" strcat result = \"%s\"\n", test_strcat);
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printf("strcat_my_ptr result = \"%s\"\n\n", test_strcat_my_ptr);
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char test3[] = "qazwsxedccdexswzaq";
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printf("test3 string = \"%s\"\n", test3);
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char* strchr_res = strchr(test3, 's');
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printf(" strchr 's' = {%p} = '%c', index = %d\n", strchr_res, *strchr_res, (int)(strchr_res - test3));
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char* strchr_my_arr_res = strchr_my_arr(test3, 's');
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printf("strchr_my_arr_res 's' = {%p} = '%c', index = %d\n", strchr_my_arr_res, *strchr_my_arr_res, (int)(strchr_my_arr_res - test3));
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char* strchr_my_arr_ptr = strchr_my_ptr(test3, 's');
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printf("strchr_my_arr_ptr 's' = {%p} = '%c', index = %d\n", strchr_my_arr_ptr, *strchr_my_arr_ptr, (int)(strchr_my_arr_ptr - test3));
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return 0;
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} |