77 lines
1.5 KiB
Plaintext
77 lines
1.5 KiB
Plaintext
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#include <Windows.h>
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#include <stdio.h>
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#include <tchar.h>
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int strlen_my1(char s[])
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{
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char* p = s;
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while (*p++);
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return p - s - 1;
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}
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int strlen_my2(char* s) {
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char* p = s;
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while (*p != '\0') {
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p++;
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}
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return p - s;
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}
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int strcmp_my(const char str1[], const 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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return str1[i] - str2[i];
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}
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void strcpy_my(char* dest, char* src)
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{
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while (*dest++ = *src++);
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}
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void strcat_my(char* dest, char* src) {
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while (*dest) dest++;
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while (*src) {
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*dest = *src;
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dest++;
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src++;
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}
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*dest = '\0';
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}
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void strchr_my(const char* str, int c, char** result) {
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while (*str != '\0') {
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if (*str == c) {
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*result = (char*)str;
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return;
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}
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str++;
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}
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}
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void test_strchr_my() {
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const char* str1 = "Hello, World!";
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const char* str2 = "This is a test string.";
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1: <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 'o' <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> "Hello, World!"
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char* result1 = NULL;
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strchr_my(str1, 'o', &result1);
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if (result1 != NULL) {
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printf("%ld\n", result1 - str1);
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}
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else {
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printf("NULL\n");
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 2: <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 'z' <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> "This is a test string."
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char* result2 = NULL;
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strchr_my(str2, 'z', &result2);
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if (result2 != NULL) {
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printf("%ld\n", result2 - str2);
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}
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else {
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printf("NULL\n");
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}
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}
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