用于模拟字符串的C函数

#include <stdio.h>
#include <string.h>

int main() {
    char str[] = "Hello, World!";
    int length = strlen(str);
    printf("Length of the string: %d\n", length);
    return 0;
}

#include <stdio.h>
#include <string.h>

int main() {
    char src[] = "Hello, World!";
    char dest[20];
    strcpy(dest, src);
    printf("Copied string: %s\n", dest);
    return 0;
}

#include <stdio.h>
#include <string.h>

int main() {
    char str1[20] = "Hello, ";
    char str2[] = "World!";
    strcat(str1, str2);
    printf("Concatenated string: %s\n", str1);
    return 0;
}

#include <stdio.h>
#include <string.h>

int main() {
    char str1[] = "Hello";
    char str2[] = "Hello";
    int result = strcmp(str1, str2);
    if (result == 0) {
        printf("Strings are equal\n");
    } else if (result < 0) {
        printf("String 1 is less than String 2\n");
    } else {
        printf("String 1 is greater than String 2\n");
    }
    return 0;
}

#include <stdio.h>
#include <string.h>

int main() {
    char str[] = "Hello, World!";
    char *ptr = strchr(str, 'o');
    if (ptr != NULL) {
        printf("Character found at position: %ld\n", ptr - str);
    } else {
        printf("Character not found\n");
    }
    return 0;
}