C语言字符串函数 #

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

int main() {
    char str[] = "Hello";
    printf("长度: %zu\n", strlen(str));
    return 0;
}

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

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

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

int main() {
    char src[] = "Hello World";
    char dest[6];
    strncpy(dest, src, 5);
    dest[5] = '\0';
    printf("复制后: %s\n", dest);
    return 0;
}

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

int main() {
    char str[20] = "Hello";
    strcat(str, " World");
    printf("连接后: %s\n", str);
    return 0;
}

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

int main() {
    char s1[] = "apple";
    char s2[] = "banana";
    
    int result = strcmp(s1, s2);
    if (result < 0) {
        printf("s1 < s2\n");
    } else if (result > 0) {
        printf("s1 > s2\n");
    } else {
        printf("s1 == s2\n");
    }
    return 0;
}

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

int main() {
    char str[] = "Hello World";
    char* p = strchr(str, 'o');
    if (p) {
        printf("找到: %s\n", p);
    }
    return 0;
}

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

int main() {
    char str[] = "Hello World";
    char* p = strstr(str, "World");
    if (p) {
        printf("找到: %s\n", p);
    }
    return 0;
}