C语言复制数组

 直接上代码，分别是栈上开辟内存，堆上开辟内存

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

void test01(){
    char filename[100];

    printf("请输入视频路径：\n");
    scanf("%s", filename);

    char *out_filename = malloc(sizeof(char)* 200);
    memset(out_filename, 0, sizeof(char)* 200);
    int pos = 0;
    for (int i = 0; i < strlen(filename) - 4; ++i){
        out_filename[pos++] = filename[i];
    }
    out_filename[pos] = '\0'; //不写\0会出现烫烫烫乱码
    strcat(out_filename, "_out.avi");
    printf("%s\n", out_filename);
    free(out_filename);
    out_filename = NULL;
}

void test02(){
    char filename[100];

    printf("请输入视频路径：\n");
    scanf("%s", filename);

    char tmp[100] = { 0 };
    int pos = 0;
    for (int i = 0; i < strlen(filename) - 4; ++i){
        tmp[pos++] = filename[i];
    }
    tmp[pos] = '\0'; //不写\0会出现烫烫烫乱码
    strcat(tmp, "_out.avi");

    printf("%s\n", tmp);
}

int main(){

    test01();
    test02();

    system("pause");
    return 0;
}

如果是用指针来复制数组，不要用以下代码

char *out_filename = 0;

因为没有开辟内存，直接对指针自增会出现访问冲突