C++如何读取和写入文件代码

读取文件的代码示例：

#include <stdio.h>

int main() {
    char buffer[100];
    FILE* file = fopen("example.txt", "r");
    if (file == NULL) {
        printf("Error opening file!\n");
        return 1;
    }
    while (fgets(buffer, 100, file) != NULL) {
        printf("%s", buffer);
    }
    fclose(file);
    return 0;
}

写入文件的代码示例：

#include <stdio.h>

int main() {
    FILE* file = fopen("example.txt", "w");
    if (file == NULL) {
        printf("Error opening file!\n");
        return 1;
    }
    fprintf(file, "Hello World!\n");
    fclose(file);
    return 0;
}