C语言文件的写入字符串写入文件

#define _CRT_SECURE_NO_WARNINGS
#include"stdio.h"
#include"stdlib.h"
#include"string.h"

void main()
{
int i = 0;
char a[] = "abcdefdsafdsfgbbb";
FILE *fp = NULL;
//win  linux通用
char *filename = "d:/1.txt";

fp = fopen(filename, "a");
//循环写入
for (i = 0; i < strlen(a); i++)
{
fputc(a[i], fp);
}
fclose(fp);

system("pause");
}