第三周周报

#include 
#define MAIN_FILE_PATH "test.txt" //文本放在.c相同路径
#define WORDS_NUMS 100 //宏定义

int main() {
	FILE *fp;
	char str[WORDS_NUMS + 1];//多加1是指符号

	
	fp = fopen(MAIN_FILE_PATH, "rt");
	if (fp == NULL) {
		printf("ERROR:open a null file");
		return 0;
	}
	
	while(fgets(str, WORDS_NUMS, fp) != NULL){
		printf("%s", str);
	}
	fclose(fp);

	
	fp = fopen(MAIN_FILE_PATH, "w"); 
	if (fp == NULL) {
		printf("ERROR:open a null file");
		return 0;
	}

	char strWrite[] = "abcd";
	char strRead[100];
	fwrite(str, sizeof(char), sizeof(strWrite), fp);
	fread(strRead, sizeof(char), sizeof(strWrite), fp);

	fclose(fp);
	return 0;
}

C语言文件