Clibrary | 【04】c语言中的输入输出函数

以下是对字符、字符串的输入输出。

• 前言
• • 1、fgetc
  • 2、fgets
  • 3、fputc
  • 4、fputs
  • 5、getchar
  • 6、gets 注：C11已弃用
  • 7、putc
  • 8、putchar
  • 9、puts

int fgetc ( FILE * stream );

char * fgets ( char * str, int num, FILE * stream );

案例

void Demo_fgetc(){
	char ch;
	FILE * fp = fopen("test.txt", "r"); // 打开文件
	while ((ch=fgetc(fp)) != EOF)	// 逐个读取字符
	{
		printf("%c", ch);
	}
	fclose(fp);
}

int fputc ( int character, FILE * stream );

案例

void Demo_fputc(){
	char *arr = "I like ...";  
	FILE * fp = fopen("test.txt", "w"); // 以写的方式打开文件
	while (*arr != '')// 判断字串是否结束
	{
		fputc(*arr, fp);
		printf("%4c", *arr);
		arr++;
	}
	fclose(fp);
}

int fputs ( const char * str, FILE * stream );

案例

void Demo_fputs(){
	// 创建二维数组
	char *arr[2] = {
		"test onen",
		"test two"
	};
	FILE * fp = fopen("test.txt", "w"); // 以写入的方式打开文件

	for (int i = 0; i < 2; ++i){
		fputs(arr[i], fp);		// 将字符串写入文件
		printf("%s", arr[i]);
	}
	fclose(fp);
}

int getchar ( void );

案例

void Demo_getchar(){
	char ch;

	while ((ch = getchar()) != '#') // 输入字符，#号键结束
	{
		
		if (ch == 'n')
			continue;
		printf("%cn", ch);
	}
}

char * gets ( char * str );

案例

void Demo_gets(){
	char buf[1024];
	printf("请输入字符串：");
	gets(buf);

	printf("%sn", buf);
}

int putc ( int character, FILE * stream );

案例

	char c;

	FILE *fp= fopen("test.txt", "w");
	for (c = 'A'; c <= 'C'; c++) {
		putc(c, fp);
	}
	fclose(fp);

int putchar ( int character );

案例

void Demo_putchar(){
	char ch;
	for (ch = 'A'; ch <= 'C'; ch++) {
		putchar(ch);
	}
}

int puts ( const char * str );

案例

void Demo_puts(){
	char *arr = "test puts";
	puts(arr);
}