一起来学习C语言的输入和输出

#include <stdio.h>
 int main()
{
	char a[100];
	printf("Please enter: ");
	scanf("%s", a);
	printf("\nYou entered : %s\n", a);
 	return 0;
}

#include <stdio.h>
 int main()
{
	int a;
	printf("Please enter: ");
	a = getchar();
	printf("\nYou entered : ");
	putchar(a);
	printf("\n");
 	return 0;
}

int getchar(void);

int putchar(int a);

#include <stdio.h>
 int main()
{
	int a;
	while ((a = getchar()) != EOF) {
		putchar(a);
	}
	printf("EOF\n");
 	return 0;
}

#include <stdio.h>
 int main()
{
	char a[100];
	printf("Please enter: ");
	gets(a);
 	printf("\nYou entered : ");
	puts(a);
 	return 0;
}