函数原型：int scanf(const char *format, ...);

解释：从标准输入文件获取format类型数据到指定地址，获取成功返回1否则返回0

#include <stdio.h>
#include <stdbool.h>

int main(int argc, char const *argv[])
{
    int m = 0,n;
	char ch;
    n = scanf("%d",&m);
    while(getchar()!='\n');//清空输入缓冲区
	scanf("%c",&ch);
    printf("m=%d n=%d\n",m,n);
	printf("ch=%c",ch);
    return 0;
}

/*cyj@cyj:/mnt/hgfs/Linux/c/day01$ ./day01_scanf
1234acc
a
m=1234 n=1
ch=a
cyj@cyj:/mnt/hgfs/Linux/c/day01$ ./day01_scanf
a
m=0 n=0
*/