memset函数的实现&printf函数几种输出格式的输出结果

#include<stdio.h>
#include<stdlib.h>
void *memmset(void *dest, int ch, int count){
		void *dest_init = dest;
		char* temp = (char*)dest;
		int i=0;
		for(; i<count;i++){
			*temp=(char)ch;
			temp++;
		}
		return dest_init;
}
int main(void){
	int count =sizeof(int)*2;
	char ch='A';
	char *dest = malloc(sizeof(int)*2);

	if(dest!=NULL){
	printf("init dest value:%d\n",dest);
	printf("original dest value:%d\n",*dest);
	printf("init dest value:%s\n",dest);
	printf("init dest value:%s\n",*dest);

	memmset(dest,ch,count);

	printf("init dest value:%d\n",dest);
	printf("original dest value:%d\n",*dest);
	printf("init dest value:%s\n",dest);
	printf("init dest value:%s\n",*dest);
	}else{
		printf("dest is NULL\n");
		return -1;
	}
	free(dest);

	return 0;
}

memset 之后， printf("init dest value:%c\n",*dest); 可打印出dest首地址的存储内容。