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EASY/src/easy/ReadNCharactersGivenRead4.java

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	`1`	`+packageeasy;`
	`2`	`+`
	`3`	`+/**`
	`4`	`+ * The API: int read4(char *buf) reads 4 characters at a time from a file.`
	`5`	`+ *`
	`6`	`+ * The return value is the actual number of characters read. For example, it returns 3 if there is`
	`7`	`+ * only 3 characters left in the file.`
	`8`	`+ *`
	`9`	`+ * By using the read4 API, implement the function int read(char *buf, int n) that reads n characters`
	`10`	`+ * from the file.`
	`11`	`+ *`
	`12`	`+ * Note: The read function will only be called once for each test case.`
	`13`	`+ */`
	`14`	`+`
	`15`	`+/**`
	`16`	`+ * The problem description is pretty ambiguous, actually the problem means to Keep reading until`
	`17`	`+ * either you have gotten n characters or there is no more characters to read.`
	`18`	`+ */`
	`19`	`+publicclassReadNCharactersGivenRead4 {`
	`20`	`+publicintread(char[]buf,intn) {`
	`21`	`+intindex =0,next=0;`
	`22`	`+char[]buffer =newchar[4];`
	`23`	`+while(index <n && (next =read4(buffer)) !=0){`
	`24`	`+for(inti =0;i <next &&index <n;index++,i++){`
	`25`	`+buf[index] =buffer[i];`
	`26`	`+ }`
	`27`	`+ }`
	`28`	`+returnindex;`
	`29`	`+ }`
	`30`	`+`
	`31`	`+privateintread4(char[]buffer) {`
	`32`	`+//this is a fake method to make Eclipse happy`
	`33`	`+return0;`
	`34`	`+ }`
	`35`	`+}`

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