Java实现两个整数相除

public class DeleTwoNum {
public static void main(String[] args){
int a = 7;
int b = 300;
int c = 5;
System.out.println("a/b=" + delTwoNum(a, b, c));
}

/**
* 得到两个整数相除的结果
* @param a 被除数
* @param b 除数
* @param c 精度，小数点位数
* @return 相除的结果
*
*/
private static float delTwoNum(int a, int b, int c){
if(b == 0){
throw new RuntimeException();
}
if(a == 0){
return 0;
}
int prePart = getPrePart(a, b);
String aftPart = getAftPart(a, b, c);
return Float.valueOf(prePart + "." + aftPart);
}

//获取小数部分
private static String getAftPart(int a, int b, int c) {
if(c == 0){
return "";
}
while(a >= b){
a = a - b;
}
if(a == 0){
return "0";
}
String aft = "";
int sum = 0;
for(int i = 0; i < 10; i++){
sum += a;
}
a = sum;
aft = aft + getPrePart(a, b) + getAftPart(a, b, c - 1);
return aft;
}

//获取整数部分
private static int getPrePart(int a, int b) {
if(a < b){
return 0;
}else{
int count = 0;
while(a >= b){
a = a - b;
count++;
}
return count;
}
}
}