标签:nts sys div bre img break not 连接 ++
/******************************************************* * Finds and prints n prime integers * Jeff Offutt, Spring 2003 ******************************************************/ public static void printPrimes (int n) { int curPrime; // Value currently considered for primeness int numPrimes; // Number of primes found so far. boolean isPrime; // Is curPrime prime? int [] primes = new int [MAXPRIMES]; // The list of prime numbers. // Initialize 2 into the list of primes. primes [0] = 2; numPrimes = 1; curPrime = 2; while (numPrimes < n) { curPrime++; // next number to consider ... isPrime = true; for (int i = 0; i <= numPrimes-1; i++) { // for each previous prime. if (isDivisible(primes[i], curPrime)) { // Found a divisor, curPrime is not prime. isPrime = false; break; // out of loop through primes. } } if (isPrime) { // save it! primes[numPrimes] = curPrime; numPrimes++; } } // End while // Print all the primes out. for (int i = 0; i <= numPrimes-1; i++) { System.out.println ("Prime: " + primes[i]); } } // end printPrimes
(a)绘制控制流图如下
(b)设计一个简单的错误,使得t2(n=5)比t1(n=3)更容易发现。
较容易发生的为数组越界错误。当MAXPRIMES为4时,t2会越界。
(c)找到一个测试用例,使得相应的测试路径访问连接while语句开始到for语句的边,而不通过while循环体。
当n=1时,即可满足要求。
(d)点覆盖:{1,2,3,4,5,6,7,5,6,8,9,10,11,12,13,14,15,16}
边覆盖:{(1,2),(2,3),(2,12),(3,4),(4,5),(5,6),(6,7),(6,8),(7,5),(8,9), (5,9),(9,10),(9,11),(10,11),(11,2),(12,13),(13,14),(14,15),(15,13), (13,16)}
主路径覆盖:{(1,2,3,4,5,6,7),(1,2,3,4,5,6,8,9,10,11),(1,2,3,4,5,6,8,9,11),(1,2,3,4,5,9,10,11),(1,2,3,4,5,9,11),(1,2,12,13,14,15),(1,2,12,16),(3,4,5,6,8,9,10,11,2,12,13,14,15),
(3,4,5,6,8,9,11,2,12,13,14,15),(3,4,5,6,8,9,10,11,2,12,13,16),(3,4,5,6,8,9,11,2,12,13,16),(3,4,5,9,10,11,2,12,13,14,15),(3,4,5,9,11,2,12,13,14,15),(3,4,5,9,10,11,2,12,13,16),
(3,4,5,9,11,2,12,13,16),(6,7,5,9,10,11,2,12,13,14,15),(6,7,5,9,11,2,12,13,14,15),(6,7,5,9,10,11,2,12,13,16),(6,7,5,9,11,2,12,13,16),(14,15,13,16),(13,14,15,13),(5,6,7,5),
(2,3,4,5,6,8,9,10,11,2),(2,3,4,5,6,8,9,11,2),(2,3,4,5,9,10,11,2),(2,3,4,5,9,11,2)}
package primes; public class Main { /*public static void main(String[] args){ System.out.println(printPrimes(20)); }*/ public static String printPrimes(int n){ int max=100; int curPrime; int numPrimes; boolean isPrime; String result = ""; int [] primes = new int [max]; primes[0] = 2; numPrimes = 1; curPrime = 2; while (numPrimes < n){ curPrime++; isPrime = true; for (int i = 0; i <= numPrimes-1; i++) { if (curPrime%primes[i]==0) { isPrime = false; break; } } if (isPrime) { primes[numPrimes] = curPrime; numPrimes++; } } for (int i = 0; i <= numPrimes-1; i++) { result += primes[i]+" "; } return result; } }
package primes; import static org.junit.Assert.assertEquals; import org.junit.Test; public class Maintest { String result; @Test public void test1(){ result = Main.printPrimes(10); assertEquals("2 3 5 7 11 13 17 19 23 29 ",result); } @Test public void test2(){ result = Main.printPrimes(20); assertEquals("2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 ",result); } }
标签:nts sys div bre img break not 连接 ++
原文地址:http://www.cnblogs.com/yitiaoxianyu/p/6569096.html