初始提交

Project/Src/rt-thread/examples/libc/rand.c

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+/*
+ * rand.c
+ *
+ *  Created on: 2010-11-17
+ *      Author: bernard
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <finsh.h>
+
+int libc_rand(void)
+{
+	int i1, i2;
+	int j1, j2;
+
+	/* The C standard says that "If rand is called before any calls to
+	 srand have been made, the same sequence shall be generated as
+	 when srand is first called with a seed value of 1." */
+	i1 = rand();
+	i2 = rand();
+	srand(1);
+	j1 = rand();
+	j2 = rand();
+	if (i1 < 0 || i2 < 0 || j1 < 0 || j2 < 0)
+	{
+		puts("Test FAILED!");
+	}
+	if (j1 == i1 && j2 == i2)
+	{
+		puts("Test succeeded.");
+		return 0;
+	}
+	else
+	{
+		if (j1 != i1)
+			printf("%d != %d\n", j1, i1);
+		if (j2 != i2)
+			printf("%d != %d\n", j2, i2);
+		puts("Test FAILED!");
+		return 1;
+	}
+}
+FINSH_FUNCTION_EXPORT(libc_rand, rand test for libc);