2013-01-08 21:05:02 +08:00
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/*
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* rand.c
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*
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* Created on: 2010-11-17
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* Author: bernard
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <finsh.h>
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int libc_rand(void)
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{
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int i1, i2;
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int j1, j2;
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/* The C standard says that "If rand is called before any calls to
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srand have been made, the same sequence shall be generated as
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when srand is first called with a seed value of 1." */
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i1 = rand();
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i2 = rand();
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srand(1);
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j1 = rand();
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j2 = rand();
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if (i1 < 0 || i2 < 0 || j1 < 0 || j2 < 0)
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{
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puts("Test FAILED!");
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}
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if (j1 == i1 && j2 == i2)
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{
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puts("Test succeeded.");
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return 0;
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}
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else
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{
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if (j1 != i1)
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printf("%d != %d\n", j1, i1);
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if (j2 != i2)
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printf("%d != %d\n", j2, i2);
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puts("Test FAILED!");
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return 1;
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}
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}
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FINSH_FUNCTION_EXPORT(libc_rand, rand test for libc);
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