124 lines
1.9 KiB
C
124 lines
1.9 KiB
C
#include <assert.h>
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void testmuli(long a, long b, long ab)
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{
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assert (a * b == ab);
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}
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void testdivi(long a, long b, long ab)
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{
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assert (a / b == ab);
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}
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void shltesti(long a, long b, long ab)
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{
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assert (a << b == ab);
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}
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void shrtesti(long a, long b, long ab)
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{
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assert (a >> b == ab);
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}
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long sieve(long size)
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{
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bool sieve[1000];
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for(long i=0; i<size; i+=2)
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{
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sieve[i] = false;
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sieve[i+1] = true;
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}
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sieve[2] = true;
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for (long i = 3; i * i < size;)
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{
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long j = i * i;
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while (j < size)
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{
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sieve[j] = false;
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j += 2 * i;
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}
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do {i++;} while (i < size && !sieve[i]);
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}
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long num = 0;
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for(long i=0; i<size; i++)
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{
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if (sieve[i])
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num++;
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}
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return num;
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}
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int main(void)
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{
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testmuli(0, 0, 0);
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testmuli(1, 0, 0);
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testmuli(0, 1, 0);
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testmuli( 1, 1, 1);
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testmuli(-1, 1, -1);
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testmuli(-1, -1, 1);
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testmuli( 1, -1, -1);
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testmuli(5, 5, 25);
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testmuli( 127, 255, 32385);
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testmuli(-127, 255, -32385);
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testmuli( 127, -255, -32385);
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testmuli(-127, -255, 32385);
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testdivi( 1, 1, 1);
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testdivi(-1, 1, -1);
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testdivi( 1, -1, -1);
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testdivi(-1, -1, 1);
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testdivi( 11, 4, 2);
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testdivi(-11, 4, -2);
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testdivi( 11, -4, -2);
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testdivi(-11, -4, 2);
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shltesti( 17, 1, 34);
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shltesti(-17, 1, -34);
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shltesti( 1700, 1, 3400);
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shltesti(-1700, 1, -3400);
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shrtesti( 34, 1, 17);
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shrtesti(-34, 1, -17);
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shrtesti( 3400, 1, 1700);
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shrtesti(-3400, 1, -1700);
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shrtesti( -1, 15, -1);
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shrtesti(32767, 15, 0);
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shrtesti( -1, 14, -1);
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shrtesti(32767, 14, 1);
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shltesti( -1, 14, -16384);
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shltesti( 1, 14, 16384);
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assert(sieve(200) == 47);
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assert(sieve(1000) == 169);
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long a = 0, b = 0;
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for(long i=0; i<10000; i++)
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{
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assert( 177 * i == a);
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assert(-177 * i == b);
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a += 177;
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b -= 177;
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}
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long c = 0, d = 0;
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for(long i=0; i<177; i++)
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{
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assert( 10000 * i == c);
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assert(-10000 * i == d);
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c += 10000;
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d -= 10000;
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}
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return 0;
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}
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