因为rand产生的随机数从0到rand_max,而rand_max是一个非常大的数,那么怎样产生从X~Y的数呢? 从X到Y。有Y-X+1个数,所以要产生从X到Y的数。仅仅须要这样写: k=rand()%(Y-X+1)+X; 这样,就能够产生你想要的不论什么范围内的随机数了。
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../bearssl/[rand, ec] {.used.} type EcPrivateKey* = ref object buffer*: array[EC_KBUF_PRIV_MAX_SIZE, byte] key*: ec.EcPrivateKey suite "ec": test "test ecKeygen interface": let rng = HmacDrbgContext.new() var ecimp = ecGetDefault() var res = new EcPrivateKey check ecKeygen...
Copying file m4/intldir.m4 Copying file m4/intmax.m4 Copying file m4/inttypes-pri.m4 Copying file m4/printf-posix.m4 Copying file m4/uintmax_t.m4 Copying file po/Makefile.in.in Copying file po/Makevars.template autoreconf: running: aclocal --force -I m4 autoreconf: configure.ac: tracing...
x = rand() * 1.0 / RAND_MAX; y = rand() * 1.0 / RAND_MAX; if (InCircle(x,y)) num ++ ; } cout << " PI: " << (num * 4.0 ) / COUNT << endl; } 结果:測试5次的结果显示:3.13958,3.14041,3.13729,3.13859,3.14186。
优化的方法不一而足，总体上将有以下几类：1）精简操作指令；2）尽量满足 cpu 的流水操作；3）通过对...
for (Matrix::size_type i=0; i<MAX_ROW; ++i) { for (Matrix::size_type j=0; j<MAX_COL; ++j) { A(i, j) = Matrix::value_type(rand() % 50); } } // fill Matrix B with the iterator syntax for (Matrix::iterator i=B.begin(); i!=B.end(); ++i) ...
(double)rand()/RAND_MAX;for(inti=0;i<line2*column2;i++)matrix_2[i]=(double)rand()/RAND_MAX;clock_tstart,end;start=clock();Better_Matrix_multiplication(matrix_1,matrix_2,output_matrix,line1,colummn1,line2,column2);end=clock();doubleduration=((double)(end-start))/CLOCKS_PER_SEC;...
GCC会自动为您的原始代码使用SIMD。你的手动优化只是抑制了编译器的优化。使用-O3 -march=skylake -f...
The `rand' and `srand' functions are required by the ANSI standard.We provide both interfaces to the same random number generator. */ /* Return a random long integer between 0 and RAND_MAX inclusive. */ extern long int random (void) __THROW; /* Seed the random number generator ...