Лекция 2 2017 Численные типы данных, массивы, указатели (Лекции (2017))
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ࡏфӐӌӍҺӝ ӎӏӍһӏҸӋӋӄӏӍҺҸӌӄӨсҿӈӗӄӨ ॏ ߞࡈ ߞ ӋҸӏӑҸ ߞߜߝߣ һࡏࡏhttp://xkcd.com/571ࡏкӌҸӈӍӋӐӑҺӍџ ࡴ бӊҸҾӄӋӄӏ бӊҸҾӄӋӄӏӍҺӄӖ хҸӏӔӄӌҿӌӈӍࡈࡄ ҹҸӈҸӊҸҺӏ ӔӄӃӄӈӄ ыыࡈ ӋҸһӄӐӑӏ ӋҸӑҿӋҸӑӄӈӄ ттыࡈࡄ ӎӏӍӔҿӐӐӄӍӌҸӊӛӌӝӅ ӎӏӍһӏҸӋӋӄӐӑ CʾżƚȀɯǞȩɟࡈࡄ ӏҿһӒӊӨӏӌӍ ӖҿӋӒࡷӑӍ ӒӖӒ ыыࡈ Яышлࡈ ся ытяࡏпӍӌӑҸӈӑࡇ ʲȀŏƇǞȒǞɟࡏɔŏɟ˙ȘƚȘǺȩॅǃȒŏǞȀࡏżȩȒߞࡏюҿӊӍӖӄӐӊҿӌӌӝҿ ӑӄӎӝ ҾҸӌӌӝӕࡏࡏеҺӍӄӖӌҸӨ ӐӄӐӑҿӋҸ ӐӖӄӐӊҿӌӄӨчҸӋӝӅ ӎӏӍӐӑӍӅ ӋҿӑӍҾ ӃҸӎӄӐӄ ӖӄӐҿӊࡈ ӄӐӎӍӊӛӃӒӧәӄӅ ӑӍӊӛӈӍ ҾҺҿ ӗӄӔӏӝࡇ ߜ ӄ ߝࡏч ӎӍӋӍәӛӧ ȗ ӔӓӉӊӝӊӋ ӋӍӂӌӍ ӃҸӎӄӐҸӑӛ ߞȗ ӖӄӐҿӊࡏ000ߞ = ߜ,100ߞ = ߠ,001ߞ = ߝ,101ߞ = ߡ,010ߞ = ߞ,110ߞ = ߢ,011ߞ = ߟ,111ߞ = ߣ.ߠࡏэӄӐӊҸ Һ ӎҸӋӨӑӄ ӈӍӋӎӛӧӑҿӏҸߝ ҿҾӋӗ ӐӍӐӑӍӄӑ ӄӃ ߤ ҿӊӗ ӄ ӋӍӂҿӑ ӈӍҾӄӏӍҺҸӑӛ ߞߤ = ߞߡߢ ӏҸӃӊӄӖӌӝӕ ӖӄӐҿӊࡏуҸӎӏӄӋҿӏࡈ ӖӄӐӊӍ ߟߟߣ ӈӍҾӄӏӒҿӑӐӨ ӋӄӌӄӋӒӋ ߞ ҹҸӅӑҸӋӄࡇ00000001! "# $ 01010001! "# $ҹӄӑӝ ߝߡ...ߤҹӄӑӝ ߣ...ߜࡄ ߝ ҹҸӅӑ ߤ ҹӄӑ ӈӍҾӄӏӒҿӑ ߞߡߢ ӖӄӐҿӊࡈࡄ ߞ ҹҸӅӑҸ ߝߢ ҹӄӑ ӈӍҾӄӏӒӧӑ ߢߡ ߡߟߢ ӖӄӐҿӊࡈࡄ ߠ ҹҸӅӑҸ ߟߞ ҹӄӑҸ ӈӍҾӄӏӒӧӑ ߠ ߞߥߠ ߥߢߣ ߞߥߢ ӖӄӐҿӊࡈࡄ ߤ ҹҸӅӑ ߢߠ ҹӄӑҸ ӈӍҾӄӏӒӧӑ ߝߤ ߠߠߢ ߣߠߠ ߜߣߟ ߣߜߥ ߡߡߝ ߢߝߢ ӖӄӐҿӊࡏߡࡏюҿӊӍӖӄӐӊҿӌӌӝҿ ӑӄӎӝ Һ +шӄӎunsigned charunsigned shortunsigned intunsigned long longsigned charshortintlong longцҸӃӋҿӏࡈ ҹӄӑ߸߱߶߲߳߶ߴ߸߱߶߲߳߶ߴтӄӌӄӋӒӋ߰߰߰߰−ߝߞߤ−ߟߞ ߣߢߤ−ߞ ߝߠߣ ߠߤߟ ߢߠߤ−ߥ,ߞ · ߝߜߝߤтҸӈӐӄӋӒӋߞߡߡߢߡ ߡߟߡߠ ߞߥߠ ߥߢߣ ߞߥߡߝߤ,ߠ · ߝߜߝߤߝߞߣߟߞ ߣߢߣߞ ߝߠߣ ߠߤߟ ߢߠߣߥ,ߞ · ߝߜߝߤߢࡏчӊӍӂҿӌӄҿ ӗҿӊӝӕ ӖӄӐҿӊ Ӑ ӎҿӏҿӎӍӊӌҿӌӄҿӋцҸӐӐӋӍӑӏӄӋ ӐӊӍӂҿӌӄҿ ҾҺӒӕ ߤࡷҹӄӑӌӝӕ ҹҿӃӃӌҸӈӍҺӝӕ ӖӄӐҿӊߞߡߜ + ߥ = 1111 1010ߞ + 0000 1001ߞ = .
. .1111 10100000 10011 !0000"#0011$+ߤ ҹӄӑч ӑӍӖӈӄ ӃӏҿӌӄӨ ӈӍӋӎӛӧӑҿӏҸࡇ ߞߡߜ + ߥ = 0000 0011ߞ = ߟࡏߣࡏбӄҾӝ ӎҿӏҿӎӍӊӌҿӌӄӨ ӗҿӊӝӕ ӖӄӐҿӊаҿӃӃӌҸӈӍҺӝҿ ߤࡷҹӄӑӌӝҿࡇࡄ ߞߡߡ + ߝ = ߜࡈࡄ ߜ − ߝ = ߞߡߡࡏкӌҸӈӍҺӝҿ ߤࡷҹӄӑӌӝҿࡇࡄ ߝߞߣ + ߝ = −ߝߞߤࡈࡄ −ߝߞߤ − ߝ = ߝߞߣࡏߤࡏCɔǞż _ŏǞȀɯࡄ ߝߟ ӄӧӌӨ ߞߜߜߥ һࡏ ࡴ ÷ʶǞɾɾƚɟࡇ ӎӍӏӨҾӈӍҺӝӅ ӌӍӋҿӏ ӑҺӄӑӍҺ ӎҿӏҿӎӍӊӌӄӊߟߞࡷҹӄӑӌӍҿ ӃӌҸӈӍҺӍҿ ӗҿӊӍҿࡏࡄ ߞߞ ӐҿӌӑӨҹӏӨ ߞߜߜߥ һࡏ ࡴ ÷ʶǞɾɾƚɟࡇ ӎӍӏӨҾӈӍҺӝӅ ӌӍӋҿӏ ӑҺӄӑӍҺ ӎҿӏҿӎӍӊӌӄӊߟߞࡷҹӄӑӌӍҿ ҹҿӃӃӌҸӈӍҺӍҿ ӗҿӊӍҿࡏࡄ ߥ ӔҿҺӏҸӊӨ ߞߜߝߟ һࡏ ࡴ °ɔƚȘëɾɟƚƚɾŏɔࡇ ӎӍӏӨҾӈӍҺӝӅ ӌӍӋҿӏ ӑӍӖҿӈ ӌҸ ӈҸӏӑҿӎҿӏҿӎӍӊӌӄӊ ߟߞࡷҹӄӑӌӍҿ ӃӌҸӈӍҺӍҿ ӗҿӊӍҿࡏࡄ ߝ ҾҿӈҸҹӏӨ ߞߜߝߠ һࡏ ࡴ Įȩʕ÷ʕųƚࡇ ӈӍӊӄӖҿӐӑҺӍ ӎӏӍӐӋӍӑӏӍҺ ӍҾӌӍһӍ ҺӄҾҿӍӎҿӏҿӎӍӊӌӄӊӍ ߟߞࡷҹӄӑӌӍҿ ӃӌҸӈӍҺӍҿ ӗҿӊӍҿࡏࡄ ߞߜ ӨӌҺҸӏӨ ߞߜߝߣ һࡏ ࡴ +ȩƇƚࡏȩɟǃࡇ ӄҾҿӌӑӄӔӄӈҸӑӍӏ ӐӑӒҾҿӌӖҿӐӈӄӕ ӏҸҹӍӑӎҿӏҿӎӍӊӌӄӊ ߟߞࡷҹӄӑӌӍҿ ҹҿӃӃӌҸӈӍҺӍҿ ӗҿӊӍҿࡏߥࡏбҿәҿӐӑҺҿӌӌӝҿ ӑӄӎӝ ҾҸӌӌӝӕࡏࡏэӄӐӊҸ Ӑ ӎӊҸҺҸӧәҿӅ ӑӍӖӈӍӅһҾҿࡇʺ = ȑ · ųƙ ,ࡄ ȑ ࡴ ӑҾӒӗӊӖӖҾ ӃӌҸӖҸәҸӨ ӖҸӐӑӛࡈࡄ ų ࡴ ӓӖӒӓӀҾӒӊӅ ӖӗӅӔӅӒӊ ӍҹӝӖӌӍ ߞ ӄӊӄ ߝߜࡈࡄ ƙ ࡴ ӨӎӖӔӓӒӅӒӗҾ ӎӍӏӨҾӍӈࡏߝߝࡏэӄӐӊҸ Ӑ ӎӊҸҺҸӧәҿӅ ӑӍӖӈӍӅ Һ +шӄӎfloatdoubleтӄӌࡏ ҸҹӐࡏ ӃӌҸӖҿӌӄҿߝ,ߝߤ · ߝߜ−ߟߤߞ,ߞߟ · ߝߜ−ߟߜߤтҸӈӐࡏ ҸҹӐࡏ ӃӌҸӖҿӌӄҿߟ,ߠߜ · ߝߜߟߤߝ,ߤߜ · ߝߜߟߜߤшӍӖӌӍӐӑӛࡈ ҾҿӐࡏ ӃӌҸӈӍҺ≈ߣ≈ ߝߢߝߞࡏфӐӍҹҿӌӌӝҿ ӖӄӐӊҸэӄӐӊҸ ±ߜࡈ ±∞Ȁȩǃ(ߜ) = −∞,ߝ/(+ߜ) = +∞,ߝ/(−ߜ) = −∞.уҿࡷӖӄӐӊҸ ŏࡈ ȩɾ ŏ ʕȒųƚɟࡇ√ŏ = −ߝ, ߜ/ߜ, ߜ · ∞, ∞/∞, ∞ − ∞,ߝߟࡏхӏӍҹӊҿӋӝ Ӑ ӑӍӖӌӍӐӑӛӧࡄ фӈӏӒһӊҿӌӄҿࡇ ɾǃ(π) ̸= ߜ, ɾǃ(π/ߞ) ̸= ∞ࡏࡄ уҸӈӍӎӊҿӌӄҿ ӍӘӄҹӍӈࡇ ŏ + (ų + ż) ̸= (ŏ + ų) + żࡏࡄ хӍӑҿӏӨ ӑӍӖӌӍӐӑӄࡇ ŏ − ųࡈ ҿӐӊӄ ŏ ≈ ųࡏࡄ хӍӑҿӏӨ ӑӍӖӌӍӐӑӄࡇ ŏ + ųࡈ ҿӐӊӄ ŏ ≫ ų ӄӊӄ ŏ ≪ ųࡏࡄ чӏҸҺӌҿӌӄҿ ӖӄӐҿӊࡏߝߠࡏтҸӐӐӄҺӝࡏࡏфҹӜӨҺӊҿӌӄҿ ӋҸӐӐӄҺҸтҸӐӐӄҺ ࡴ ӒӎӍӏӨҾӍӖҿӌӌӝӅ ӌҸҹӍӏ ӢӊҿӋҿӌӑӍҺ ӍҾӌӍһӍ ӑӄӎҸࡏфҹӜӨҺӊҿӌӄҿ ӋҸӐӐӄҺҸ arrࡈ ӐӍӐӑӍӨәҿһӍ ӄӃ N ӢӊҿӋҿӌӑӍҺ ӎӏӍӄӃҺӍӊӛӌӍһӍ ӑӄӎҸ TࡇT arr[N];һҾҿ N ࡴ ӈӍӌӐӑҸӌӑҸ ҺӏҿӋҿӌӄ ӈӍӋӎӄӊӨӗӄӄࡏхӏӄӋҿӏ ӍҹӜӨҺӊҿӌӄӨ ӄ ӄӌӄӗӄҸӊӄӃҸӗӄӄ ӋҸӐӐӄҺҸࡇint xs[4];// {?, ?, ?, ?}int ys[] = {20, 10}; // {20, 10}int zs[4] = {20, 10}; // {20, 10, 0, 0}ߝߢࡏеӍӐӑӒӎ ӈ ӢӊҿӋҿӌӑҸӋ ӋҸӐӐӄҺҸT arr[N]ࡇࡏࡏࡏ0ࡏ1ࡏࡏࡏࡏࡏࡏࡊࡏࡏࡏN-1эӑҿӌӄҿ ӢӊҿӋҿӌӑҸ ӄӃ ӋҸӐӐӄҺҸ ӎӍ ӄӌҾҿӈӐӒ iࡇT value = arr[i];кҸӎӄӐӛ ӢӊҿӋҿӌӑҸ Һ ӋҸӐӐӄҺ ӎӍ ӄӌҾҿӈӐӒ iࡇarr[i] = new_value;ߝߣࡏщӈҸӃҸӑҿӊӄࡏࡏщӈҸӃҸӑҿӊӛ ӈҸӈ ҸҾӏҿӐߡߝߤࡏ0x20int x = 518;int y = 320;ߟߞߜ0x230x400x43int* ptr;// & - взятие адреса// * - разыменование указателяptr = &x;printf("%p %d\n", ptr, *ptr); // 0x20 518ptr = &y;printf("%p %d\n", ptr, *ptr); // 0x40 320ߝߥࡏщӈҸӃҸӑҿӊӛ ӈҸӈ ҸҾӏҿӐߥߥߥߡߝߤࡏ0x20int x = 518;int y = 320;0x230x400x43int* ptr;// & - взятие адреса// * - разыменование указателяptr = &x;printf("%p %d\n", ptr, *ptr); // 0x20 518ptr = &y;printf("%p %d\n", ptr, *ptr); // 0x40 320*ptr = 999;printf("%d %d\n", x, y); // 518 999ߝߥࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߟߜ0x200x220x24short a[3] = {10, 20, 30};short* p = &(a[0]); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x24ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߟߜ0x20short a[3] = {10, 20, 30};0x220x24*p1 = 200;short* p = &(a[0]); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x24ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߞߟߜ0x20short a[3] = {10, 20, 30};0x220x24*p1 = 200;*p2 = *p1 + *p2;short* p = &(a[0]); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x24ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߞߟߜ0x20short a[3] = {10, 20, 30};0x220x24*(p+1) = 200;*(p+2) = *(p+1) + *(p+2);short* p = &(a[0]); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x24ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߞߟߜ0x20short a[3] = {10, 20, 30};short* p = &(a[0]); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x240x220x24p[1] = 200;p[2] = p[1] + p[2];// *(x + y) == x[y]ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߞߟߜ0x20short a[3] = {10, 20, 30};short* p = &(*(a)); // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x240x220x24p[1] = 200;p[2] = p[1] + p[2];// *(x + y) == x[y]ߞߜࡏтҸӐӐӄҺӝ ӄ ӒӈҸӃҸӑҿӊӄࡏa[0]a[1]a[2]ߝߜߞߜߜߞߟߜ0x20short a[3] = {10, 20, 30};short* p = a; // 0x20short* p1 = p + 1; // 0x22short* p2 = p + 2; // 0x240x220x24p[1] = 200;p[2] = p[1] + p[2];// *(x + y) == x[y]ߞߜࡏфӐӑҸӊӛӌӍҿ ӌҿ ҺӊҿӃӊӍ Һ ӎҸӏӒࡊߞߝࡏщӈҸӃҸӑҿӊӛࡈ ӌӄӈӒҾҸ ӌҿ ӒӈҸӃӝҺҸӧәӄӅNULL ࡴ ӐӎҿӗӄҸӊӛӌӍҿ ӈӍӌӐӑҸӌӑӌӍҿ ӃӌҸӖҿӌӄҿࡈ ӐӄӋҺӍӊӄӃӄӏӒӧәҿҿࡈ ӖӑӍӒӈҸӃҸӑҿӊӛ ӌҿ ӒӈҸӃӝҺҸҿӑ ӌӄ ӌҸ ӈҸӈӍӅ ӢӊҿӋҿӌӑ ӎҸӋӨӑӄࡏ фҹӜӨҺӊҿӌӍ ҺӃҸһӍӊӍҺӍӖӌӍӋ ӔҸӅӊҿ stdlib.hࡏint* ptr = NULL;int value = *ptr; // run time error*ptr = 37; // run time errorцҸӃӌӝҿ ӌҸӃҺҸӌӄӨࡈ ӌӍ ӐӒӑӛ ӍҾӌҸ ɯƚǃȒƚȘɾŏɾǞȩȘ ǀŏʕȀɾࡈ ɯƚǃǀŏʕȀɾࡈ ŏżżƚɯɯ ʲǞȩȀŏɾǞȩȘࡈࢀхӏӍһӏҸӋӋҸ ҺӝӎӍӊӌӄӊҸ ӌҿҾӍӎӒӐӑӄӋӒӧ ӍӎҿӏҸӗӄӧࡊࢁࡈ ࡊࡏߞߞࡏщӈҸӃҸӑҿӊӛࡈ ӒӈҸӃӝҺҸӧәӄӅ ӕӍӑӛ ӈӒҾҸvoid* ࡴ ӐӎҿӗӄҸӊӛӌӝӅ ӑӄӎ ӒӈҸӃҸӑҿӊӨࡈ ӈӍӑӍӏӝӅ ӋӍӂҿӑ ӒӈҸӃӝҺҸӑӛ ӌҸ ӊӧҹӍӅҸҾӏҿӐ Һ ӎҸӋӨӑӄࡏ тӍӂҿӑ ҹӝӑӛ ӎӏӄҺҿҾҿӌ ӈ ӊӧҹӍӋӒ ҾӏӒһӍӋӒ ӑӄӎӒ ӒӈҸӃҸӑҿӊҿӅ ӄӍҹӏҸӑӌӍࡏdouble x = 37;double* px = &x;void* p = px;int* py = p;тӄӌӒӑӈҸ ӔӄӊӍӐӍӔӄӄࡇ ࢀпҸӈӍҺҸ ӎӏӄӏӍҾҸ ʲȩǞƇࡐࢁ ࡴ ӐӎӏӍӐӄӊ ӒӖӄӑҿӊӛࡈ ࡊߞߟࡏеӄӌҸӋӄӖҿӐӈҸӨ ӎҸӋӨӑӛࡏࡏхӏҿӄӋӒәҿӐӑҺҸ ҾӄӌҸӋӄӖҿӐӈӍӅ ӎҸӋӨӑӄࡄ бӝҾҿӊӨҿӑӐӨ ӄ ӍӐҺӍҹӍӂҾҸҿӑӐӨ ҾӄӌҸӋӄӖҿӐӈӄ ӎӍ ӃҸӎӏӍӐӒ ӎӏӍһӏҸӋӋӝࡏࡄ цҸӃӋҿӏ ӃҸҾҸҿӑӐӨ ҾӄӌҸӋӄӖҿӐӈӄࡏߞߡࡏбӝҾҿӊҿӌӄҿ ҹӊӍӈҸ ӎҸӋӨӑӄvoid* malloc(size_t size);ыӒӌӈӗӄӨ ҺӝҾҿӊӨҿӑ ҹӊӍӈ ӎҸӋӨӑӄ ӏҸӃӋҿӏӍӋ size ҹҸӅӑ ӄ ҺӍӃҺӏҸәҸҿӑ ӒӈҸӃҸӑҿӊӛӌҸ ӌҸӖҸӊӍ ҹӊӍӈҸࡏ б ӐӊӒӖҸҿࡈ ҿӐӊӄ ӎҸӋӨӑӛ ҺӝҾҿӊӄӑӛ ӌҿ ӎӍӊӒӖӄӊӍӐӛࡈ ҺӍӃҺӏҸәҸҿӑNULLࡏ фҹӜӨҺӊҿӌҸ Һ ӃҸһӍӊӍҺӍӖӌӍӋ ӔҸӅӊҿ stdlib.hࡏߞߢࡏфӐҺӍҹӍӂҾҿӌӄҿ ҹӊӍӈҸ ӎҸӋӨӑӄvoid free(void* ptr);ыӒӌӈӗӄӨ ӍӐҺӍҹӍӂҾҸҿӑ ҹӊӍӈ ӎҸӋӨӑӄࡏ жӐӊӄ ptr ӏҸҺҿӌ NULLࡈ ӌӄӖҿһӍ ӌҿ ҾҿӊҸҿӑࡏфҹӜӨҺӊҿӌҸ Һ ӃҸһӍӊӍҺӍӖӌӍӋ ӔҸӅӊҿ stdlib.hࡏхӍӐӊҿ ҺӝӃӍҺҸ ӃӌҸӖҿӌӄҿ ӒӈҸӃҸӑҿӊӨ ptr ӍӐӑҸҿӑӐӨ ӎӏҿӂӌӄӋࡈ ӌӍӏҸӃӝӋҿӌӍҺӝҺҸӑӛ ҿһӍ ӌҿӊӛӃӨࡏуҿӄӐӎӍӊӛӃӒҿӋӒӧ ӎҸӋӨӑӛ ӌӒӂӌӍ ӍҹӨӃҸӑҿӊӛӌӍ ӍӐҺӍҹӍӂҾҸӑӛࡈ ӄӌҸӖҿ ӏҸӌӍ ӄӊӄӎӍӃҾӌӍ ӍӌҸ ӋӍӂҿӑ ӈӍӌӖӄӑӛӐӨ ӒӑҿӖӈҸ ӎҸӋӨӑӄࡏߞߣࡏхӏӄӋҿӏࡇ ӋҸӐӐӄҺ ҾӄӌҸӋӄӖҿӐӈӍһӍ ӏҸӃӋҿӏҸࡏint n = read_number(); // 5int* p; // ???ߞߤࡏхӏӄӋҿӏࡇ ӋҸӐӐӄҺ ҾӄӌҸӋӄӖҿӐӈӍһӍ ӏҸӃӋҿӏҸࡏࡐࡐࡐࡐࡐࡐࡐࡐࡐ0x100ࡐࡐࡐࡐࡐࡐ0x113int n = read_number(); // 5int* p; // 0x100p = malloc(n * sizeof(int));if (p == NULL) { /* error */ }ߞߤࡏхӏӄӋҿӏࡇ ӋҸӐӐӄҺ ҾӄӌҸӋӄӖҿӐӈӍһӍ ӏҸӃӋҿӏҸࡏߟߣࡐࡐࡐ0x100ߟߣࡐࡐࡐߟߣ0x113int n = read_number(); // 5int* p; // 0x100p = malloc(n * sizeof(int));if (p == NULL) { /* error */ }p[0] = p[n/2] = p[n-1] = 37;ߞߤࡏхӏӄӋҿӏࡇ ӋҸӐӐӄҺ ҾӄӌҸӋӄӖҿӐӈӍһӍ ӏҸӃӋҿӏҸࡏࡐࡐࡐࡐࡐࡐࡐࡐࡐ0x100ࡐࡐࡐࡐࡐࡐ0x113int n = read_number(); // 5int* p; // 0x100p = malloc(n * sizeof(int));if (p == NULL) { /* error */ }p[0] = p[n/2] = p[n-1] = 37;free(p);ߞߤࡏпӍӌҿӗ ҺӑӍӏӍӅ ӊҿӈӗӄӄߞߥ.
