📄 printf.3
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1997(of)S2106(following)S2522(\257ags:)S4656 V10 Y11440(d)S10 R1800(a)S1874(`#')S2021(character)S2421(specifying)S2869(that)S3049(the)S3201(value)S(should)267 3448 A3744(be)S(converted)397 3868 A4294(to)S4401(an)S4526(``alternate)S4972(form''.)S4776 V1800(For)S10 B1967(c)S10 R2012(,)S10 B2064(d)S10 R2120(,)S10 B2172(s)S10 R2211(,)S2263(and)S10 B2435(u)S10 R(conversions,)505 2518 A3050(this)S3222(option)S3505(has)S3666(no)S3793(effect.)S4101(For)S10 B4268(o)S10 R(conversions,)505 4345 A4876(the)S5025(preci-)S4896 V1800(sion)S2003(of)S2123(the)S2282(number)S2625(is)S2728(increased)S3145(to)S3259(force)S3503(the)S3662(\256rst)S3855(character)S4262(of)S4382(the)S4542(output)S4835(string)S5101(to)S5216(a)S5016 V1800(zero.)S2060(For)S10 B2236(x)S10 R2286(\()S10 B2320(X)S10 R2393(\))S(conversion,)466 2463 A2964(a)S(non-zero)358 3044 A3437(result)S3696(has)S3865(the)S4023(string)S10 B4287(0x)S10 R4387(\()S10 B4421(0X)S10 R4544(\))S4613(prepended)S5067(to)S5180(it.)S5136 V1800(For)S10 B1967(e)S10 R2012(,)S10 B2064(E)S10 R2131(,)S10 B2183(f)S10 R2217(,)S10 B2269(g)S10 R2319(,)S2371(and)S10 B2543(G)S10 R(conversions,)505 2648 A3180(the)S3330(result)S(will)157 3581 A3765(always)S4072(contain)S4395(a)S4467(decimal)S4813(point,)S5071(even)S5256 V1800(if)S1893(no)S2024(digits)S2278(follow)S2572(the)S2726(point)S2963(\(normally,)S3416(a)S3492(decimal)S3841(point)S4077(only)S4285(appears)S4623(in)S4731(the)S4884(results)S5177(of)S5376 V1800(those)S(conversions)480 2052 A2572(if)S2674(a)S2759(digit)S2983(follows)S3325(the)S3488(decimal)S3848(point\).)S4179(For)S10 B4360(g)S10 R4451(and)S10 B4637(G)S10 R(conversions,)505 4756 A5496 V(trailing)291 1800 A2116(zeros)S2354(are)S2503(not)S2656(removed)S3033(from)S3254(the)S3402(result)S3651(as)S3760(they)S3958(would)S4234(otherwise)S4651(be.)S5664 V10 Y11440(d)S10 R1800(a)S1880(minus)S2161(sign)S2364(`)S10 R-12398(-)S10 R2455(')S2525(which)S2807(speci\256es)S10 I3190(left)S3355(adjustment)S10 R3832(of)S3952(the)S(converted)397 4111 A4544(value)S4798(in)S4912(the)S5071(indi-)S5784 V1800(cated)S2038(\256eld;)S5952 V10 Y11440(d)S10 R1800(a)S1895(`+')S2070(character)S2491(specifying)S2960(that)S3161(there)S(should)267 3413 A3730(always)S4060(be)S4205(a)S4300(sign)S(placed)263 4517 A4830(before)S5138(the)S6072 V1800(number)S2132(when)S2375(using)S2617(signed)S(conversions.)505 2904 A6240 V10 Y11440(d)S10 R1800(a)S(space)224 1889 A2157(specifying)S2620(that)S2815(a)S2904(blank)S(should)267 3171 A3482(be)S3621(left)S3801(before)S4104(a)S(positive)318 4194 A4557(number)S4909(during)S5216(a)S6360 V1800(signed)S(conversion.)466 2087 A2603(A)S2701(`+')S2851(overrides)S3251(a)S(space)224 3321 A3570(if)S3657(both)S3860(are)S4009(used.)S6528 V10 Y11080(d)S10 R1440(an)S1571(optional)S1936(digit)S2156(string)S2422(specifying)S2878(a)S10 I2960(\256eld)S3170(width;)S10 R3464(if)S3563(the)S(converted)397 3723 A4157(value)S4412(has)S4583(fewer)S4851(characters)S6648 V1440(than)S1640(the)S1790(\256eld)S1995(width)S2250(it)S(will)157 2332 A2515(be)S2636(blank-padded)S3209(on)S3335(the)S3484(left)S3645(\(or)S3789(right,)S4030(if)S4118(the)S4267(left-adjustment)S4903(indicator)S6768 V1440(has)S1602(been)S1820(given\))S2105(to)S2211(make)S2457(up)S2585(the)S2736(\256eld)S2943(width;)S3228(if)S3318(the)S3469(\256eld)S3676(width)S3933(begins)S4223(with)S4430(a)S4503(zero,)S4730(zero-padding)S6888 V(will)157 1440 A1622(be)S(done)195 1742 A1962(instead)S2272(of)S2381(blank-padding;)S7056 V10 Y11080(d)S10 R1440(an)S1560(optional)S1914(period)S2196(`)S10 B2230(.)S10 R2255(')S2339(which)S2610(serves)S2887(to)S2990(separate)S3346(the)S3494(\256eld)S3698(width)S3952(from)S4173(the)S4321(next)S4519(digit)S4728(string;)S7224 V10 Y11080(d)S10 R1440(an)S1568(optional)S1930(digit)S2147(string)S2409(specifying)S2861(a)S10 I2939(precision)S10 R3346(which)S3626(speci\256es)S4007(the)S4164(number)S4505(of)S4623(digits)S4880(to)S4992(appear)S7344 V1440(after)S1660(the)S1817(decimal)S2170(point,)S2434(for)S2585(e-)S2697(and)S(f-conversion,)534 2875 A3442(or)S3559(the)S3715(maximum)S4155(number)S4495(of)S4612(characters)S5055(to)S5166(be)S7464 V1440(printed)S1750(from)S1971(a)S2041(string;)S7903 V720(Page)S941(1)S2694(\()S2736(June)S2945(5,)S(1986)200 3045 A3253(\))S4455(September)S4911(13,)S(1996)200 5061 A8143 VEP%%Page: 2 2BP/slant 0 def/height 0 def480 V10 R720(PRINTF)S1076(\()S1118(3)S1176(\))S2696(Eighth)S(Edition)296 2989 A4771(PRINTF)S5127(\()S5169(3)S5227(\))S960 V10 Y11080(d)S10 R1440(the)S1588(character)S10 B1984(l)S10 R2037(specifying)S2481(that)S2657(a)S2727(following)S10 B3143(d)S10 R3199(,)S10 B3249(o)S10 R3299(,)S10 B3349(x)S10 R3399(,)S3449(or)S10 B3558(u)S10 R(corresponds)486 3639 A4150(to)S4253(a)S(long)178 4323 A4526(integer)S10 I4831(arg)S10 R4978(.)S1128 V10 Y11080(d)S10 R1440(a)S1510(character)S1906(which)S2177(indicates)S2560(the)S2708(type)S2906(of)S(conversion)441 3015 A3481(to)S3584(be)S3704(applied.)S1296 V1080(A)S1183(\256eld)S1392(width)S1651(or)S1765(precision)S2164(may)S2368(be)S2494(`*')S2643(instead)S2959(of)S3074(a)S3150(digit)S3365(string.)S3675(In)S3790(this)S3966(case)S4171(an)S4297(integer)S10 I4608(arg)S10 R(supplies)329 4778 A5138(the)S1416 V1080(\256eld)S1284(width)S1538(or)S1647(precision.)S1584 V1080(The)S(conversion)441 1262 A1728(characters)S2163(and)S2333(their)S2543(meanings)S2953(are)S1752 V10 B1080(dox)S10 R1440(The)S1622(integer)S10 I1927(arg)S10 R2091(is)S(converted)397 2183 A2605(to)S2708(decimal,)S3077(octal,)S3323(or)S3432(hexadecimal)S3966(notation)S4320(respectively.)S1920 V10 B1080(X)S10 R1440(Like)S10 B1650(x)S10 R1700(,)S1750(but)S1903(use)S(upper)229 2062 A2316(case)S2515(instead)S2825(of)S2934(lower)S3189(case.)S2088 V10 B1080(f)S10 R1440(The)S1631(\257oat)S1844(or)S(double)273 1962 A10 I2269(arg)S10 R2442(is)S(converted)397 2544 A2976(to)S3089(decimal)S3443(notation)S3807(in)S3920(the)S4078(style)S4303(`[)S10 B-14371(-)S10 R(]ddd.ddd')393 4428 A4856(where)S5138(the)S2208 V1440(number)S1778(of)S1893(d's)S2047(after)S2264(the)S2418(decimal)S2768(point)S3005(is)S3103(equal)S3352(to)S3461(the)S3615(precision)S4015(speci\256cation)S4555(for)S4703(the)S4856(argument.)S2328 V1440(If)S1539(the)S1693(precision)S2093(is)S2191(missing,)S2559(6)S2640(digits)S2894(are)S3049(given;)S3331(if)S3424(the)S3578(precision)S3979(is)S(explicitly)380 4078 A4490(0,)S4597(no)S4729(digits)S4984(and)S5161(no)S2448 V1440(decimal)S1784(point)S2015(are)S2164(printed.)S2616 V10 B1080(e)S10 R1440(The)S1622(\257oat)S1826(or)S(double)273 1935 A10 I2234(arg)S10 R2399(is)S(converted)397 2492 A2915(in)S3019(the)S3168(style)S3384(`[)S10 B-13452(-)S10 R3509(]d)S10 B3593(.)S10 R(ddd)150 3618 A10 B3768(e)S10 Y3813(\261)S10 R3868(dd')S4028(where)S4301(there)S4529(is)S4622(one)S4793(digit)S5003(before)S2736 V1440(the)S1590(decimal)S1936(point)S2169(and)S2341(the)S2491(number)S2825(after)S3038(is)S3132(equal)S3377(to)S3481(the)S3630(precision)S4025(speci\256cation)S4560(for)S4704(the)S4853(argument;)S2856 V1440(when)S1683(the)S1831(precision)S2225(is)S2317(missing,)S2679(6)S2754(digits)S3002(are)S(produced.)399 3151 A3024 V10 B1080(g)S10 R1440(The)S1623(\257oat)S1828(or)S(double)273 1938 A10 I2237(arg)S10 R2402(is)S2495(printed)S2806(in)S2910(style)S10 B3126(d)S10 R3182(,)S3234(in)S3339(style)S10 B3556(f)S10 R3590(,)S3642(or)S3753(in)S3858(style)S10 B4075(e)S10 R4120(,)S4172(whichever)S4619(gives)S4858(full)S5025(preci-)S3144 V1440(sion)S1632(in)S1735(minimum)S(space.)249 2150 A3312 V10 B1080(c)S10 R1440(The)S1622(character)S10 I2018(arg)S10 R2182(is)S2274(printed.)S3480 V10 B1080(s)S10 I1440(Arg)S10 R1618(is)S1712(taken)S1957(to)S2063(be)S2186(a)S2259(string)S2516(\(character)S2949(pointer\))S3296(and)S3469(characters)S3907(from)S4131(the)S4282(string)S4539(are)S4691(printed)S(until)184 5004 A5216(a)S3600 V1440(null)S1640(character)S2055(or)S(until)184 2183 A2411(the)S2578(number)S2929(of)S3056(characters)S3509(indicated)S3921(by)S4064(the)S4230(precision)S4642(speci\256cation)S5194(is)S3720 V(reached;)342 1440 A1807(however)S2179(if)S2266(the)S2414(precision)S2808(is)S2900(0)S2975(or)S3084(missing)S3421(all)S3547(characters)S3982(up)S4107(to)S4210(a)S4280(null)S4461(are)S4610(printed.)S3888 V10 B1080(u)S10 R1440(The)S1622(unsigned)S2009(integer)S10 I2314(arg)S10 R2478(is)S(converted)397 2570 A2992(to)S3095(decimal)S3439(and)S3609(printed.)S4056 V10 B1080(%)S10 R1440(Print)S1661(a)S1731(`%';)S1936(no)S2061(argument)S2466(is)S(converted.)422 2558 A4224 V1080(In)S1191(no)S1318(case)S1519(does)S1730(a)S(non-existent)497 1802 A2326(or)S2438(small)S2684(\256eld)S2891(width)S3148(cause)S3400(truncation)S3836(of)S3948(a)S4021(\256eld;)S4256(padding)S4607(takes)S(place)213 4842 A5083(only)S4344 V1080(if)S1181(the)S1343(speci\256ed)S1740(\256eld)S1958(width)S(exceeds)319 2226 A2584(the)S2746(actual)S3026(width.)S3344(Characters)S3815(generated)S4246(by)S10 B4385(printf)S10 R4676(are)S4838(printed)S5161(by)S4464 V10 B1080(putc)S10 R1271(\(3\).)S4632 V10 B1080(Examples)S4752 V10 R1080(To)S1220(print)S1438(a)S1511(date)S1707(and)S1880(time)S2087(in)S2193(the)S2344(form)S(`Sunday,)360 2568 A2956(July)S3151(3,)S3255(10:02',)S3571(where)S10 I(weekday)347 3847 A10 R4223(and)S10 I4397(month)S10 R4677(are)S4830(pointers)S5183(to)S4872 V1080(null-terminated)S1726(strings:)S5040 V1440(printf\("%s,)S1912(%s)S2060(%d,)S(%02d:%02d",)562 2244 A2831(weekday,)S3239(month,)S3545(day,)S(hour,)209 3740 A3974(min\);)S5208 V1080(To)S1217(print)S10 Y1432(p)S10 R1512(to)S1615(5)S1690(decimals:)S5376 V1440(printf\("pi)S1842(=)S1924(%.5f",)S2208(4*atan\(1.0\)\);)S5544 V9 R720(S)S722(SE)S774(EE)S832(E)S913(A)S915(AL)S983(LS)S1041(SO)S1093(O)S5664 V10 B1080(putc)S10 R1271(\(3\),)S10 B1439(scanf)S10 R1663(\(3\),)S10 B1831(ecvt)S10 R2005(\(3\),)S10 B2173(stdarg)S10 R2447(\(3\).)S7903 V720(September)S1176(13,)S(1996)200 1326 A2694(\()S2736(June)S2945(5,)S(1986)200 3045 A3253(\))S4990(Page)S5211(2)S8143 VEP%%Trailer%%DocumentFonts: Times-Roman Times-Bold Times-Italic Symbol Troff%%Pages: 2⌨️ 快捷键说明
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