printf(¡°%d ¡±,x #include printf(¡°Please input a string:¡±); gets(s); /*scanf(¡°%s¡±,s);*/ printf(¡°\\nYou input string is: %s¡±,s); } £¨5£©#include if(k=3) printf(¡°***¡±); else printf(¡°###¡±); } £¨6£©#include { printf(¡°k=%d\\n¡±,k); }while(k++>0); } 2¡¢ÎÊÌ⣺Íê³ÉÒÔÏÂÈý¸ö³ÌÐò£¬·Ö±ðÒÔÎļþÃûA01.c¡¢A02.cºÍA03.c±£´æ£º £¨1£©¶¨ÒåÁ½¸öÕûÐͱäÁ¿x,y£¬ÒªÇóÀûÓÃscanf£¨£©º¯Êý´Ó¼üÅ̶Ôx,y¸³Öµ£¬È»ºóÀûÓÃprintf£¨£©Êä³öÁ½ÕßÖ®ºÍ¡£ £¨2£©¶¨ÒåÁ½¸ö±äÁ¿£ºÕûÐÍx,ʵÐÍy£¬ÒªÇóÀûÓÃscanf£¨£©º¯Êý´Ó¼üÅ̶Ôx,y¸³Öµ£¬È»ºóÀûÓÃprintf£¨£©Êä³öÁ½ÕßÖ®»ý¡£ £¨3£©¶¨ÒåÁ½×Ö·ûÐͱäÁ¿ch1¡¢ch2£¬·Ö±ðÓÃgetchar£¨£©ºÍputchar£¨£©º¯Êý½øÐÐÊäÈëÊä³ö¡£ ÒªÇó£º £¨1£©´Ó¼üÅÌÊäÈëµÄʱºò£¬×¢ÒâÓöàÖÖ·Ö¸ô·ûµÄ·½·¨£» £¨2£©Êä³öʱ£¬¸ñʽ¿ØÖÆÖÐÒª°üº¬Ò»Ð©Ìáʾ×Ö·û¡£ 3¡¢³ÌÐò¸Ä´í ÏÂÃæÊÇÅжÏÒ»¸öѧÉú¿¼ÊԳɼ¨¼°¸ñÓë·ñµÄ³ÌÐò£¨³É¼¨£Á£¬»ò£Â£¬»ò£ÃÕßΪ¼°¸ñ£»³É¼¨Îª£ÄÕß²»¼°¸ñ£©£¬µ÷ÊÔ²¢¸Ä½øÈçϳÌÐòʹÆäÄÜÂú×ãÉÏÊöÊä³öµÄÐèÒª¡£ ££include { char mark=¡°A¡±; switch(mark) { case ¡°A¡±: case ¡°B¡±: case ¡°C¡±: printf(¡°>=60\\n¡±); case ¡°D¡±: printf(¡°<60\\n¡±); default: printf(¡°Error\\n¡±); } } 4¡¢³ÌÐòÉè¼Æ £¨1£©¹¦ÄÜ£º±à³ÌʵÏÖʹʵÐÍÕýÊý±£Áô2λСÊý£¬²¢¶ÔµÚÈýλ½øÐÐËÄÉáÎåÈë¡£ ÀýÈ磺ʵÐÍÊýΪ 1234.567£¬Ôòº¯Êý·µ»Ø 1234.570000£» ʵÐÍÊýΪ 1234.564£¬Ôòº¯Êý·µ»Ø 1234.560000¡£ £¨2£©¹¦ÄÜ£º´Ó¼üÅÌÊäÈëÒ»¸ö´óд×Öĸ£¬ÒªÇó¸ÄÓÃСд×ÖĸÊä³ö¡£ £¨3£©¹¦ÄÜ£º±àдº¯Êý¼ÆËãÏÂÁзֶκ¯ÊýµÄÖµ£º ?x2?x?6x?0ÇÒx?-3?2f(x)??x?5x?60?x?10ÇÒx?2ÇÒx?3 ?x2?x?1ÆäËü?£¨4£©¹¦ÄÜ£ºÅжÏÕûÊýxÊÇ·ñÊÇͬ¹¹Êý¡£ÈôÊÇͬ¹¹Êý£¬º¯Êý·µ»Ø1£»·ñÔò·µ»Ø0¡£xµÄÖµÓÉÖ÷º¯Êý´Ó¼üÅ̶ÁÈ룬ҪÇó²»´óÓÚ100¡£ ˵Ã÷£ºËùν¡°Í¬¹¹Êý¡±ÊÇÖ¸ÕâÑùµÄÊý£¬Õâ¸öÊý³öÏÖÔÚËüµÄƽ·½ÊýµÄÓұߡ£ ÀýÈ磺ÊäÈëÕûÊý5£¬5µÄƽ·½ÊýÊÇ25£¬5ÊÇ25ÖÐÓÒ²àµÄÊý£¬ËùÒÔ5ÊÇͬ¹¹Êý¡£ £¨5£©¹¦ÄÜ£º¼ÆËãÕýÕûÊýnµÄËùÓÐÒò×Ó£¨1ºÍn³ýÍ⣩֮ºÍ²¢Êä³ö¡£nµÄÖµÓɼüÅÌÊäÈë¡£ ÀýÈ磺n=120ʱ£¬Êä³ö239¡£ £¨6£©¹¦ÄÜ£º¼ÆËã²¢Êä³öÏÂÁжàÏîʽµÄÖµ S = 1 + 1/1! + 1/2! + 1/3! + ... + 1/n! ÀýÈ磺¼üÅ̸ønÊäÈë15£¬ÔòÊä³öΪ£ºs=2.718282¡£ ×¢Ò⣺ҪÇónµÄÖµ´óÓÚ1µ«²»´óÓÚ100¡£ £¨7£©¹¦ÄÜ£º´ÓµÍλ¿ªÊ¼È¡³ö³¤ÕûÐͱäÁ¿sÆæÊýλÉϵÄÊý£¬ÒÀ´Î¹¹³ÉÒ»¸öÐÂÊý·ÅÔÚtÖС£ ÀýÈ磺µ±sÖеÄÊýΪ£º7654321ʱ£¬tÖеÄÊýΪ£º7531¡£ 5¡¢Ë¼¿¼Ìâ £¨1£©¹¦ÄÜ£ºÅжÏÒ»¸öÈýλÊýÊÇ·ñ\Ë®ÏÉ»¨Êý\¡£ÔÚmainº¯ÊýÖдӼüÅÌÊäÈëÒ»¸öÈýλÊý£¬²¢Êä³öÅжϽá¹û¡£ ˵Ã÷£ºËùν\Ë®ÏÉ»¨Êý\ÊÇÖ¸Ò»3λÊý£¬Æä¸÷λÊý×ÖÁ¢·½ºÍµÈÓÚ¸ÃÊý±¾Éí¡£ ÀýÈ磺153ÊÇÒ»¸öË®ÏÉ»¨Êý£¬ÒòΪ153=1+125+27¡£ £¨2£©¹¦ÄÜ£º¼ÆËã²¢Êä³ö3µ½nÖ®¼äËùÓÐËØÊýµÄƽ·½¸ùÖ®ºÍ¡£ ÀýÈ磺¼üÅ̸ønÊäÈë100ºó£¬Êä³öΪ£ºsum=148.874270¡£ £¨3£©¹¦ÄÜ£ºÊä³öFibonacciÊýÁÐÖдóÓÚsµÄ×îСµÄÒ»¸öÊý¡£ÆäÖÐFibonacciÊýÁÐF(n)µÄ¶¨ÒåΪ£º F(0)=0£¬F(1)=1 F(n)=F(n-1)+F(n-2) ÀýÈ磺¼üÅÌÊäÈës=1000ʱ£¬Êä³ö1597¡£ ³ÌÐòÇåµ¥¼°Á÷³Ìͼ£º£¨³ÌÐòÌ⣩ 1. ±à³ÌʵÏÖʹʵÐÍÕýÊý±£Áô2λСÊý£¬²¢¶ÔµÚÈýλ½øÐÐËÄÉáÎåÈë ÀýÈ磺ʵÐÍÊýΪ 1234.567£¬Ôòº¯Êý·µ»Ø 1234.570000£» ʵÐÍÊýΪ 1234.564£¬Ôòº¯Êý·µ»Ø 1234.560000¡£ #include float x ; int y,d1; printf(\ÇëÊäÈëÒ»¸öÕýʵÐÍÊýX=\ scanf (\ y = (int)(x * 1000); d1 = y; y=y/10; if(d1 >= 5) { y=y+1; } else { y=y; } printf(\ËÄÉáÎåÈëºóµÄÊýÊÇy=%f\\n\} 2.´Ó¼üÅÌÊäÈëÒ»¸ö´óд×Öĸ£¬ÒªÇó¸ÄÓÃСд×ÖĸÊä³ö #include char X,Y; printf(\ÊäÈëÒ»¸ö´óд×Öĸ£º\ scanf(\ Y = X + 32; printf(\Êä³öµÄСд×ÖĸÊÇ£º%c\\n\} 3.±àдº¯Êý¼ÆËãÏÂÁзֶκ¯ÊýµÄÖµ£º #include int x,y; scanf(\ if(x<0 && x!=-3) { y = x*x + x + 6; printf(\Êä³öµÄ½á¹ûÊÇ y=%d\\n\ } else if(x>=0 && x<10 && x!=2 && x!=3) { y=x*x - 5*x +6; printf(\Êä³öµÄ½á¹ûÊÇ y=%d\\n\ }else { y = x*x - x - 1; printf(\Êä³öµÄ½á¹ûÊÇ y=%d\\n\ } } ¹¦ÄÜ£ºÅжÏÕûÊýxÊÇ·ñÊÇͬ¹¹Êý¡£ÈôÊÇͬ¹¹Êý£¬º¯Êý·µ»Ø1£»·ñÔò·µ»Ø0¡£xµÄÖµÓÉÖ÷º¯Êý´Ó¼üÅ̶ÁÈ룬ҪÇó²»´óÓÚ100¡£ ˵Ã÷£ºËùν¡°Í¬¹¹Êý¡±ÊÇÖ¸ÕâÑùµÄÊý£¬Õâ¸öÊý³öÏÖÔÚËüµÄƽ·½ÊýµÄÓұߡ£ ÀýÈ磺ÊäÈëÕûÊý5£¬5µÄƽ·½ÊýÊÇ25£¬5ÊÇ25ÖÐÓÒ²àµÄÊý£¬ËùÒÔ5ÊÇͬ¹¹Êý¡£ main() {