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scanf(%f%f%f¡±,&a,&b,&c); if (¡¾1¡¿)

if (¡¾2¡¿) printf(¡±no answer due to input error\\n¡±); else printf(¡±the single root is %f\\n¡±, - c/b); else

{ disc=b*b-4*a*c; w=2*a;

term1= -b/w;

t=abs(disc); term2=sqrt(t)/w; if (¡¾3¡¿)

printf(¡±complex root\\n real part=%f imag part =%f\\n¡±, term1,term2);

else

printf(¡±real roots\\n root1=%f root2=%f\\n¡±, term1+term2,term1-term2);

} }

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Èô¿ÉÒÔÔòÊä³öËüµÄÃæ»ýºÍÈý½ÇÐεÄÀàÐÍ¡£ÇëÔÚ¡¾¡¿ÄÚÌîÈëÕýÈ·ÄÚÈÝ¡£

#include ¡±math.h¡± #include ¡±stdio.h¡± main() {

float a,b,c,s,area;

printf(¡±please input three edges of a triangle:¡±); scanf(¡±%f%f%f¡±,&a,&b,&c);

if (¡¾1¡¿)

{ s=(a+b+c)/2;

area=sqrt(s*(s-A*(s-B*(s-c));

printf(¡±\\nthe area of the triangle is: %f¡±,area); if ((a==b)&&(b==c))

printf(¡±µÈ±ßÈý½ÇÐΡ±); else if (¡¾2¡¿)

printf(¡±µÈÑüÈý½ÇÐΡ±): else if (¡¾3¡¿)

printf(¡±Ö±½ÇÈý½ÇÐΡ±):

else printf(¡±Ò»°ãÈý½ÇÐΡ±): }

else printf(¡±²»ÄÜ×é³ÉÈý½ÇÐΡ±)£»

}

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#include ¡±stdio.h¡± main() {

int year, flag;

printf(¡±please input the year to jude whether year:¡±);

scanf(¡±%d¡±,&year);

if (year@0==0) flag=1; else if (¡¾1¡¿) flag=1; else ¡¾2¡¿;

if (flag) printf(¡±%d is a leap year\\n¡±,year); else printf(¡±%d is not a leap year!\\n¡±,year); }

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#include ¡±stdio.h¡± main()

it is a leap

{

char ch;

printf(¡±please input a letter:¡±); scanf(¡±%c¡±,&ch); if (¡¾1¡¿) ch=ch+32;

else if (ch>=¡¯a¡¯ && ch<=¡¯z¡¯) ¡¾2¡¿;

printf(¡± the converted letter is: %c\\n¡±,ch); }

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Öµ¡£ÇëÔÚ¡¾¡¿ÄÚÌîÈëÕýÈ·ÄÚÈÝ¡£ #include ¡±stdio.h¡± main() {

int a,b,c,min;

printf(¡±please input three numbers:¡±); scanf(¡±%d%d%d¡±,&a,&b,&c); if (¡¾1¡¿) min=b; else

min=a; if (min>c)

¡¾2¡¿;

printf(¡±min=%d\\n¡±,min); } 16£®ÒÔϳÌÐòʵÏÖÕâÑùµÄ¹¦ÄÜ£ºÉ̵êÂôÎ÷¹Ï£¬10½ïÒÔÉϵÄÿ½ï0.15

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#include ¡±stdio.h¡± main() {

float weight, money, rate;

printf(¡±the paid money of the client is:¡±); scanf(¡±%f¡±,&money);

printf(¡±the weight of the watermelon is:¡±); scanf(¡±%f¡±,&weight); if (¡¾1¡¿)

rate=0.15; else if (weight>8) rate=0.3; else if (weight>6) ¡¾2¡¿; else if (weight>4)

rate=0.6;

¡¾3¡¿

rate=0.8;

printf(¡±the account payable of the watermelon is %f\\n¡±,

weight*rate);

printf(¡±the change for client is %f\\n¡±,money-weight*rate); }

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#include ¡±stdio.h¡± main() {

char ch1=¡¯a¡¯,ch2=¡¯A¡¯; switch (ch1) { case ¡¯a¡¯:

switch (ch2)

{case ¡¯A¡¯: printf(¡±good!\\n¡±); break;

case ¡¯B¡¯: printf(¡±bad!\\n¡±); break; }

case ¡¯b¡¯: printf(¡±joke\\n¡±); } }

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ÇëÔÚ¡¾¡¿ÄÚÌîÈëÕýÈ·ÄÚÈÝ¡£

x y x<0 0 0<=x<1x 0 10<=x<10 20 20<=x<-0.5x+240 0 #include ¡±stdio.h¡± main() {

int x, rate;

float y;

printf(¡±please input the value of x:¡±); scanf(¡±%d¡±,&x); if (¡¾1¡¿) rate= -1; else rate=¡¾2¡¿; switch(rate)

{ case ¨C1: y=0; break;

case 0: y=x; break; case 1: y=10; break; case 2:

case 3: y=-0.5*x+20; break; default: y= -2;