C语言解方程

本⼈热衷于数据库技术及算法的研究，志同道合之⼠， 欢迎探讨

#include#includemain(){

code_fun();}

code_fun()

{long int code=123,accept_code,j;for(j=0;j<3;j++) {

printf(\"Qing shu ru mi ma:\"); scanf(\"%ld\",&accept_code); if(j<2) {

if(code==accept_code) {clrscr();menu();break;} else

{clrscr();printf(\"Mi ma cuo wu!Ni hai you %d ji hui.\\n\\n\",2-j);} } else {

printf(\"\\nDui bu qi,Ni yi jing shu ru cuo wu 3 ci,An ren yi jian tui chu.\\n\"); getch(); tui_chu(); } }}tui_chu(){}menu(){

int variable_1;

printf(\"\\n\\n\\n\\n\\n\\n\\n 1: Duo yuan yi ci fang cheng zu.\\n\");printf(\" 2: Yi yuan er ci fang cheng.\\n\");printf(\" 3: Yi yuan gao ci fang cheng.\\n\");printf(\" 4: Jin zhi zhuan huan.\\n\");printf(\" 5: Lian xi wo.\\n\");printf(\" 6: Tui chu.\\n\");printf(\" Qing shu ru:\");scanf(\"%d\",&variable_1); if(variable_1>0&&variable_1<7) {

{

switch(variable_1) {

case 1:duo_yuan_yi_ci();break; case 2:yi_yuan_er_ci();break; case 3:yi_yuan_gao_ci();break; case 4:jin_zhi_zhuan_huan();break; case 5:contact_me();break; case 6:break; } } else { clrscr();

printf(\"Shu ru cuo wu,Qing chong xin shu ru.\"); menu(); }}

duo_yuan_yi_ci()/*属于menu()*/ {

int variable_2; clrscr();

printf(\"\\n\\n\\n\\n\\n\\n\\n 1: Er yuan yi ci.\\n\"); printf(\" 2: San yuan yi ci.\\n\"); printf(\" 3: Si yuan yi ci.\\n\"); printf(\" 4: Hui zhu cai dan.\\n\"); printf(\" Qing shu ru:\"); scanf(\"%d\",&variable_2); switch(variable_2) {

case 1:er_yuan_yi_ci();break; case 2:san_yuan_yi_ci();break; case 3:si_yuan_yi_ci();break; case 4:{clrscr();menu();} } }

er_yuan_yi_ci()/*属于duo_yuan_yi_ci()*/ {float a1,b1,c1,a2,b2,c2; clrscr();

printf(\"Fang cheng mo shi wei: a1*x+b1*y=c1\\n\"); printf(\" a2*x+b2*y=c2\\n\"); printf(\"\\n\\nQing shu ru a1:\"); scanf(\"%f\",&a1); printf(\"Qing shu ru b1:\"); scanf(\"%f\",&b1); printf(\"Qing shu ru c1:\"); scanf(\"%f\",&c1); printf(\"\\n\");

printf(\"Qing shu ru a2:\"); scanf(\"%f\",&a2); printf(\"Qing shu ru b2:\"); scanf(\"%f\",&b2); printf(\"Qing shu ru c2:\"); scanf(\"%f\",&c2); if(a1/a2!=b1/b2) {

printf(\"\\n\");

printf(\"x=%f\\n\",-((b1*c2-b2*c1)/(a1*b2-a2*b1))); printf(\"y=%f\\n\",(a1*c2-a2*c1)/(a1*b2-a2*b1));

printf(\"y=%f\\n\",(a1*c2-a2*c1)/(a1*b2-a2*b1)); } else {

printf(\"\\n\");

printf(\"a1/a2=b1/b2,fang cheng wu li.\"); }

printf(\"\\n\");

printf(\"Fang cheng wu li,An ren yi jian hui zhu cai dan.\"); getch(); clrscr(); menu(); }

san_yuan_yi_ci()/*属于duo_yuan_yi_ci()*/ {

float a1,b1,c1,d1, a2,b2,c2,d2, a3,b3,c3,d3, x,y,z; clrscr(); /*标注模式*/

printf(\"Fang cheng mo shi wei:a1*x+b1*y+c1*z=d1\\n\"); printf(\" a2*x+b2*y+c2*z=d2\\n\"); printf(\" a3*x+b3*y+c3*z=d3\\n\"); printf(\"Qing shu ru a1:\"); scanf(\"%f\",&a1); printf(\"Qing shu ru b1:\"); scanf(\"%f\",&b1); printf(\"Qing shu ru c1:\"); scanf(\"%f\",&c1); printf(\"Qing shu ru d1:\"); scanf(\"%f\",&d1);printf(\"\\n\"); printf(\"Qing shu ru a2:\"); scanf(\"%f\",&a2); printf(\"Qing shu ru b2:\"); scanf(\"%f\",&b2); printf(\"Qing shu ru c2:\"); scanf(\"%f\",&c2); printf(\"Qing shu ru d2:\"); scanf(\"%f\",&d2);printf(\"\\n\"); printf(\"Qing shu ru a3:\"); scanf(\"%f\",&a3); printf(\"Qing shu ru b3:\"); scanf(\"%f\",&b3); printf(\"Qing shu ru c3:\"); scanf(\"%f\",&c3); printf(\"Qing shu ru d3:\"); scanf(\"%f\",&d3);printf(\"\\n\");

y=((d1*a2-d2*a1)*(c3*a2-c2*a3)-(d3*a2-d2*a3)*(c1*a2-c2*a1))/((b1*a2-b2*a1)*(c3*a2-c2*a3)-(b3*a2-b2*a3)*(c1*a2-c2*a1)); z=((d1*a2-d2*a1)*(b2*a3-b3*a2)-(d2*a3-d3*a2)*(b1*a2-b2*a1))/((c1*a2-c2*a1)*(b2*a3-b3*a2)-(c2*a3-c3*a2)*(b1*a2-b2*a1)); x=(d1-c1*z-b1*y)/a1; printf(\"x=%f\\n\",x); printf(\"y=%f\\n\",y); printf(\"z=%f\\n\",z);

printf(\"An ren yi jian hui zhu cai dan.\"); getch(); clrscr(); menu(); }

si_yuan_yi_ci()/*属于duo_yuan_yi_ci()*/ {

{

float a1=1,b1=1,c1=1,d1=1,e1=10, a2=1,b2=2,c2=1,d2=1,e2=12, a3=1,b3=1,c3=2,d3=1,e3=13, a4=1,b4=1,c4=1,d4=2,e4=14, x,y,z,w, jian_ce_1,jian_ce_2;

jian_ce_1=(((e1*d2-e2*d1)*(a2*d3-a3*d2)-(e2*d3-e3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((e2*d3-e3*d2)*(a3*d4-a4*d3)-(e3*d4-e4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)));

jian_ce_2=(((c1*d2-c2*d1)*(a2*d3-a3*d2)-(c2*d3-c3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((c2*d3-c3*d2)*(a3*d4-a4*d3)-(c3*d4-c4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1))); printf(\"%f,%f\",jian_ce_1,jian_ce_2); getch();

z=(((e1*d2-e2*d1)*(a2*d3-a3*d2)-(e2*d3-e3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((e2*d3-e3*d2)*(a3*d4-a4*d3)-(e3*d4-e4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)))/(((c1*d2-c2*d1)*(a2*d3-a3*d2)-(c2*d3-c3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((c2*d3-c3*d2)*(a3*d4-a4*d3)-(c3*d4-c4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1))); printf(\"%f\",z); getch(); }

yi_yuan_er_ci()/*属于menu*/{

float a,b,c,d,x1,x2;/*d设计为判别式*/clrscr();

printf(\"Fang cheng mo shi wei: a*x*x+b*x+c=0\\n\");printf(\"\\n\\nQing shu ru a:\");scanf(\"%f\",&a);printf(\"Qing shu ru b:\");scanf(\"%f\",&b);printf(\"Qing shu ru c:\");scanf(\"%f\",&c);d=b*b-4*a*c;printf(\"\\n\");

printf(\"\\nfen xi jie guo wei:\");if(d==0)/*注意：C⾥⾯的等号为“==”*/ {printf(\"\\n\\nx1=x2=%f\\n\",(-b)/(2*a)); printf(\"zhong zhou wei: x=%f\\n\",(-b)/(2*a));

printf(\"ding dian wei:(%f,%f)\\n\",(-b)/(2*a),(4*a*c-b*b)/(4*a));}else if(d>0)

{printf(\"\\n\\nx1=%f\\nx2=%f\\n\",((-b)+sqrt(d))/(2*a),((-b)-sqrt(d))/(2*a)); printf(\"zhong zhou wei: x=%f\\n\",(-b)/(2*a));

printf(\"ding dian wei:(%f,%f)\\n\",(-b)/(2*a),(4*a*c-b*b)/(4*a));}else

{printf(\"\\n\\nfang cheng wu shi gen.\\n\"); printf(\"zhong zhou wei: x=%f\\n\",(-b)/(2*a));

printf(\"ding dian wei:(%f, %f)\\n\",(-b)/(2*a),(4*a*c-b*b)/(4*a));}printf(\"Press any key to back menu.\");getch();clrscr();menu();}

yi_yuan_gao_ci() {

int veriable_9; clrscr();

printf(\"\\n\\n\\n\\n\\n\\n\\n\");

printf(\" 1.yi yuan san ci.\\n\"); printf(\" 2.yi yuan si ci.\\n\"); printf(\" 3.Back menu.\\n\"); printf(\" Qing shu ru:\"); scanf(\"%d\",&veriable_9); if(veriable_9>0&&veriable_9<4) {

switch(veriable_9) {

case 1:yi_yuan_san_ci();break; case 2:yi_yuan_si_ci();break;

case 2:yi_yuan_si_ci();break; case 3:{clrscr();menu();}break; } } else {

printf(\"shu ru cuo wu,an ren yi jian chong xin xuan ze.\"); getch(); clrscr();

yi_yuan_gao_ci(); } }

float f(float a9,float b9,float c9,float d9, float x)/*属于yi_yuan_gao_ci()*/ { float y;

y=a9*x*x*x+b9*x*x+c9*x+d9; return(y); }

yi_yuan_san_ci()/*属于menu()*/ {

float x1,x2,x3,a8,b8,c8,d8; clrscr();

printf(\"fang cheng mo shi wei:a*x*x*x+b*x*x+c*x+d=0\\n\"); printf(\"qing shu ru a: \"); scanf(\"%f\",&a8); printf(\"qing shu ru b: \"); scanf(\"%f\",&b8); printf(\"qing shu ru c: \"); scanf(\"%f\",&c8); printf(\"qing shu ru d: \"); scanf(\"%f\",&d8);

printf(\"Please input an area that include one root(like 1,2):\"); scanf(\"%f,%f\",&x1,&x2);

if(f(a8,b8,c8,d8,x1)*f(a8,b8,c8,d8,x2)>0)

{printf(\"yi xia shi bu neng dei dao gen de san zhong ke neng de qing kuang:\\n\"); printf(\"1.shu ru de qu jian bu bao han gen.\\n\");

printf(\"2.shu ru de qu jian bao han liang ge yi shang de gen.\\n\"); printf(\"3.zai shu ru de qu jian shang qu xian yu x zhou xiang qie.\\n\"); printf(\"Press any key to input again.\"); getch();

yi_yuan_gao_ci();} else { do {

x3=(x1+x2)/2;

if(f(a8,b8,c8,d8,x3)*f(a8,b8,c8,d8,x1)>0) x1=x3; else x2=x3; }

while(fabs(f(a8,b8,c8,d8,x3))>=0.000001);/*注意写头⽂件“#include”*/ printf(\"yi ge gen shi: %f\",x3); printf(\"\\n\");

printf(\"An ren yi jian hui zhu cai dan.\"); getch(); clrscr(); menu();

menu(); } }

float f1(float a,float b,float c,float d,float e, float x)/*属于yi_yuan_gao_ci()*/ { float y;

y=a*x*x*x*x+b*x*x*x+c*x*x+d*x+e; return(y); }

yi_yuan_si_ci()/*属于menu()*/ {

float x1,x2,x3,a,b,c,d,e; clrscr();

printf(\"fang cheng mo shi wei:a*x*x*x*x+b*x*x*x+c*x*x+d*x+e=0\\n\"); printf(\"qing shu ru a: \"); scanf(\"%f\",&a); printf(\"qing shu ru b: \"); scanf(\"%f\",&b); printf(\"qing shu ru c: \"); scanf(\"%f\",&c); printf(\"qing shu ru d: \"); scanf(\"%f\",&d); printf(\"qing shu ru e: \"); scanf(\"%f\",&e);

printf(\"Please input an area that include one root(like 1,2):\"); scanf(\"%f,%f\",&x1,&x2);

if(f1(a,b,c,d,e,x1)*f1(a,b,c,d,e,x2)>0)

{printf(\"yi xia shi bu neng dei dao gen de san zhong ke neng de qing kuang:\\n\"); printf(\"1.shu ru de qu jian bu bao han gen.\\n\");

printf(\"2.shu ru de qu jian bao han liang ge yi shang de gen.\\n\"); printf(\"3.zai shu ru de qu jian shang qu xian yu x zhou xiang qie.\\n\"); printf(\"Press any key to input again.\"); getch();

yi_yuan_gao_ci();} else { do {

x3=(x1+x2)/2;

if(f1(a,b,c,d,e,x3)*f1(a,b,c,d,e,x1)>0) x1=x3; else x2=x3; }

while(fabs(f1(a,b,c,d,e,x3))>=0.0000001);/*注意写头⽂件“#include”*/ printf(\"one root is %f\",x3); printf(\"\\n\");

printf(\"Press any key to back menu.\"); getch(); clrscr(); menu(); } }

/*任意进制到⼗进制*/unsigned long fun1(){

{

unsigned long s=0;/*yjz=yuan jin zhi的⾸字母,即是原来的数是多少进制*/int i,yjz,veriable_3,a[8];

printf(\"Qing shu ru yao zhuan huan de shu de jin zhi:\\n\");scanf(\"%d\",&yjz);/*注意地址引⽤符&*/if(yjz>1&&yjz<11){

printf(\"Qing shu ru ni de shu ju de 8 wei xing shi\\n\");for(i=0;i<=7;i++)

{printf(\"di %d wei: \",8-i); scanf(\"%d\",&a[i]); }

for(i=0;i<=7;i++)

s=s+a[i]*(unsigned long)pow(yjz,7-i);return(s);}else{

printf(\"Bao qian,zhi neng zai 2-10 jin zhi zhi jian jin xing zhuan huan.\\n\\n\");printf(\"Press any key to continue.\");getch();clrscr();fun1();}}

/*⼗进制到任意进制*/void fun2(unsigned long m)

{int i,ys[8],hjz;/*ys=yu shu,hjz=hou mian de jin zhi*/printf(\"qing shu ru yao dei dao de jin zhi:\\n\");scanf(\"%d\",&hjz);for(i=0;i<=7;i++) {

ys[i]=m%hjz; m=m/hjz; }

for (i=7;i>=0;i--) printf(\"%2d\",ys[i]);}

/*⼦主函数*/

jin_zhi_zhuan_huan()/*仅限于正数*/{unsigned long sj;/*sj=shi jin zhi*/clrscr();sj=fun1();

printf(\"shi jin zhi wei:%ld\\n\",sj);fun2(sj);

printf(\"\\nPress any key to back menu.\");getch();clrscr();menu();}

contact_me(){clrscr();

printf(\"E-mail:t39q@163.com\\n\");printf(\"\\n\");

printf(\" QQ:407-959-978\\n\");printf(\"\\n\");

printf(\"An ren yi jian hui zhu cai dan.\");getch();clrscr();menu();}