c语言cls为什么没起作用,求解为什么我的程序，不能完成清屏操作就是这个system(cls)...

该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

#include

#include

#include

#include

#include

#define ESC 27

#define UP 72

#define DOWN 80

#define ENTER 13

int cursor&＃61;0;

float area_1(float b1,float b2,float jd);

float area_2(float a,float b,float c);

float area_3(float d,float h);

void mymenu(int cur);

void keyscan(void);

void exec(void);

void sanbian(void);

void liangbianhejiao(void);

void dihegao(void);

void gotoxy(int x,int y)

{

COORD c&＃61;{x,y};

SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), c);

}

float area_1(float b1,float b2,float jd)

{

return 0.5*b1*b2*sin(jd*1/180*3.14);

}

float area_2(float a,float b,float c)

{

float s;

s&＃61;0.5*(a&＃43;b&＃43;c);

return sqrt(s*(s-a)*(s-b)*(s-c));

}

float area_3(float d,float h)

{

return 0.5*d*h;

}

void mymenu(int cur)

{

static int flag&＃61;1;

if(flag&＃61;&＃61;1)

{

gotoxy(28,1);

printf("三角形面积计算程序&＃xff0c;请选择&＃xff1a;");

gotoxy(30,2);

printf("1.已知三边长计算面积");

gotoxy(30,3);

printf("2.已知两边长和夹角计算面积");

gotoxy(30,4);

printf("3.已知底边和高计算面积");

gotoxy(30,5);

printf("4.退出程序");

flag&＃61;0;

}

switch(cur)

{

case 0:

gotoxy(30,2);

break;

case 1:

gotoxy(30,3);

break;

case 2:

gotoxy(30,4);

break;

case 3:

gotoxy(30,5);

break;

}

}

void main(void)

{

system("cls");

while(1)

{

mymenu(cursor);

keyscan();

}

}

void keyscan(void)

{

unsigned char c1;

if(kbhit())

{

c1&＃61;getch();

switch(c1)

{

case UP:

if(cursor&＃61;&＃61;0)

cursor&＃61;3;

else

cursor--;

break;

case DOWN:

if(cursor&＃61;&＃61;3)

cursor&＃61;0;

else

cursor&＃43;&＃43;;

break;

case ENTER:

exec();

break;

}

}

}

void exec(void)

{

switch(cursor)

{

case 0:

sanbian();

break;

case 1:

liangbianhejiao();

break;

case 2:

dihegao();

break;

case 3:

exit(0);

break;

}

}

void sanbian(void)

{

float a,b,c;

gotoxy(30,7);

printf("请输入三边长");

scanf("%f%f%f",&a,&b,&c);

gotoxy(30,9);

if(a&＃43;b>c&&a&＃43;c>b&&b&＃43;c>a)

printf("面积是&＃xff1a;%f",area_2(a,b,c));

else

printf("无法构成三角形");

}

void liangbianhejiao(void)

{

float a,b,C;

gotoxy(30,7);

printf("请输入两边a,b&＃xff1a;");

scanf("%f%f", &a,&b);

gotoxy(30,9);

printf("请输入夹角&＃xff1a;");

scanf("%f", &C);

gotoxy(30,11);

printf("面积是&＃xff1a;%f",area_1(a,b,C));

}

void dihegao(void)

{

float d,h;

gotoxy(30,7);

printf("请输入底和高:");

scanf("%f%f", &d,&h);

gotoxy(30,9);

printf("面积是&＃xff1a;%f",area_3(d,h));

}