c语言系统功能模块图,救命啊，这个程序的系统的主控模块流程图和主要模块流程图是什么？...

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#include

#include

#include

struct node{

char data;

struct node *next;

};

struct node *createfromheada(float *a,char i);

struct node *createfromheadb(float *b,char j);

void fnDisplay( struct node *head );/*输出单链表head每个结点*/

void main( void )

{

struct node *head1,*head2;

float x1,x2,*a,*b;

char i,j;

a=&x1;b=&x2;

printf("The first number is '+' or '-':nThe second number is '+' or '-':n");

scanf("%c,%c",&i,&j);

printf("nPlease input the first number x1(End by '$'):n");

head1=createfromheada(a,i);

fnDisplay( head1 );

printf("n");

printf("nPlease input the second number x2(End by '$'):n");

head2=createfromheadb(b,j);

fnDisplay( head2 );

printf("n");

printf("nx1+x2=%fn",x1+x2);

printf("nx1-x2=%fn",x1-x2);

printf("nx1*x2=%fn",x1*x2);

printf("nx1/x2=%fn",x1/x2);

getch();

}

void fnDisplay( struct node *head )

{

struct node *p;

p = head;

while(p!=NULL){

printf("%c", p->data);

p = p->next;

}

}

struct node *createfromheada(float *a,char i)

{

struct node *head,*s;

char c;

int flag=1,d=1;

float N=0;

head=(struct node *)malloc(sizeof(struct node));

head->data=i;

head->next=NULL;

while(flag==1)

{

c=getchar();

if(c!='$')

{

if(c-'0'<=0)

continue;

s=(struct node *)malloc(sizeof(struct node));

s->data=c;

N=N*d+(c-'0');